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1
Mitsuoka, Hiroki, Takahiro Arima, Yusuke Ohmichi, Munekazu Naito, Makiyo Hagihara, Takashi Nakano, and Hiroyuki Ishibashi. "Analysis of the positional relationship between the left brachiocephalic vein and its surrounding vessels via computed tomography scan: A retrospective study." Phlebology: The Journal of Venous Disease 35, no. 6 (January 9, 2020): 416–23. http://dx.doi.org/10.1177/0268355519898320.
Анотація:
Objectives This study aimed to clarify the positional relationship between the left brachiocephalic vein and its surrounding vessels and to analyse the association between this positional relationship and ageing. Method Chest contrast-enhanced computed tomography was performed for 100 adults. The contact number between left brachiocephalic vein and surrounding vessels (aorta, brachiocephalic artery, left common carotid artery and left subclavian artery) was determined. The correlations of ageing with the cross-sectional areas of left brachiocephalic vein crossing brachiocephalic artery and left common carotid artery and peripheral end of left brachiocephalic vein were analysed. Results LBV was in contact with aorta in 19, brachiocephalic artery in 97, left common carotid artery in 90 and left subclavian artery in 21 patients. There were significant negative correlations of ageing with the cross-sectional areas of left brachiocephalic vein crossing brachiocephalic artery and left common carotid artery and peripheral end of left brachiocephalic vein. Conclusions Brachiocephalic artery and left common carotid artery have easy contact with left brachiocephalic vein. There was a negative relationship between the cross-sectional area of left brachiocephalic vein and age.
2
Lee, Min-Woo, Kyeung-Min Kim, Hyung-Bin Lim, Young-Joon Jo, and Jung-Yeul Kim. "Repeatability of vessel density measurements using optical coherence tomography angiography in retinal diseases." British Journal of Ophthalmology 103, no. 5 (July 4, 2018): 704–10. http://dx.doi.org/10.1136/bjophthalmol-2018-312516.
Анотація:
AimTo analyse the repeatability of vessel density (VD) measurements using optical coherence tomography angiography (OCTA) in patients with retinal diseases.MethodsTwo consecutive VD measurements using OCTA were analysed prospectively in patients with retinal diseases (diabetic macular oedema (DME), retinal vein occlusion (RVO) with macular oedema, epiretinal membrane (ERM), wet age-related macular degeneration (AMD)). The intraclass correlation coefficient (ICC), coefficient of variation (CV) and test-retest SD of VD measurements were assessed, and linear regression analyses were conducted to identify factors related to repeatability.ResultsA total of 134 eyes were analysed involving 20 eyes with DME, 44 eyes with RVO with macular oedema, 50 eyes with ERM and 20 eyes with wet AMD. The mean age was 64.9 years, and the mean best-corrected visual acuity (BCVA) was 0.24. The mean central macular thickness (CMT) was 391.6 µm, and the mean ganglion cell-inner plexiform layer (GC-IPL) thickness was 61.4 µm. In all four diseases, the ICC and CV of the full VD were 0.812 and 6.72%, respectively. Univariate analyses showed that the BCVA (B, 8.553; p=0.031), signal strength (B, −1.688; p=0.050), CMT (B, 0.019; p=0.015) and mean GC-IPL thickness (B, −0.103; p=0.001) were significant factors that affected the repeatability. Multivariate analyses of these factors showed a significant result for the GC-IPL thickness.ConclusionsMeasurements of the VD using OCTA showed relatively good repeatability for various retinal diseases. The BCVA, signal strength, CMT and GC-IPL thickness affected the repeatability, so these factors should be considered when analysing the VD.
3
Kim, S.-Y., E.-A. Park, Y.-C. Shin, S.-I. Min, W. Lee, J. Ha, S. J. Kim, and S.-K. Min. "Preoperative determination of anatomic variations of the small saphenous vein for varicose vein surgery by three-dimensional computed tomography venography." Phlebology: The Journal of Venous Disease 27, no. 5 (October 28, 2011): 235–41. http://dx.doi.org/10.1258/phleb.2011.011023.
Анотація:
Objective To define the anatomical variations of small saphenous vein (SSV) for varicose vein (VV) surgery by three-dimensional computed tomography venography (3D-CTV) and to analyse the impact of this preoperative evaluation on surgical outcomes. Methods A total of 120 consecutive limbs with SSV insufficiency having undergone VV surgery from January 2005 until December 2007 were enrolled. The medical records and images were analysed retrospectively. Results The relationship between SSV and gastrocnemial vein (GNV) were categorized into two: (a) SSV and GNV drained to popliteal vein (PV) separately (100 limbs, 87%) and (b) SSV and GNV made common channel which drained to PV (15 limbs, 13%). Saphenopopliteal junction morphology was normal (75 limbs), severe tortuosity near PV (19 limbs), ampullary ectasia (4 limbs) and duplicated drainage to PV (2 limbs). No recurrence of VV was noted. Conclusions CTV can provide thorough preoperative anatomic information of the SSV variations and reduce the recurrence of VV.
4
Purwanto, Djoko. "ANALISA JENIS LIMBAH KAYU PADA INDUSTRI PENGOLAHAN KAYU DI KALIMANTAN SELATAN." Jurnal Riset Industri Hasil Hutan 1, no. 1 (July 1, 2009): 14. http://dx.doi.org/10.24111/jrihh.v1i1.864.
Анотація:
Industri penggergajian kayu menghasilkan limbah sebesar 40,48 % volume, terdiri atas sebetan (22,32 %), potongan kayu (9,39 %) dan serbuk gergaji (8,77 %). Sedangkan limbah industri kayu lapis sebesar 54,81 % volume dengan rincian potongan dolok (3,69 %), sisa kupasan dolok (18,25 %), venir basah (8,50 %), penyusutan (3,69 %), venir kering (9,60 %), pengurangan tebal (venir kering) (1,90 %), potongan tepi kayu lapis (3,90 %), serbuk gergaji (2,2 %) dan debu kayu lapis (3,07 %). Pemanfaatan pada kedua jenis limbah tersebut antara lain sebagai bahan bakar, inti papan blok, papan blok, papan partikel, dan sambungan venir inti, atau venir belakang kayu lapis.
5
Gassel, Klein, Steger, Kellersmann, Hamelmann, Franke, and Thiede. "Chirurgische Behandlung von Protheseninfektionen; vergleichende retrospektive Analyse von 30 Fällen." Vasa 31, no. 1 (February 1, 2002): 48–55. http://dx.doi.org/10.1024/0301-1526.31.1.48.
Анотація:
Background: Graft infection after vascular prosthetic reconstruction for the treatment of peripheral arterial occlusive disease (PAOD) is a rare but severe complication with poor outcome. The options for surgical treatment are not uniformly accepted and remain controversial. Patients and methods: We retrospectively analyzed the histories of 30 patients treated for prosthetic graft infection (Szilagyi grade III) in our hospital between 1994 and 1999 to determine which forms of treatment were best suited for which types of patient. In the majority of cases the initial treatment was lower-extremity bypass surgery. The most frequent location of infection was the groin (73%). Staphylococci (13% of which were methicillin resistant) were the most common type of bacteria. The overall incidence of prosthetic infection was 2.3%. Results: After confirmation of the infection by computed tomography (CT) or white blood cell scintigraphy, one of the following 5 forms of surgical treatment was performed: 1. Removal of the infected prosthesis and its simultaneous replacement by an autologous vein bypass. 2. Bypass removal and secondary replacement by an autologous vein. 3. Extra-anatomical replacement. 4. Graft removal and primary amputation. 5. Local therapy with debridement and secondary wound healing. In some patients primary amputation after graft infection was necessary to prevent further deterioration with fulminant sepsis. The overall mortality was 17%, the amputation rate was 60%. Conclusions: The best results were achieved by early complete removal of the alloplastic material and one-step replacement by either an autologous vein or extra-anatomic bypass. This resulted in a limb salvage rate of 54% and 40% and mortality rates of 9% and 0%, respectively.
6
Machida, Kenji, and Tomoaki Oikawa. "Structure Analyses of the Wings of Anotogaster Sieboldii and Hybris Subjacens." Key Engineering Materials 345-346 (August 2007): 1237–40. http://dx.doi.org/10.4028/www.scientific.net/kem.345-346.1237.
Анотація:
The wings of a dragonfly have many complicated structures. The configuration of the costal vein of the wings of a dragonfly is different from them of other insects. So, we paid attention to the configuration of the costal vein of the wings in this study. In order to know the functions and structures of the wings of a dragonfly, several 3-D models of the wing of Anotogaster Sieboldii were created, and calculated with the 3-D finite element method. In addition, we created a 3-D model of the wing of Hybris Subjacens which has the configuration of original wing, and compared the models of Anotogaster Sieboldii and Hybris Subjacens. As a result, it was clarified that the arch configuration of the costal vein controls the bending and the torsion of the wings.
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Valentino, Joseph D., Piotr G. Rychahou, W. Conan Mustain, Victoria A. Elliott, and B. Mark Evers. "Murine portal vein catheterization to analyze liver-directed therapies." Journal of Surgical Research 185, no. 2 (December 2013): 690–96. http://dx.doi.org/10.1016/j.jss.2013.06.051.
