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Journal articles on the topic 'Dilation'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

SKEIDE, MICHAEL. "ISOMETRIC DILATIONS OF REPRESENTATIONS OF PRODUCT SYSTEMS VIA COMMUTANTS." International Journal of Mathematics 19, no. 05 (2008): 521–39. http://dx.doi.org/10.1142/s0129167x08004790.

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We construct a weak dilation of a not necessarily unital CP-semigroup to an E-semigroup acting on the adjointable operators of a Hilbert module with a unit vector. We construct the dilation in such a way that the dilating E-semigroup has a pre-assigned product system. Then, making use of the commutant of von Neumann correspondences, we apply the dilation theorem to prove that covariant representations of product systems admit isometric dilations.

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Rocourt, Dorothy, and Travis Hoover. "MINIMAL INVASIVE MANAGEMENT OF PEDIATRIC CROHN’S ANORECTAL STRICTURE, LESS IS MORE." Inflammatory Bowel Diseases 27, Supplement_1 (2021): S16. http://dx.doi.org/10.1093/ibd/izaa347.039.

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Abstract Background Anorectal stricture (ARS) is an uncommon but potentially disabling manifestation of perianal Crohn disease (CD) in pediatric patients. Various treatment options are available but there is little data regarding their efficacy, particularly in the pediatric population. We present three case reports of patients with symptomatic ARS treated with serial dilation and biologic therapy. Methods An institutional review board-approved retrospective review was performed using electronic health records. Three patients with ileocolonic CD and perianal involvement with symptomatic ARS we

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Cheng, Tsung O. "Dilation versus dilatation." American Journal of Cardiology 73, no. 5 (1994): 421. http://dx.doi.org/10.1016/0002-9149(94)90030-2.

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O’Dea, John, and Peter D. Siersema. "Esophageal dilation with integrated balloon imaging: initial evaluation in a porcine model." Therapeutic Advances in Gastroenterology 6, no. 2 (2012): 109–14. http://dx.doi.org/10.1177/1756283x12467566.

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Background: When treating achalasia, balloon dilation is often combined with fluoroscopy to allow the lower esophageal sphincter to be visualized as it is being dilated. We sought to evaluate a new balloon dilation technology, EsoFLIP, which allows the shape of the balloon to be visualized in a nonradiographic manner by using impedance planimetry electrodes located within the dilation balloon. Methods: Two pigs weighing 35 kg were used. The EsoFLIP balloon dilator was introduced under endoscopic visualization. Successive injections of 50, 60, 70 and 85 mL into the dilation balloon permitted di

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Cohen, Kenneth D., Bradley R. Berg, and Ingrid H. Sarelius. "Remote arteriolar dilations in response to muscle contraction under capillaries." American Journal of Physiology-Heart and Circulatory Physiology 278, no. 6 (2000): H1916—H1923. http://dx.doi.org/10.1152/ajpheart.2000.278.6.h1916.

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In hamster cremaster muscle, it has been shown previously that contraction of skeletal muscle fibers underlying small groups of capillaries (modules) induces dilations that are proportional to metabolic rate in the two arteriolar generations upstream of the stimulated capillaries (Berg BR, Cohen KD, and Sarelius IH. Am J Physiol Heart Circ Physiol 272: H2693–H2700, 1997). These remote dilations were hypothesized to be transmitted via gap junctions and not perivascular nerves. In the present study, halothane (0.07%) blocked dilation in the module inflow arteriole, and dilation in the second art

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Aschner, Judy L., Thuy K. Smith, Nora Kovacs, Joaquim M. B. Pinheiro, and Mamta Fuloria. "Mechanisms of bradykinin-mediated dilation in newborn piglet pulmonary conducting and resistance vessels." American Journal of Physiology-Lung Cellular and Molecular Physiology 283, no. 2 (2002): L373—L382. http://dx.doi.org/10.1152/ajplung.00032.2002.