8
Lemercier, Claire. "Analyse de réseaux et histoire de la famille : une rencontre encore à venir ?" Annales de démographie historique 109, no. 1 (2005): 7. http://dx.doi.org/10.3917/adh.109.07.
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Longest, P. W., Clement Kleinstreuer, and P. J. Andreotti. "Computational Analyses and Design Improvements of Graft-to-Vein Anastomoses." Critical Reviews in Biomedical Engineering 28, no. 1-2 (2000): 141–47. http://dx.doi.org/10.1615/critrevbiomedeng.v28.i12.240.
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Ng, T. F., and G. H. Teh. "Fractal and shape analyses of manganese dendrites on vein quartz." Bulletin of the Geological Society of Malaysia 55 (November 1, 2009): 73–79. http://dx.doi.org/10.7186/bgsm55200912.
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Andrews, A. J., A. Masliwec, W. A. Morris, L. Owsiacki, and D. York. "The silver deposits at Cobalt and Gowganda, Ontario. II: An experiment in age determinations employing radiometric and paleomagnetic measurements." Canadian Journal of Earth Sciences 23, no. 10 (October 1, 1986): 1507–18. http://dx.doi.org/10.1139/e86-144.
Анотація:
U–Pb analyses of primary baddeleyite and vein-related secondary rutile, separated from a Nipissing diabase sill at the Castle mine, Gowganda, yield ages of 2217.5 ± 1.6 and 2217.0 + 6 Ma, respectively. The data allow for the possibility that (i) the vein formed at essentially the same time as diabase intrusion, defined within the limits of the intercept age [Formula: see text], or (ii) the vein could have formed up to 8.1 Ma later than intrusion. Paleomagnetic analyses of the diabase suggest that it is part of the older (N2) phase of this widespread intrusive event. Paleomagnetic analyses of a pre-vein granite dike, intrusive into the diabase, provide a minimum time interval of 20 000 – 50 000 years separating intrusion and vein formation.40Ar–39Ar analyses of silicates obtained from ore veins in the Cobalt camp yield highly disturbed age spectra. Paleomagnetic analyses of altered wall rocks to ore veins in both the Castle mine and the Cobalt camp provide a wide range of apparent ages, inconsistent with the U–Pb data. The 40Ar–39Ar and paleomagnetic data are interpreted as indicating a prolonged history of post-vein disturbances during regional tectonism.
12
El-Sheikha, Joseph. "A multilevel regression of patient-reported outcome measures after varicose vein treatment in England." Phlebology: The Journal of Venous Disease 31, no. 6 (April 15, 2015): 421–29. http://dx.doi.org/10.1177/0268355515580233.
Анотація:
Introduction The relationship between patient and hospital characteristics and their influence on quality of life (QoL) variance following varicose vein treatment is little understood. Whilst Patient-reported outcome measures (PROMs) can record postoperative outcomes, the actual comparison of PROMs between hospitals can be misleading when the clustered nature of varicose vein care is overlooked. Multilevel models can accommodate hierarchical data and therefore can provide a more accurate reflection of the relationship between patients and hospitals when investigating postoperative outcomes. Methods A multilevel model of PROMs was developed to analyse the relationship of patient characteristics (gender, age), postoperative outcomes (complications, postoperative satisfaction, treatment success) and hospital type (operative volume and if private or NHS institution) with the change in Aberdeen Varicose Vein Score (AVVQ) six months after varicose vein treatment. Results Between April 2010 and July 2014, some 24,460 PROMs from 162 hospitals were analysed. Whilst the majority of variance in AVVQ improvement was due to patient factors, a small but statistically significant amount of variance was detected due to differences between hospitals. Multilevel regression revealed that females saw a greater improvement in AVVQ, as did those who reported greater levels of treatment success and satisfaction. Patient age, complications, intervention, readmission, hospital size and hospital type were not significantly associated with AVVQ improvement. Conclusion Although QoL is intrinsically tied to an individual, hospitals can provide a small but potentially important benefit in AVVQ improvement following vein treatment. A patient-centred approach is therefore recommended to optimise patient outcomes.
13
Carbonneau, Michel. "Modèles de formation et professionnalisation de l’enseignement : analyse critique de tendances nord-américaines." Articles 19, no. 1 (October 10, 2007): 33–57. http://dx.doi.org/10.7202/031599ar.
Анотація:
Résumé - L'enseignement nord-américain, primaire et secondaire, fait l'objet d'importantes remises en question. Dans ce contexte, sa professionnalisation est vue par plusieurs comme la meilleure façon de remédier aux faiblesses qui le caractérisent et de donner un nouvel essor à l'école. Dans la poursuite de cet objectif, l'accentuation du caractère professionnel de la formation initiale des enseignants ressort comme une condition nécessaire. Dans le cadre de cette problématique, la présente analyse examine la légitimité de ce mouve- ment de professionnalisation, critique son rapport aux modèles actuels de formation initiale et aux tendances qui émergent de cet univers et, finalement, suggère un profil de composantes pour une pratique professionnelle à venir.
14
Shaheed, Kashif, Hangang Liu, Gongping Yang, Imran Qureshi, Jie Gou, and Yilong Yin. "A Systematic Review of Finger Vein Recognition Techniques." Information 9, no. 9 (August 24, 2018): 213. http://dx.doi.org/10.3390/info9090213.
Анотація:
Biometric identification is the study of physiological and behavioral attributes of an individual to overcome security problems. Finger vein recognition is a biometric technique used to analyze finger vein patterns of persons for proper authentication. This paper presents a detailed review on finger vein recognition algorithms. Such tools include image acquisition, preprocessing, feature extraction and matching methods to extract and analyze object patterns. In addition, we list some novel findings after the critical comparative analysis of the highlighted techniques. The comparative studies indicate that the accuracy of finger vein identification methods is up to the mark.
15
Lin, Te-Yu, Yu-Guang Chen, Wen-Yen Huang, Cheng-Li Lin, Chiao-Ling Peng, Fung-Chang Sung, and Chia-Hung Kao. "Association between chronic osteomyelitis and deep-vein thrombosis." Thrombosis and Haemostasis 112, no. 09 (2014): 573–79. http://dx.doi.org/10.1160/th14-01-0012.
Анотація:
SummaryStudies on the association between chronic osteomyelitis and deep vein thrombosis (DVT) and pulmonary thromboembolism (PE) are scarce. The aim of this study was to analyse a nationwide population-based database for association between DVT or PE after a diagnosis of chronic osteomyelitis. This nationwide population-based cohort study was based on data obtained from the Taiwan National Health Insurance Database from 1998 to 2008, with a follow-up period extending to the end of 2010. We identified patients with chronic osteomyelitis using International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) codes. The patients with chronic osteomyelitis and comparison controls were selected by 1:1 matching on a propensity score. The propensity score was calculated by a logistic regression to estimate the probability of the treatment assignment given the baseline variables including age, sex, and Charlson comorbidity index score. We analysed the risks of DVT and PE by using Cox proportional hazards regression models, including sex, age, and comorbidities. In total, 24,335 chronic osteomyelitis patients and 24,335 controls were enrolled in the study. The risk of developing DVT was 2.49-fold in patients with chronic osteomyelitis compared with the comparison cohort, after adjusting for age, sex, and comorbidities. The multiplicative increased risks of DVT were also significant in patients with chronic osteomyelitis with any comorbidity. In conclusion, physicians should consider chronic osteomyelitis in their evaluation of risk factors for DVT.
16
Gao, Jiaqi, Tong Chen, Chao Jiang, Tielin Wang, Ou Huang, Xiang Zhang, and Juan Liu. "Comparative anatomical and transcriptomic analyses of the color variation of leaves in Aquilaria sinensis." PeerJ 9 (June 22, 2021): e11586. http://dx.doi.org/10.7717/peerj.11586.
Анотація:
Color variation in plant tissues is a common phenomenon accompanied with a series of biological changes. In this study, a special-phenotype Aquilaria sinensis (GS) with color variation of leaf was firstly reported, and DNA barcode sequences showed GS samples could not be discriminated clearly with the normal A. sinensis sample (NS), which suggested that the variety was not the cause of the GS formation. To reveal the characteristics of GS compared to NS, the anatomical and transcriptome sequencing studies were carried out. In microscopic observation, the leaves of golden-vein-leaf sample (LGS) and normal-vein-leaf sample (LNS) showed significant differences including the area of the included phloem in midrib and the thickness parameters of palisade and spongy tissues; the stems of golden-vein-leaf sample (SGS) and normal-vein-leaf sample (SNS) were also different in many aspects such as the area of vessels and included phloem. In addition, the structure of chloroplast was more complete in the midrib of LNS than that of LGS, and some particles suspected as virus were found through transmission electron microscope as well. Genes upregulated in LGS in contrast with LNS were mainly enriched in photosynthesis. As for stems, most of the genes upregulated in SGS compared to SNS were involved in translation and metabolism processes. The pathways about photosynthesis and chlorophyll metabolism as well as some important transcription factors may explain the molecular mechanism of the unique phenotypes of leaves and the genes related to suberin biosynthesis may result in the difference of stems. In addition, the genes about defense response especially biotic stress associated with numerous pathogenesis-related (PR) genes upregulated in LGS compared to LNS indicated that the pathogen may be the internal factor. Taken together, our results reveal the macro- and micro-phenotype variations as well as gene expression profiles between GS and NS, which could provide valuable clues for elucidating the mechanism of the color variation of Aquilaria.