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Bradykinin (BK) is a potent dilator of the perinatal pulmonary circulation. We investigated segmental differences in BK-induced dilation in newborn pig large conducting pulmonary artery and vein rings and in pressurized pulmonary resistance arteries (PRA). In conducting pulmonary arteries and veins, BK-induced relaxation is abolished by endothelial disruption and by inhibition of nitric oxide (NO) synthase with nitro-l-arginine (l-NA). In PRA, two-thirds of the dilation response isl-NA insensitive. Charybdotoxin plus apamin and depolarization with KCl abolish the l-NA-insensitive dilations, fi

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7

Zhang, Kechen, Martin I. Sereno, and Margaret E. Sereno. "Emergence of Position-Independent Detectors of Sense of Rotation and Dilation with Hebbian Learning: An Analysis." Neural Computation 5, no. 4 (1993): 597–612. http://dx.doi.org/10.1162/neco.1993.5.4.597.

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We previously demonstrated that it is possible to learn position-independent responses to rotation and dilation by filtering rotations and dilations with different centers through an input layer with MT-like speed and direction tuning curves and connecting them to an MST-like layer with simple Hebbian synapses (Sereno and Sereno 1991). By analyzing an idealized version of the network with broader, sinusoidal direction-tuning and linear speed-tuning, we show analytically that a Hebb rule trained with arbitrary rotation, dilation/contraction, and translation velocity fields yields units with wei

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Stoner, Patrick L., Amy L. Fullerton, Alyssa M. Freeman, Neil N. Chheda, and David S. Estores. "Endoscopic Dilation of Refractory Postlaryngectomy Strictures: A Case Series and Literature Review." Gastroenterology Research and Practice 2019 (May 28, 2019): 1–9. http://dx.doi.org/10.1155/2019/8905615.

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Background. Endoscopic dilation of postlaryngectomy strictures (PLS) is safe and effective; however, PLS are often refractory and require serial dilations. Long-term outcomes of dilation in patients with refractory PLS are not well reported. Materials and Methods. Seven patients with dysphagia and refractory PLS underwent serial endoscopic dilation therapy during a 4.5-year period. Dilation characteristics, technical success, clinical success, and diet advancement (as assessed by Diet/GT scale) were measured. Results. All strictures were complex, and there were no reported complications. The m

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9

Sullivan, Stephen N., Marie Corke, and William C. Watson. "Self Dilation of Esophageal Strictures." Canadian Journal of Gastroenterology 5, no. 2 (1991): 49–50. http://dx.doi.org/10.1155/1991/940150.

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Over 22 years, 26 patients were taught to dilate their esophageal strictures. Fifteen had peptic strictures, four malignant neoplasms, three achalasia, three dysphagia following fundoplication and one esophageal lichen planus. The patients with peptic strictures (mean age 58 years) did particularly well, repeatedly dilating themselves over an average of six years (range two months to 18 years). There were no serious complications. Self dilation is a safe, convenient and inexpensive way to manage patients who require repeated, frequent dilations for esophageal strictures.

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Phaijitwichian, Somboon. "One-shot dilation versus metallic dilation technique for access in percutaneous nephrolithotomy: comparison of efficacy, access time and fluoroscopic time." Insight Urology 42, no. 2 (2021): 154–59. http://dx.doi.org/10.52786/isu.a.38.

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Objective: The aim of this study was to compare the efficacy, access tract dilation time and fluoroscopic time between the one-shot dilation technique and telescopic metal dilatation technique in patients undergoing percutaneous nephrolithotomy in Nakornping Hospital. Materials and Methods: Sixty-six patients who underwent percutaneous nephrolithotomy from January 2020 to July 2021 were included in the study and they were randomly divided into two groups. In group 1 (32 patients), telescopic metal dilation was used, in group 2 (33 patients), the one-shot technique was used. Success rates of di

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Trott, Daniel W., John W. Seawright, Meredith J. Luttrell, and Christopher R. Woodman. "NAD(P)H oxidase-derived reactive oxygen species contribute to age-related impairments of endothelium-dependent dilation in rat soleus feed arteries." Journal of Applied Physiology 110, no. 5 (2011): 1171–80. http://dx.doi.org/10.1152/japplphysiol.01037.2010.