17
Ilic, Marko, Aleksandar Lesic, and Marko Bumbasirevic. "Main morphological characteristics of the vascular pedicle of latissimus dorsi muscle and their relevance in operative treatment." Srpski arhiv za celokupno lekarstvo 138, no. 7-8 (2010): 449–55. http://dx.doi.org/10.2298/sarh1008449i.
Анотація:
Introduction. Considering operative treatment of various pathological conditions and traumatic injuries of extremities latissimus dorsi flap presents the most frequently used flap in reconstructive surgery. Objective. The aim of this paper was to analyze anatomical characteristics of the vascular pedicle of the latissimus dorsi muscle followed by morphometric analyzes of vascular elements. Methods. This paper was carried out in cooperation with the Institute of Anatomy of the School of Medicine, University of Belgrade. The study was based on 40 cadaver dissections followed by anatomical and morphometric analyzes. The first analysis included the determination of thoracodorsal artery (TDA) origin and its lateral and terminal branches, and the second one the observation of artery path. Furthermore the same features were analyzed on the thoracodorsal vein. During morphometric analyzes artery and vein length and diameter were recorded. Results. Our results showed that TDA always contains one lateral branch, while three other lateral branches were inconstant. In most cases TDA terminated in two branches, upper and lower, with average distance of 3.4 cm from the muscle. The mean recorded pedicle length was 9.9 cm. The average inner diameter of TDA was 1.85 mm. In further analyses the average observed thoracodorsal vein length was 10.5 cm with mean diameter of 2.93 mm. The result showed that vein origin was usually represented with two branches. Conclusion. The thoracodorsal artery is a blood vessel of considerable length and diameter which represents a great advantage in reconstructive flap surgery.
18
Nadeau, Gilles G. "Étude corrélationnelle et analyse d’item des tests SACU au Canada français." Revue des sciences de l'éducation 2, no. 2 (October 2, 2009): 107–35. http://dx.doi.org/10.7202/900020ar.
Анотація:
La recherche permet d’établir des normes comparatives sur les tests SACU pour les étudiants francophones des provinces maritimes, incluant certaines comparaisons avec les étudiants francophones du Québec et de l’Ontario. À l’aide de cette étude on mettra au point des méthodes de collectes de données pour des études à venir sur cette population en milieu scolaire et dans les institutions post-secondaires. Les tableaux I à IX donnent les fréquences et pourcentages des étudiants francophones ayant passé les tests SACU, soit par région, soit par collège ou université. Le tableau IX permet une analyse descriptive-normative; le tableau X donne les statistiques descriptives pour les quatre régions francophones du Nouveau-Brunswick. Il permet une analyse comparative. Les tableaux XI et XII présentent des sommaires sur l’analyse de la variance pour les années 70, 71 et 72. Le tableau XIII présente une comparaison entre les normes pour le Nouveau-Brunswick et les normes nationales pour 1971-1972. Les tableaux XIV et XV présentent une analyse corrélationnelle pour l’Université de Moncton. En conclusion, il faut souligner que les résultats de l’enquête doivent être regardés plutôt comme des hypothèses à vérifier.
19
Iurlo, Alessandra, Daniele Cattaneo, Umberto Gianelli, Elisa Fermo, Claudia Augello, and Agostino Cortelezzi. "Molecular analyses in the diagnosis of myeloproliferative neoplasm-related splanchnic vein thrombosis." Annals of Hematology 94, no. 5 (November 8, 2014): 881–82. http://dx.doi.org/10.1007/s00277-014-2249-z.
20
Cook, Nigel J. "Bismuth and bismuth–antimony sulphosalts from Neogene vein mineralisation, Baia Borşa area, Maramureş, Romania." Mineralogical Magazine 61, no. 406 (June 1997): 387–409. http://dx.doi.org/10.1180/minmag.1997.061.406.06.
Анотація:
AbstractSeveral complex Cu-Pb-Bi, Cu-Pb-Bi-Sb and Ag-Pb-Bi sulphosalt minerals have been identified in samples from hydrothermal vein mineralisation associated with the Toroiaga sub-volcanic body in the Baia Borşa area of Maramureş County, northwest Romania. This is the first chemically-documented report of Bi-sulphosalts in the Neogene metallogenic province around Baia Mare. The investigated samples contain abundant amounts of matildite solid solution within galena, the Cu-Pb/Bi sulphosalts aikinite, friedrichite, krupkaite, hammarite, lindströmite and gladite as well as nuffieldite and berryite. Within the Ag-Pb/Bi group, the majority of analysed grains can be regarded as members of the lillianite homologous series. Three distinct lillianite homologues were identified, which correspond to (i) phases along the lillianite-gustavite solid solution join (Pb3Bi2S6-AgPbBi3S6), (ii) phases within solid solution field of heyrovskyite, and (iii) compositions which best correspond to ‘schirmerite’, sensu Makovicky and Karup-Møller (1977b), but may represent disordered gustavite, vikingite or eskimoite. Some of the analysed lillianite homologues contain excess Cu, which may occupy interstitial sites. Furthermore, a large proportion of the lillianite homologues display significant substitution of Sb for Bi within the limits predicted by experimental investigations. Cosalite, also showing a range of compositions including Sb-rich varieties is recognised. Izoklakeite, Cu2Pb22(Sb,Bi)22S57, is an abundant phase throughout the analysed samples, its composition is in good agreement with previously published analyses, except for excess Cu and Fe beyond the limits previously reported. The description of several minerals from this new occurrence and compositional data on them, including the Sb-bearing varieties, provides valuable additional information on compositional limits in natural samples.
21
van Loon, Fredericus H. J., Hendrikus H. M. Korsten, Angelique T. M. Dierick–van Daele, and Arthur R. A. Bouwman. "The impact of the catheter to vein ratio on peripheral intravenous cannulation success, a post-hoc analyses." PLOS ONE 16, no. 5 (May 24, 2021): e0252166. http://dx.doi.org/10.1371/journal.pone.0252166.
Анотація:
Background Intravenous cannulation is usually the first procedure performed in modern healthcare, although establishing peripheral intravenous access is challenging in some patients. The impact of the ratio between venous diameter and the size of the inserted catheter (catheter to vein ratio, CVR) on the first attempt success rate can be of added value in clinical. This study tries to give insight into the consideration that must be made when selecting the target vein and the type of catheter, and proved the null hypothesis that an optimal CVR would not be associated with increased first attempt cannulation success. Methods This was a post-hoc analyses on adult patients admitted for peripheral intravenous cannulation. Intravenous cannulation was performed according to practice guidelines, by applying the traditional landmark approach. The CVR was calculated afterwards for each individual patient by dividing the external diameter of the inserted catheter by the diameter of the target vein, which was multiplied by 100%. Results In total, 610 patients were included. The median CVR was 0.39 (0.15) in patients with a successful first attempt, whereas patients with an unsuccessful first attempt had a median CVR of 0.55 (0.20) (P<0.001). The optimal cut-off point of the CVR was 0.41. First attempt cannulation was successful in 92% of patients with a CVR<0.41, whereas as those with a CVR>0.41 had a first attempt success rate of 65% (P<0.001). Conclusion This first introduction of the CVR in relation to cannulation success should be further investigated. Although, measuring the venous diameter or detection of a vein with a specific diameter prior to cannulation may increase first attempt cannulation success.
22
Fristrom, D., P. Gotwals, S. Eaton, T. B. Kornberg, M. Sturtevant, E. Bier, and J. W. Fristrom. "Blistered: a gene required for vein/intervein formation in wings of Drosophila." Development 120, no. 9 (September 1, 1994): 2661–71. http://dx.doi.org/10.1242/dev.120.9.2661.
Анотація:
We have characterized the blistered (bs) locus phenotypically, genetically and developmentally using a set of new bs alleles. Mutant defects range from wings with ectopic veins and intervein blisters to completely ballooned wings where the distinction between vein and intervein is lost. Mosaic analyses show that severe bs alleles behave largely autonomously; homozygous patches having vein-like properties. Developmental analyses were undertaken using light and electron microscopy of wild-type and bs wings as well as confocal microscopy of phalloidin- and laminin-stained preparations. bs defects were first seen early in the prepupal period with the failure of apposition of dorsal and ventral wing epithelia. Correspondingly, during definitive vein/intervein differentiation in the pupal period (18-36 hours after puparium formation), the extent of dorsal/ventral reapposition is reduced in bs wings. Regions of the wing that fail to become apposed differentiate properties of vein cells; i.e. become constricted apically and acquire a laminin-containing matrix basally. To further understand bs function, we examined genetic interactions between various bs alleles and mutants of two genes whose products have known functions in wing development. (i) rhomboid, a component of the EGF-R signalling pathway, is expressed in vein cells and is required for specification of vein cell fate. rhove mutations (lacking rhomboid in wings) suppress the excess vein formation and associated with bs. Conversely, rho expression in prepupal and pupal bs wings is expanded in the regions of increased vein formation. (ii) The integrin genes, inflated and myospheroid, are expressed in intervein cells and are required for adhesion between the dorsal and ventral wing surfaces. Loss of integrin function results in intervein blisters. Integrin mutants interact with bs mutants to increase the frequency of intervein blisters but do not typically enhance vein defects. Both developmental and genetic analyses suggest that the bs product is required during metamorphosis for the initiation of intervein development and the concomitant inhibition of vein development.
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Kertous, Mourad. "Analyse des déterminants de la demande d'eau potable en Algérie." Revue des sciences de l’eau 26, no. 3 (October 9, 2013): 193–207. http://dx.doi.org/10.7202/1018785ar.
Анотація:
Assurer une répartition optimale de la ressource en eau est l’un des défis qui attend l’Algérie pour les années à venir. Toutefois, malgré un grave déficit, l’eau en Algérie est toujours subventionnée par l’État. En effet, avec un coût de production estimé à 28,45 DA•m‑3, le prix de vente de l’eau de la première tranche est 6,30 DA•m‑3, soit une subvention de 77 %. Cette pratique est inscrite dans l’article 138 de la Loi de l’eau de 2005, qui indique que « … la tarification des services de l’eau est basée sur les principes d’équilibre financier, de solidarité sociale, d’incitation à l’économie d’eau et de protection de la qualité des ressources en eau ». Par conséquent, cette subvention engendre, à la fois, des déficits au niveau des entreprises chargées de sa gestion et renvoie un faux signal aux abonnés (qui pensent toujours qu’elle est gratuite). Ainsi, nous proposons dans ce travail une contribution pour améliorer la gestion de ce service vital à travers la connaissance des déterminants de cette demande. Pour atteindre cet objectif, nous avons estimé une fonction de demande en eau potable, sur un échantillon de 172 abonnés et sur une période de 45 trimestres, en faisant appel à des estimations en panel dynamique. Cette estimation révèle que les abonnés de la wilaya de Bejaia sont peu sensibles aux variations des prix. L’élasticité prix, à court terme, estimée avec la spécification de Nordin (1976) donne une valeur de -0,67 (soit une élasticité -0,72 sur le long terme). Classification JEL : L95, Q25, D12.
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van Gent, WB, and CHA Wittens. "Influence of perforating vein surgery in patients with venous ulceration." Phlebology: The Journal of Venous Disease 30, no. 2 (December 19, 2013): 127–32. http://dx.doi.org/10.1177/0268355513517685.
Анотація:
Objectives The exact role of perforating vein surgery is still unclear. The aim of this study is to analyze the influence of perforating vein surgery in patients with venous ulceration. Methods This study was part of a randomized controlled trial in which conservative and surgical treatment of venous ulceration was compared. It is a secondary analysis of prospectively gathered data. Ninety-seven active leg ulcers were surgically treated with a subfascial endoscopic perforating vein surgery (SEPS) procedure. Concomitant superficial venous incompetence was treated with flush saphenopopliteal ligation and/or saphenofemoral ligation and limited stripping of the great saphenous vein. All patients were also treated with ambulatory compression therapy. Ulcer healing and recurrences are described in detail. To measure the completeness of the SEPS procedure duplex ultrasonography was performed on each patient before and 6 weeks and 12 months after surgery. Also newly formed perforators after surgery were scored and their influence was analyzed. Results Analyses were performed on 94 ulcerated legs with a mean follow-up of 29 months. In all treated legs, only 45% all perforators were treated. In 55% one (29%) or more (26%) perforators were missed. Healing was not significantly influenced by the number of remaining incompetent perforating veins, but recurrence was significantly higher in patients who had incomplete SEPS procedure ( p = 0.007 log-rank). New incompetent perforating veins did not affect ulcer healing or recurrence. The plotted location of new perforators did not show a pattern. Deep vein incompetence and treatment of superficial venous incompetence had no significant influence on healing or recurrence rates in a complete or incomplete SEPS procedure. Conclusion In this series a well-performed SEPS procedure lowers the venous ulcer recurrence rate significantly, indicating the clinical importance of incompetent perforating veins in patients with an active venous ulcer.
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Rathod, Kamleshkumar G., and Ruta M. Deo. "Intracath in neonates- does size matter?" International Journal of Contemporary Pediatrics 7, no. 11 (October 21, 2020): 2194. http://dx.doi.org/10.18203/2349-3291.ijcp20204544.
Анотація:
Background: Intravenous cannulation, though a first line procedure is very challenging in new-born patients. Improving its longevity will prevent frequent resisting and complications and help the baby and doctor immensely. this study analyses parameters that are likely to affect the longevity of intravenous cannula on same. This study analyses the parameters likely to affect the longevity of intravenous cannulas and effect of gauge on the same. The objectives considered are to determine the ideal gauge of cannula for peripheral vein catheterization, evaluate the complications necessitating its removal and to find the best possible peripheral vein for such cannulation; if any.Methods: This is a hospital based prospective observational study in 500 intravenous cannulas studied from point of insertion to removal. Results were tabulated and analysed based on Chi-square test and Kaplan Meir slopes were plotted. Main outcome measure- effect of cannula site on its in-situ life.Results: Term infants showed increased life span as gauge size increased (maximum with 20 G). Pre-terms had best longevity with 22 gauge. Most common cause warranting removal of cannulas were local swelling and erythema. Prick site complications leading to serious morbidity occurred in <5%.Conclusion: Gauge 22 is best suited for iv access in neonates. Gestational age and site of cannulation are strong determinants of gauge size and longevity. Intravenous cannulas in neonatal intensive care unit (NICU) should be selected considering factors for maximum lifespan of the catheter.
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Shah, Santosh, Sumod Koirala, Saroj Pradhan, and Ashok Pradhan. "Surgical Outcomes of Varicose Veins at Universal College of Medical Sciences, Bhairahawa, Nepal." Journal of Universal College of Medical Sciences 4, no. 2 (January 25, 2018): 14–16. http://dx.doi.org/10.3126/jucms.v4i2.19085.
Анотація:
INTRODUCTION: This study was conducted to analyse the surgical outcomes of varicose vein at Universal College of Medical Sciences (UCMS), Bhairahawa. MATERIALS AND METHODS: A hospital based prospective study done at UCMS, Bhairahwa, Nepal over the period of one year, where all the patients who had lower limb varicose vein underwent surgery were analyzed. RESULTS: A total of 25 cases of varicose vein were operated at UCMS from August 2015 to July 2016. The post-operative complications like pain, wound abscess, aching, itching were minimal. CONCLUSION: Surgical treatment by SFJ ligation with stripping long and short saphenous vein is an established effective treatment of varicose vein in our center with minimal post-operative complications. Journal of Universal College of Medical Sciences (2016) Vol.04 No.02 Issue 14, page: 14-16
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LEGENDRE, V., P. SANS, S. BARREY, and B. BOUTIN. "Controverses sur la consommation de viande : enseignements d’une analyse sociologique." INRA Productions Animales 30, no. 5 (June 29, 2018): 479–86. http://dx.doi.org/10.20870/productions-animales.2017.30.5.2278.
Анотація:
La consommation de produits carnés fait l’objet de débats parfois très vifs, dans un contexte de décroissance globale des quantités ingérées par habitant. Cette contribution a pour objectif d’identifier les principales interrogations des acteurs des filières animales et celles de leurs détracteurs sur les produits carnés, et de cerner les potentiels points de débats qui peuvent en résulter. En adoptant l’approche de la sociologie pragmatiste, les acteurs impliqués dans les controverses sont repérés ainsi que les argumentaires utilisés et la façon dont ils se retrouvent dans l’espace public. Un focus particulier est porté sur la question de l’abattage des animaux et sa médiatisation, depuis la publication des premières vidéos par l’association L214 (automne 2015) jusqu’à juillet 2016. La métacontroverse sur la consommation de viande apparaît dominée par des questions liées à la production, plus qu’à la consommation ellemême. L’environnement, le bien-être animal et plus largement les modes de production font partie des questions centrales pour le grand public. Les questions nutritionnelles, bien que de plus en plus prégnantes dans le débat, sont encore souvent cantonnées à la sphère scientifique. Les questions paraissent porter principalement sur l’élevage, bien que la médiatisation de l’abattage déplace également le débat vers les maillons plus en aval. Elles traduisent l’existence de trois positions vis-à-vis de la consommation de viande (végétarienne, alternative et maintien) qui renvoient à trois cadres interprétatifs (antispéciste, paysan et industriel). L’évolution des attitudes des consommateurs et la place relative de chacune de ces trois positions constituent des facteurs susceptibles d’influencer les volumes et types de produits carnés consommés dans les années à venir.