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We tested the hypothesis that age-related endothelial dysfunction in rat soleus muscle feed arteries (SFA) is mediated in part by NAD(P)H oxidase-derived reactive oxygen species (ROS). SFA from young (4 mo) and old (24 mo) Fischer 344 rats were isolated and cannulated for examination of vasodilator responses to flow and acetylcholine (ACh) in the absence or presence of a superoxide anion (O2−) scavenger (Tempol; 100 μM) or an NAD(P)H oxidase inhibitor (apocynin; 100 μM). In the absence of inhibitors, flow- and ACh-induced dilations were attenuated in SFA from old rats compared with young rats.

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Venteicher, Andrew, and William M. Armstead. "Vasopressin contributes to dynorphin modulation of hypoxic cerebrovasodilation." American Journal of Physiology-Heart and Circulatory Physiology 275, no. 6 (1998): H2072—H2079. http://dx.doi.org/10.1152/ajpheart.1998.275.6.h2072.

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Because pial artery dilation during a 20- or 40-min hypoxic exposure was less than that observed during a 5- or 10-min exposure, stimulus duration determines the vascular response to hypoxia. Dynorphin (Dyn) modulates hypoxic pial dilation and contributes to decremented dilation during longer hypoxic exposures. This study was designed to determine whether vasopressin (VP) contributes to Dyn modulation of hypoxic pial dilation in newborn pigs equipped with a closed cranial window. Moderate (M) and severe (S) hypoxia (arterial [Formula: see text] ∼ 35 and 25 mmHg, respectively) had no effect on

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Frisbee, Jefferson C., John M. Hollander, Robert W. Brock, Han-Gang Yu, and Matthew A. Boegehold. "Integration of skeletal muscle resistance arteriolar reactivity for perfusion responses in the metabolic syndrome." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 296, no. 6 (2009): R1771—R1782. http://dx.doi.org/10.1152/ajpregu.00096.2009.

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Previous study suggests that with evolution of the metabolic syndrome, patterns of arteriolar reactivity are profoundly altered and may constrain functional hyperemia. This study investigated interactions between parameters of vascular reactivity at two levels of resistance arterioles in obese Zucker rats (OZR), translating these observations into perfusion regulation for in situ skeletal muscle. Dilation of isolated and in situ resistance arterioles from OZR to acetylcholine, arachidonic acid (AA), and hypoxia (isolated arterioles only) were blunted vs. lean Zucker rats (LZR), although dilati

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Walter, Daisy, Maarten van den Berg, Meike Hirdes, et al. "Dilation or biodegradable stent placement for recurrent benign esophageal strictures: a randomized controlled trial." Endoscopy 50, no. 12 (2018): 1146–55. http://dx.doi.org/10.1055/a-0602-4169.

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Abstract Background Dilation is the standard of care for recurrent benign esophageal strictures (BES). Biodegradable stents may prolong the effect of dilation and reduce recurrences. Efficacy and safety of dilation and biodegradable stent placement early in the treatment algorithm of recurrent BES were compared. Methods This multicenter, randomized study enrolled patients with BES treated with previous dilations to ≥ 16 mm. The primary end point was number of repeat endoscopic dilations for recurrent stricture within 3 and 6 months. Secondary outcomes through 12 months included safety, time to

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Koneru, Padmaja, and Charles W. Leffler. "Role of cGMP in carbon monoxide-induced cerebral vasodilation in piglets." American Journal of Physiology-Heart and Circulatory Physiology 286, no. 1 (2004): H304—H309. http://dx.doi.org/10.1152/ajpheart.00810.2003.