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Inderhaug, Eivind, Carl-Henrik Schelp, Inge Glambek, and Ivar S. Kristiansen. "Cost-effectiveness analysis of five procedures for great saphenous vein reflux in a Norwegian healthcare setting or societal setting." SAGE Open Medicine 6 (January 2018): 205031211880170. http://dx.doi.org/10.1177/2050312118801709.
Анотація:
Objective: The aim of this work was to estimate cost-effectiveness of five common procedures for varicose vein surgery ( high ligation and stripping, radiofrequency ablation, endovenous laser ablation, steam vein sclerosis and cyanoacrylate glue) in a Norwegian setting from both a societal and a healthcare payer perspective. Design: Cost-effectiveness analysis using decision tree modelling. Methods: A structured literature search was conducted to estimate the clinical effectiveness and the rate of complications in the five methods. Data on costs and health-related quality of life associated with varicose vein disease were also collected. With the aid of an expert panel, a structured decision tree was developed. A 1-year perspective was modelled, and a variety of common complications were included. Monte Carlo simulation was used for probabilistic sensitivity analyses. Results: The laser ablation strategy was the most cost-effective option from a societal perspective, with an incremental cost-effectiveness ratio of €8448 compared to a no-treatment alternative, and had a 42% probability of being cost-effective using the Norwegian willingness-to-pay threshold of €59,880. From a healthcare payer perspective, however, the steam vein sclerosis strategy was the most cost-effective with an incremental cost-effectiveness ratio of €4072 compared to a no-treatment alternative, and this strategy had a 50% probability of being cost-effective. Conclusion: Results from this study did depend upon the perspective chosen for analyses. Although recent endovenous surgical procedures (including laser ablation and steam vein sclerosis) provide clinically effective treatment for advanced, symptomatic varicose vein disease, availability of high-level data is currently limiting the cost-effectiveness analyses.
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Perrin, M., and Jean-Luc Gillet. "Management of recurrent varices at the popliteal fossa after surgical treatment." Phlebology: The Journal of Venous Disease 23, no. 2 (April 2008): 64–68. http://dx.doi.org/10.1258/phleb.2007.007036.
Анотація:
Objectives To analyze prevalence, incidence mechanisms, physiopathology, investigations, treatment techniques and results of recurrent varices at the popliteal fossa after surgery. Methods Published literature was analyzed as personal experience. Results Recurrent varices after surgery at the popliteal fossa are much less frequent than at the sapheno-femoral junction because the short saphenous vein is less often the site of incompetence and treated by surgery. Precise prevalence and incidence is unknown. An analysis of recurrences at the popliteal fossa revealed three causes: Incomplete division of the sapheno-popliteal junction (SPJ) at the terminal valve, which was incompetent at the initial surgery. The persisting reflux fills tributaries still connected to the saphenous stump; Neovascularization reconnects the popliteal vein to the superficial network with new vessels, which are valveless; Because the initial diagnoses is wrong and the incompetence involves the other veins of the popliteal fossa or arises from pelvic veins, which had not been recognized. Duplex scanning (DS) should identify the various sites of reflux and give precise anatomical and haemodynamic data. Treatment methods after recurrence at the popliteal fossa are repeat surgery, sclerotherapy or pelvic vein embolization when identified as the cause. Results provided by these different methods were analysed. Conclusions At present, no randomized control has given grade 1A, 1B or 2A, 2B recommendations. We recommend that ultrasound-guided foam sclerotherapy should be the treatment of choice unless DS shows an incompetent stump at the SPJ with a gross reflux filling the venous network.
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Chambers, Brian, Jayne Chambers, Leonid Churilov, Heather Cameron, and Richard Macdonell. "Internal jugular and vertebral vein volume flow in patients with clinically isolated syndrome or mild multiple sclerosis and healthy controls: results from a prospective sonographer-blinded study." Phlebology: The Journal of Venous Disease 29, no. 8 (September 24, 2013): 528–35. http://dx.doi.org/10.1177/0268355513505505.
Анотація:
Objectives & Methods: We evaluated internal jugular vein and vertebral vein volume flow using ultrasound, in patients with clinically isolated syndrome or mild multiple sclerosis and controls, to determine whether volume flow was different between the two groups. Results: In patients and controls, internal jugular vein volume flow increased from superior to inferior segments, consistent with recruitment from collateral veins. Internal jugular vein and vertebral vein volume flow were greater on the right in supine and sitting positions. Internal jugular vein volume flow was higher in the supine posture. Vertebral vein volume flow was higher in the sitting posture. Regression analyses of cube root transformed volume flow data, adjusted for supine/sitting, right/left and internal jugular vein/vertebral vein, revealed no significant difference in volume flow in patients compared to controls. Conclusions: Our findings further refute the concept of venous obstruction as a causal factor in the pathogenesis of multiple sclerosis. Control volume flow data may provide useful normative reference values.
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Sturtevant, M. A., and E. Bier. "Analysis of the genetic hierarchy guiding wing vein development in Drosophila." Development 121, no. 3 (March 1, 1995): 785–801. http://dx.doi.org/10.1242/dev.121.3.785.
Анотація:
The Drosophila rhomboid (rho) and Egf-r genes are members of a small group of genes required for the differentiation of various specific embryonic and adult structures. During larval and early pupal development expression of rho in longitudinal vein primordia mediates the localized formation of wing veins. In this paper we investigate the genetic hierarchy guiding vein development, by testing for genetic interactions between rho alleles and a wide variety of wing vein mutations and by examining the pattern of rho expression in mutant developing wing primordia. We identify a small group of wing vein mutants that interact strongly with rho. Examination of rho expression in these and other key vein mutants reveals when vein development first becomes abnormal. Based on these data and on previous genetic analyses of vein formation we present a sequential model for establishment and differentiation of wing veins.
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Narayan, Vinayak, Amey R. Savardekar, Devi Prasad Patra, Nasser Mohammed, Jai D. Thakur, Muhammad Riaz, and Anil Nanda. "Safety profile of superior petrosal vein (the vein of Dandy) sacrifice in neurosurgical procedures: a systematic review." Neurosurgical Focus 45, no. 1 (July 2018): E3. http://dx.doi.org/10.3171/2018.4.focus18133.
Анотація:
OBJECTIVEWalter E. Dandy described for the first time the anatomical course of the superior petrosal vein (SPV) and its significance during surgery for trigeminal neuralgia. The patient’s safety after sacrifice of this vein is a challenging question, with conflicting views in current literature. The aim of this systematic review was to analyze the current surgical considerations regarding Dandy’s vein, as well as provide a concise review of the complications after its obliteration.METHODSA systematic review was performed according to Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. A thorough literature search was conducted on PubMed, Web of Science, and the Cochrane database; articles were selected systematically based on the PRISMA protocol and reviewed completely, and then relevant data were summarized and discussed.RESULTSA total of 35 publications pertaining to the SPV were included and reviewed. Although certain studies report almost negligible complications of SPV sectioning, there are reports demonstrating the deleterious effects of SPV obliteration when achieving adequate exposure in surgical pathologies like trigeminal neuralgia, vestibular schwannoma, and petroclival meningioma. The incidence of complications after SPV sacrifice (32/50 cases in the authors’ series) is 2/32 (6.2%), and that reported in various case series varies from 0.01% to 31%. It includes hemorrhagic and nonhemorrhagic venous infarction of the cerebellum, sigmoid thrombosis, cerebellar hemorrhage, midbrain and pontine infarct, intracerebral hematoma, cerebellar and brainstem edema, acute hydrocephalus, peduncular hallucinosis, hearing loss, facial nerve palsy, coma, and even death. In many studies, the difference in incidence of complications between the SPV-sacrificed group and the SPV-preserved group was significant.CONCLUSIONSThe preservation of Dandy’s vein is a neurosurgical dilemma. Literature review and experiences from large series suggest that obliterating the vein of Dandy while approaching the superior cerebellopontine angle corridor may be associated with negligible complications. However, the counterview cannot be neglected in light of some series showing an up to 30% complication rate from SPV sacrifice. This review provides the insight that although the incidence of complications due to SPV obliteration is low, they can happen, and the sequelae might be worse than the natural history of the existing pathology. Therefore, SPV preservation should be attempted to optimize patient outcome.
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Solimeno, Giovanni, and Pasquale Valitutti. "A haemodynamic concept in the management of superficial non-saphenous vein thrombosis." Phlebology: The Journal of Venous Disease 35, no. 4 (July 27, 2019): 281–87. http://dx.doi.org/10.1177/0268355519861462.
Анотація:
Objective Through the analysis of the haemodynamic model in the development of superficial non-saphenous vein thrombosis, the authors propose a therapeutic approach which is based on an ultrasound study of the superficial and perforating venous system of the lower limbs. Methods The authors propose the development of a haemodynamic model in the evolution of superficial non-saphenous vein thrombosis. They analyse three cases to highlight the importance of venous haemodynamics in the development of this condition and its possible complications, such as the progression of thrombosis in the deep vein system through the perforating veins. Results The evolution of a thrombosis in the venous network of the lower limbs from the peripheral collateral veins to the deep vein can be haemodynamically explained through this model involving the perforating vein system. Conclusions In the management and treatment of superficial non-saphenous vein thrombosis, it is essential to perform an accurate ultrasound evaluation of the superficial venous system, the deep venous system and the perforator system, according to venous haemodynamic principles. This study proposes a new model to be used in the ultrasonic management and treatment of superficial non-saphenous vein thrombosis.
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Kayawake, Hidenao, Toyofumi Fengshi Chen-Yoshikawa, Satona Tanaka, Yoshito Yamada, Yojiro Yutaka, Daisuke Nakajima, Akihiro Ohsumi, Masatsugu Hamaji, and Hiroshi Date. "Variations and surgical management of pulmonary vein in living-donor lobectomy." Interactive CardioVascular and Thoracic Surgery 30, no. 1 (October 12, 2019): 24–29. http://dx.doi.org/10.1093/icvts/ivz238.
Анотація:
Abstract OBJECTIVES In a living-donor lobectomy, the donor undergoes a right or left lower lobectomy. The surgical procedures for living-donor lobectomy are sometimes influenced by the anatomical variations of the pulmonary vein (PV). The goal of this study was to analyse the PV variations in living donors and to review the influence of these variations on the surgical procedures used. METHODS Between June 2008 and September 2018, 154 living donors underwent right or left lower lobectomy. The PV variations were analysed using 3-dimensional computed tomography (3D-CT), and the surgical management of these variations was reviewed. RESULTS Among 154 donors, 21 PV variations that could influence the surgical procedure for a right lower lobectomy were found in 19 (12.3%) donors, whereas no such variations for a left lower lobectomy were found. Detected PV variations were dorsal branch of the right upper PV (n = 12), middle PV draining into the right lower PV (n = 6) and the superior segment branch of the right lower PV draining into the right upper PV (n = 3). Among 96 donors undergoing right lower lobectomy, 9 (9.4%) donors had PV variations that could influence the surgical procedure. In 2 donors, sparing of PV branches with multiple vascular clamps was required. Pulmonary venoplasty was not required in any donor, whereas pulmonary venoplasty in recipient surgery was required in 4 recipients. There were no complications related to the surgical procedures performed on the PV. CONCLUSIONS Living-donor lobectomy was performed safely owing to the preoperative evaluation of PV on 3D-CT and the use of appropriate surgical approaches to PV.
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Tagliari, Ana Paula, Adriano Nunes Kochi, Bernardo Mastella, Rodrigo Petersen Saadi, Andres di Leoni Ferrari, Luiz Henrique Dussin, Leandro de Moura, Márcio Rodrigo Martins, Eduardo Keller Saadi, and Carisi Anne Polanczyk. "Ultrasound-guided Axillary Vein Puncture in Cardiac Lead Implantation: Time to Move to a New Standard Access?" Arrhythmia & Electrophysiology Review 9, no. 2 (August 13, 2020): 78–82. http://dx.doi.org/10.15420/aer.2020.17.
Анотація:
Cardiac stimulation therapy has evolved significantly over the past 30 years. Currently, cardiac implantable electronic devices (CIED) are the mainstream therapy for many potentially lethal heart conditions, such as advanced atrioventricular block or sustained ventricular tachycardia or fibrillation. Despite sometimes being lifesaving, the implant is surgical and therefore carries all the inevitable intrinsic risks. In the process of technology evolution, one of the most important factors is to make it safer for the patient. In the context of CIED implants, complications include accidental puncture of intrathoracic structures. Alternative strategies to intrathoracic subclavian vein puncture include cephalic vein dissection or axillary vein puncture, which can be guided by fluoroscopy, venography or, more recently, ultrasound. In this article, the authors analyse the state of the art of ultrasound-guided axillary vein puncture using evidence from landmark studies in this field.
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McFall, Katie, Stephen Roberts, Iain McDonald, Adrian J. Boyce, Jonathan Naden та Damon Teagle. "Rhenium Enrichment in the Muratdere Cu-Mo (Au-Re) Porphyry Deposit, Turkey: Evidence from Stable Isotope Analyses (δ34S, δ18O, δD) and Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry Analysis of Sulfides". Economic Geology 114, № 7 (1 листопада 2019): 1443–66. http://dx.doi.org/10.5382/econgeo.4638.
Анотація:
Abstract The Muratdere Cu-Mo (Au) porphyry deposit in western Turkey contains elevated levels of rhenium and is hosted within granodioritic intrusions into an ophiolitic mélange sequence in the Anatolian belt. The deposit contains several stages of mineralization: early microfracture-hosted molybdenite and chalcopyrite, followed by a quartz-pyrite-chalcopyrite vein set associated with Cu-Au grade, a quartz-chalcopyrite-pyrite-molybdenite vein set associated with Cu-Mo-Re grade, and a later polymetallic quartz-barite-sphalerite-galena-pyrite vein set. The rhenium in Muratdere is hosted within two generations of molybdenite: early microfracture-hosted molybdenite and later vein-hosted molybdenite. In situ laser ablation-inductively coupled plasma-mass spectrometry analysis of sulfides shows that the later molybdenite has significantly higher concentrations of Re (average 1,124 ppm, σ = 730 ppm, n = 43) than the early microfracture-hosted molybdenite (average 566 ppm, σ = 423 ppm, n = 28). Pyrite crystals associated with the Re-rich molybdenite have higher Co and As concentrations than those in other vein sets, with Au associated with As. The microfracture-hosted sulfides have δ34S values between −2.2‰ and +4.6‰, consistent with a magmatic source. The vein-hosted sulfides associated with the high-Re molybdenite have a δ34S signature of 5.6‰ to 8.8‰, similar to values found in peridotite lenses in the Anatolian belt. The later enrichment in Re and δ34S-enriched S may be sourced from the surrounding ophiolitic country rock or may be the result of changing redox conditions during deposit formation.
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Christenson, J. T. "The impact of the creation of a venous surgical centre within the department of cardiovascular surgery at a university hospital." Phlebology: The Journal of Venous Disease 22, no. 2 (April 1, 2007): 70–74. http://dx.doi.org/10.1258/026835507780346150.
Анотація:
Background: The establishment of specialty vein clinics has proven beneficial in terms of expansion of clinical volume. Depending on the local situation, the creation of a venous surgical centre may, in addition, result in better collaboration between various specialties, enable active participation in the development and evaluation of new treatment modalities, offer better training/education and provide venues for more complex treatment modalities such as reconstructive surgery of the deep venous system. Objectives: The aim of this study was to analyse the impact of the creation of a venous surgical centre under the auspices of a department of cardiovascular surgery at a university hospital. Methods: A venous surgical centre was established on 1 October 2003, under the direction of one senior surgeon. The impact on clinical activity was measured in terms of patient volume, percentage distribution between venous and arterial surgery and surgical procedures performed, complications following venous surgery as well as evaluation of patient and referring physician satisfaction. Data, from the department's databank, on all patients evaluated and surgically treated for venous and arterial problems from 1 January 2000 to 30 June 2006 were analysed. Number of outpatient clinic visits and operations (patients and surgical procedures) were calculated. Results: The establishment of the venous surgical centre, without additional funding, led to a significant increase in clinical volume. There was a 433% increase in vein surgical procedures and a 774% increase in outpatient clinic visits (comparing 2002 with 2004). Endovenous laser treatment of varicose veins and reconstructive surgery for the deep venous system was started, and a program for training surgeons was established. Complication rate following varicose vein surgery decreased from 5.8% to 1.2% (hematomas and groin infection). Patient and referring physician satisfaction was documented in 2004 and 2006 using questionnaires. Conclusions: The establishment of an academic venous surgical centre has proven useful in increasing clinical activity in terms of patient volume, providing more efficient and better continuity of care, ensuring less complications following varicose vein surgery, allowing the introduction of new treatment modalities, and resulting in overwhelming patient and treating physician satisfaction.
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Karimi, Alireza, Mahdi Navidbakhsh, Taraneh Rezaee, and Kamran Hassani. "Measurement of the circumferential mechanical properties of the umbilical vein: experimental and numerical analyses." Computer Methods in Biomechanics and Biomedical Engineering 18, no. 13 (April 29, 2014): 1418–26. http://dx.doi.org/10.1080/10255842.2014.910513.
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Ageno, Walter, Elena Rancan, Alberto Donati, Luca Galli, Alessandro Squizzato, Achille Venco, Pier Mannucci, Roberto Manfredini, and Francesco Dentali. "Seasonal and monthly variability in the incidence of venous thromboembolism." Thrombosis and Haemostasis 106, no. 09 (2011): 439–47. http://dx.doi.org/10.1160/th11-02-0116.
Анотація:
SummaryMany studies showed that the occurrence of cardiovascular and cerebrovascular events exhibits a seasonal and monthly variation. Evidences of a seasonal and monthly variation in the incidence of venous thromboembolism (VTE) are more conflicting. We conducted a systematic review and a meta-analysis of the literature to assess the presence of an infradian rhythm of this disease. MEDLINE and EMBASE databases were searched up to January 2010. Monthly and seasonal variation in the incidence of VTE were analysed. We included studies analysing seasonal or monthly aggregation in the incidence of deep-vein thrombosis (DVT) and/or pulmonary embolism (PE) with an objective diagnosis of VTE. Two authors independently reviewed and extracted data. Seventeen studies for a total of about 35,000 patients were included. Twelve studies analysed the seasonal variation and 10 studies the monthly variation of VTE. Our results showed a significantly increased incidence of VTE in winter (chi-square 146.04, p <0.001), with a relative risk (RR) of VTE of 1.143 (99% CI [1.141, 1.144]), and a significantly increased incidence of VTE in January (chi-square 232.57, p <0.001) with an RR of VTE of 1.194 (99% CI 1.186, 1.203). Subgroup analyses including only idiopathic venous thromboembolic events confirmed the results of principal analyses. In conclusion, our data support the presence of an infradian pattern in the incidence of venous thromboembolic events, with a significantly higher risk in Winter and in January. Future studies are needed to better clarify the mechanisms behind this pattern.
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Aguilar, Cristian, Francisco Socola, Jean A. Donet, Nicolas Gallastegui, and Gabriel A. Hernandez. "Leiomyosarcoma of the Splenic Vein." Clinical Medicine Insights: Oncology 7 (January 2013): CMO.S12403. http://dx.doi.org/10.4137/cmo.s12403.
Анотація:
Leiomyosarcomas arising from the wall of blood vessels are rare and aggressive neoplasm. We report a case of a previously healthy 66-year-old woman who presented with intermittent abdominal pain, progressive constipation, and weight loss. Abdominal computed tomography showed a 12 cm solid heterogeneous tumor in the tail of the pancreas. The patient subsequently underwent surgical resection of the pancreatic mass. Surprisingly, histological and immunohistochemical analyses revealed leiomyosarcoma arising from the smooth muscle of the splenic vein. After surgery, she received adjuvant chemotherapy. One year later, there was no evidence of local recurrence. In this paper, we discuss the available information about leiomyosarcomas of splenic vein and its management.
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Xu, Wenda, Xingshun Qi, Jiang Chen, Chunping Su, and Xiaozhong Guo. "Prevalence of Splanchnic Vein Thrombosis in Pancreatitis: A Systematic Review and Meta-Analysis of Observational Studies." Gastroenterology Research and Practice 2015 (2015): 1–23. http://dx.doi.org/10.1155/2015/245460.
Анотація:
Splanchnic vein thrombosis (SVT) may be negatively associated with the prognosis of pancreatitis. We performed a systematic review and meta-analysis of literatures to explore the prevalence of SVT in pancreatitis. All observational studies regarding the prevalence of SVT in pancreatitis were identified via PubMed and EMBASE databases. The prevalence of SVT was pooled in the total of patients with pancreatitis. And it was also pooled in the subgroup analyses according to the stage and causes of pancreatitis, location of SVT, and regions where the studies were performed. After the review of 714 studies, 44 studies fulfilled the inclusion criteria. Meta-analyses showed a pooled prevalence of SVT of 13.6% in pancreatitis. According to the stage of pancreatitis, the pooled prevalence of SVT was 16.6% and 11.6% in patients with acute and chronic pancreatitis, respectively. According to the causes of pancreatitis, the pooled prevalence of SVT was 12.2% and 14.6% in patients with hereditary and autoimmune pancreatitis. According to the location of SVT, the pooled prevalence of portal vein, splenic vein, and mesenteric vein thrombosis was 6.2%, 11.2%, and 2.7% in pancreatitis. The prevalence of SVT in pancreatitis was 16.9%, 11.5%, and 8.5% in Europe, America, and Asia, respectively.
42
Arnoldussen, C. W. K. P., I. Toonder, and C. H. A. Wittens. "A Novel Scoring System for Lower-extremity Venous Pathology Analysed Using Magnetic Resonance Venography and Duplex Ultrasound." Phlebology: The Journal of Venous Disease 27, no. 1_suppl (March 2012): 163–70. http://dx.doi.org/10.1258/phleb.2012.012s26.
Анотація:
Objectives: To present a novel scoring system for lower-extremity venous pathology (the LOVE score) and our experiences using it in our clinical practice to identify venous pathology with duplex ultrasound (DUS) and magnetic resonance venography (MRV). Method: A total of 40 patients, 30 suspected of chronic venous disease and 10 with acute deep vein thrombosis (DVT) were examined from the inferior vena cava (IVC) to the popliteal vein using DUS and MRV. The image findings were reported using the LOVE score. Results The majority of deep veins (368 out of 378 segments) were completely visualized by both our imaging techniques and could be analysed using the LOVE score. Both imaging techniques reported comparable findings with regard to the visualization of thrombus, obstruction, collaterals, trabeculations, anatomic variations and central venous compression (e.g. May–Thurner). Conclusions: The LOVE score can be used to expand and standardize the documentation of imaging the deep venous system beyond thrombosis, to help identify (optimal) treatment options in patients with venous disease, in both the clinical and research setting. This first assessment shows that both DUS and MRV are capable of systematically identifying a multitude of changes in the venous system.
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Roch, F., A. Baonza, E. Martin-Blanco, and A. Garcia-Bellido. "Genetic interactions and cell behaviour in blistered mutants during proliferation and differentiation of the Drosophila wing." Development 125, no. 10 (May 15, 1998): 1823–32. http://dx.doi.org/10.1242/dev.125.10.1823.
Анотація:
In this work, we analyse the blistered function in wing vein development by studying genetic mosaics of mutant cells, genetic interactions with other genes affecting vein development and blistered expression in several mutant backgrounds. blistered encodes for a nuclear protein homologous to the mammalian Serum Response Factor and is expressed in presumptive intervein cells of third larval instar and pupal wing discs. Clones of blistered mutant cells proliferate normally but tend to grow along veins and always differentiate as vein tissue. These observations indicate that vein-determined wing cells show a particular behaviour that is responsible for their allocation to vein regions. We observe strong genetic interactions between blistered, veinlet and genes of the Ras signaling cascade. During disc proliferation, blistered expression is under the control of the Ras signal transduction pathway, but its expression is independent of veinlet. During the pupal period, blistered and veinlet expression become interdependent and mutually exclusive. These results link the activity of the Ras pathway to the process of early determination of intervein cells, by the transcriptional control of the blistered nuclear factor.
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Hale, Andrew T., David P. Stonko, Li Wang, Megan K. Strother, and Lola B. Chambless. "Machine learning analyses can differentiate meningioma grade by features on magnetic resonance imaging." Neurosurgical Focus 45, no. 5 (November 2018): E4. http://dx.doi.org/10.3171/2018.8.focus18191.
Анотація:
OBJECTIVEPrognostication and surgical planning for WHO grade I versus grade II meningioma requires thoughtful decision-making based on radiographic evidence, among other factors. Although conventional statistical models such as logistic regression are useful, machine learning (ML) algorithms are often more predictive, have higher discriminative ability, and can learn from new data. The authors used conventional statistical models and an array of ML algorithms to predict atypical meningioma based on radiologist-interpreted preoperative MRI findings. The goal of this study was to compare the performance of ML algorithms to standard statistical methods when predicting meningioma grade.METHODSThe cohort included patients aged 18–65 years with WHO grade I (n = 94) and II (n = 34) meningioma in whom preoperative MRI was obtained between 1998 and 2010. A board-certified neuroradiologist, blinded to histological grade, interpreted all MR images for tumor volume, degree of peritumoral edema, presence of necrosis, tumor location, presence of a draining vein, and patient sex. The authors trained and validated several binary classifiers: k-nearest neighbors models, support vector machines, naïve Bayes classifiers, and artificial neural networks as well as logistic regression models to predict tumor grade. The area under the curve–receiver operating characteristic curve was used for comparison across and within model classes. All analyses were performed in MATLAB using a MacBook Pro.RESULTSThe authors included 6 preoperative imaging and demographic variables: tumor volume, degree of peritumoral edema, presence of necrosis, tumor location, patient sex, and presence of a draining vein to construct the models. The artificial neural networks outperformed all other ML models across the true-positive versus false-positive (receiver operating characteristic) space (area under curve = 0.8895).CONCLUSIONSML algorithms are powerful computational tools that can predict meningioma grade with great accuracy.
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Santos, Isabel Fonseca, Sónia Pereira, Euan McLeod, Anne-Laure Guillermin, and Ismini Chatzitheofilou. "Economic Analysis of Rivaroxaban for the Treatment and Long-Term Prevention of Venous Thromboembolism in Portugal." Acta Médica Portuguesa 27, no. 5 (October 30, 2014): 615. http://dx.doi.org/10.20344/amp.5257.
Анотація:
<p><strong>Introduction:</strong> Venous thromboembolism is a burden on healthcare systems. The aim of this analysis was to project the long-term costs and outcomes for rivaroxaban compared to standard of care (enoxaparin/warfarin) in Portugal for the treatment and secondary prevention of venous thromboembolism.<br /><strong>Material and Methods:</strong> A Markov model was developed using event rates extracted from the EINSTEIN trials supplemented with literature-based estimates of longer-term outcomes. Core outcomes included per patient costs and quality-adjusted life years reported separately per treatment arm and incrementally, as well as cost per quality-adjusted life years gained. The deep vein thrombosis and pulmonary embolism indications were analysed separately. The analyses were conducted from the Portuguese societal perspective and over a 5-year time horizon. Costs and outcomes were discounted at a 5% annual rate. Several scenario analyses were undertaken to explore the impact on results of varying key modeling assumptions.<br /><strong>Results:</strong> Rivaroxaban treatment was associated with cost-savings for the treatment of deep vein thrombosis and was both cost-saving and more effective for the treatment of pulmonary embolism, compared with enoxaparin/warfarin.<br /><strong>Discussion:</strong> The results of the sensitivity and scenario analyses further supported that rivaroxaban is a cost-effective alternative to standard of care treatment. The use of an expert panel to derive some input values and the lack of Portuguese specific utilities were the main limitations.<br /><strong>Conclusion:</strong> Rivaroxaban represents an efficient alternative to using enoxaparin/warfarin in Portugal, as it’s associated with lower costs (for both indications) and greater quality adjusted life years (for the pulmonary embolism indication).</p><p><br /><strong>Keywords: </strong>Venous Thrombosis; Pulmonary Embolism; Rivaroxaban; Venous Thromboembolism.</p>
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Ramachandran, Roshni, Deepak Kumar Bhatt, Kenneth Beri Ploug, Anders Hay-Schmidt, Inger Jansen-Olesen, Saurabh Gupta, and Jes Olesen. "Nitric oxide synthase, calcitonin gene-related peptide and NK-1 receptor mechanisms are involved in GTN-induced neuronal activation." Cephalalgia 34, no. 2 (September 2, 2013): 136–47. http://dx.doi.org/10.1177/0333102413502735.
Анотація:
Background and aim Infusion of glyceryltrinitrate (GTN), a nitric oxide (NO) donor, in awake, freely moving rats closely mimics a universally accepted human model of migraine and responds to sumatriptan treatment. Here we analyse the effect of nitric oxide synthase (NOS) and calcitonin gene-related peptide (CGRP) systems on the GTN-induced neuronal activation in this model. Materials and methods The femoral vein was catheterised in rats and GTN was infused (4 µg/kg/min, for 20 minutes, intravenously). Immunohistochemistry was performed to analyse Fos, nNOS and CGRP and Western blot for measuring nNOS protein expression. The effect of olcegepant, L-nitro-arginine methyl ester (L-NAME) and neurokinin (NK)-1 receptor antagonist L-733060 were analysed on Fos activation. Results GTN-treated rats showed a significant increase of nNOS and CGRP in dura mater and CGRP in the trigeminal nucleus caudalis (TNC). Upregulation of Fos was observed in TNC four hours after the infusion. This activation was inhibited by pre-treatment with olcegepant. Pre-treatment with L-NAME and L-733060 also significantly inhibited GTN induced Fos expression. Conclusion The present study indicates that blockers of CGRP, NOS and NK-1 receptors all inhibit GTN induced Fos activation. These findings also predict that pre-treatment with olcegepant may be a better option than post-treatment to study its inhibitory effect in GTN migraine models.
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Marti-Bonmati, L., E. Lonjedo, D. Mathieu, C. Coffin, C. Poyatos, and M. C. Anglade. "Tumoural portal vein thrombosis." Acta Radiologica 38, no. 5 (September 1997): 655–59. http://dx.doi.org/10.1080/02841859709172397.
Анотація:
Purpose: Intrahepatic thrombus is usually associated with either cirrhosis or hepato-cellular carcinoma (HCC). Most HCCs enhance after the administration of MnDPDP (Teslascan). Our objective was to analyze the enhancement characteristics of tumour portal vein thrombi. Material and Methods: Thrombi affecting the main or segmental portal veins (17 cases) and the suprahepatic inferior vena cava (1 case) were retrospectively selected from a series of 128 patients studied with MR imaging before and after the administration of MnDPDP. Enhancement was assessed qualitatively and quantitatively. Results: All tumour thrombi enhanced after MnDPDP administration. The enhancement was more conspicuous in the GRE images. On the quantitative evaluation, the portal thrombus enhancement was greater for GRE images than SE images. Portal thrombi enhanced more than the liver and the HCCs. There was a significant difference between the enhancement of the HCCs and the thrombi with both MR imaging techniques. Conclusion: The greater enhancement of the tumour thrombus associated with the liver and HCC may suggest that other mechanisms, apart from accumulation of the contrast medium within the hepatocytes inside the thrombi, are involved in thrombus enhancement.
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Celis de, J. F. "Expression and function of decapentaplegic and thick veins during the differentiation of the veins in the Drosophila wing." Development 124, no. 5 (March 1, 1997): 1007–18. http://dx.doi.org/10.1242/dev.124.5.1007.
Анотація:
The differentiation of the veins in the Drosophila wing involves the coordinate activities of several signal transduction pathways, including those mediated by the transmembrane receptors Torpedo and Notch. In this report, the role of the signalling molecule Decapentaplegic during vein differentiation has been analysed. It is shown that decapentaplegic is expressed in the pupal veins under the control of genes that establish vein territories in the imaginal disc. Decapentaplegic, acting through its receptor Thick veins, activates vein differentiation and restricts expression of both veinlet and the Notch-ligand Delta to the developing veins. Genetic combinations between mutations that increase or reduce Notch, veinlet and decapentaplegic activities suggest that the maintenance of the vein differentiation state during pupal development involves cross-regulatory interactions between these pathways.
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Liu, Chengwei, Xuesong Zhang, Shi Wang, Mingxun Cheng, Chuanyu Liu, Shuqing Wang, Xinhua Hu, and Qiang Zhang. "Transfected Early Growth Response Gene-1 DNA Enzyme Prevents Stenosis and Occlusion of Autogenous Vein GraftIn Vivo." BioMed Research International 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/310406.
Анотація:
The aim of this study was to detect the inhibitory action of the early growth response gene-1 DNA enzyme (EDRz) as a carrying agent by liposomes on vascular smooth muscle cell proliferation and intimal hyperplasia. An autogenous vein graft model was established. EDRz was transfected to the graft vein. The vein graft samples were obtained on each time point after surgery. The expression of the EDRz transfected in the vein graft was detected using a fluorescent microscope. Early growth response gene-1 (Egr-1) mRNA was measured using reverse transcription-PCR andin situhybridization. And the protein expression of Egr-1 was detected by using western blot and immunohistochemistry analyses. EDRz was located at the media of the vein graft from 2 to 24 h, 7 h after grafting. The Egr-1 protein was mainly located in the medial VSMCs, monocytes, and endothelium cells during the early phase of the vein graft. The degree of VSMC proliferation and thickness of intima were obviously relieved compared with the no-gene therapy group. EDRz can reduce Egr-1 expression in autogenous vein grafts, effectively restrain VSMC proliferation and intimal hyperplasia, and prevent vascular stenosis and occlusion after vein graft.
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Skajaa, Nils, Erzsébet Horváth-Puhó, Kasper Adelborg, Paolo Prandoni, Kenneth J. Rothman, and Henrik Toft Sørensen. "Venous Thromboembolism in Denmark: Seasonality in Occurrence and Mortality." TH Open 03, no. 02 (April 2019): e171-e179. http://dx.doi.org/10.1055/s-0039-1692399.
Анотація:
Background Many cardiovascular conditions exhibit seasonality in occurrence and mortality, but little is known about the seasonality of venous thromboembolism. Methods Using Danish registries, we identified all patients with deep vein thrombosis, pulmonary embolism, splanchnic vein thrombosis, cerebral vein thrombosis, and retinal vein thrombosis during 1977–2016. We tallied monthly deaths occurring within 90 days of the venous thromboembolism diagnosis. We estimated peak-to-trough ratios and timing of the peak of both diagnoses and deaths summed over all years of the study period. The departure from 1.0 of the peak-to-trough ratio measures the intensity of any seasonal pattern. Results We estimated a peak-to-trough ratio of 1.09 (95% confidence interval: 1.07–1.11) for deep vein thrombosis and 1.22 (1.19–1.24) for pulmonary embolism occurrence. The peak-to-trough ratios for splanchnic vein thrombosis, cerebral vein thrombosis, and retinal vein thrombosis occurrence were 1.10 (1.01–1.20), 1.19 (1.00–1.40), and 1.12 (1.07–1.17), respectively. The occurrence of all conditions peaked during winter or fall. In time trend analyses, the peak-to-trough ratio increased considerably for splanchnic vein thrombosis, cerebral vein thrombosis, and retinal vein thrombosis occurrence. In associated mortality, the peak-to-trough ratio for deep vein thrombosis was larger (1.15, 1.07–1.23) than that for pulmonary embolism (1.04, 1.01–1.08). Discussion Excess winter risks were modest, but more marked for pulmonary embolism occurrence than for deep vein thrombosis occurrence. The seasonal pattern intensified throughout the study period for splanchnic vein thrombosis, cerebral vein thrombosis, and retinal vein thrombosis. The winter peak in mortality following pulmonary embolism was smaller than that for deep vein thrombosis.