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The hypothesis was addressed that CO-induced cerebral vasodilation requires a permissive cGMP signal that can be produced by nitric oxide (NO). Anesthetized piglets were implanted with cranial windows for measurement of pial arteriolar responses to stimuli. Pial arterioles dilated in response to isoproterenol (Iso), sodium nitroprusside (SNP), and CO or the CO-releasing molecule Mn2(CO)10 [dimanganese decacarbonyl (DMDC)]. 1 H-[1,2,4]oxadiazolo[4,3- a]quinoxalin-1-one (ODQ), a soluble guanylyl cyclase inhibitor, decreased cerebrospinal fluid (CSF) cGMP and selectively inhibited dilations to SN

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Lu, Hai Bo, and Wei Qiang Liu. "Effect of Dilation-Angle on Combustion Characteristic in Two-Phase Combustion Chamber with Dilative Entrance." Applied Mechanics and Materials 52-54 (March 2011): 806–11. http://dx.doi.org/10.4028/www.scientific.net/amm.52-54.806.

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The GO2/ethanol/water tripropellant evaporation and combustion in axisymmetric combustion chamber was numerically simulated. The different characteristics of the evaporation and combustion between dilative and traditional un-dilative entrance, and the different dilation-angles of the combustion chamber entrance are analyzed. The results indicate that the dilative entrance combustion chamber is benefit for thermal protection of the injection, and the flamelet backpedals with increase of the entrance dilation-angle. At the same time, that dilative inlet combustion chamber reduces the evaporation

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Marumo, Chinatsu, and Tamami Nakano. "Early phase of pupil dilation is mediated by the peripheral parasympathetic pathway." Journal of Neurophysiology 126, no. 6 (2021): 2130–37. http://dx.doi.org/10.1152/jn.00401.2021.

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By pharmacologically manipulating the pupil dilator and constrictor muscles of human eye separately, we found that the pupil constrictor muscle is a primary controller of rapid pupil dilation upon brain arousal. However, the pupil dilator muscle, which is innervated by the sympathetic nervous system and is generally considered as a major regulator of pupil dilation, is not involved in rapid pupil dilation, but was involved in long-lasting pupil dilation.

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Narayanan, Lavanya, Kani Shaikh Mohamed, Akilandeswari A. R., Anand A., and Arun N. "Efficacy of intralesional triamcinolone injection in the management of benign refractory esophageal strictures." International Journal of Research in Medical Sciences 10, no. 8 (2022): 1682. http://dx.doi.org/10.18203/2320-6012.ijrms20221980.

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Background: Endoscopic therapy is the mainstay in the treatment of esophageal strictures. Refractory strictures are difficult to treat with patients requiring frequent endoscopic therapy. Intralesional steroid injection combined with SG dilation has been reported to reduce the frequency of endoscopic dilation in such cases.Methods: Ten patients with benign esophageal strictures (corrosive 4, peptic 2, anastomotic 2, radiation-induced 2) were selected for this study. All of them had refractory esophageal stricture. They were being managed with intermittent endoscopic dilation by using Savary Gi

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You, J., T. D. Johnson, W. F. Childres, and R. M. Bryan. "Endothelial-mediated dilations of rat middle cerebral arteries by ATP and ADP." American Journal of Physiology-Heart and Circulatory Physiology 273, no. 3 (1997): H1472—H1477. http://dx.doi.org/10.1152/ajpheart.1997.273.3.h1472.

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The hypothesis that ATP and ADP produce dilations of rat middle cerebral arteries (MCAs) by different mechanisms was tested. Vessel diameters were measured from pressurized, perfused MCAs after application of different agonists. The luminal administration of ATP and ADP elicited concentration-dependent dilations (35% maximum). Removal of endothelium abolished the dilation to intraluminal ATP and attenuated the dilation to intraluminal ADP. The dilations to ATP were abolished with N omega-nitro-L-arginine methyl ester (L-NAME; 10 microM), a nitric oxide synthase inhibitor, at ATP concentrations

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Marrelli, Sean P., Andrei Khorovets, T. David Johnson, William F. Childres, and Robert M. Bryan. "P2 purinoceptor-mediated dilations in the rat middle cerebral artery after ischemia-reperfusion." American Journal of Physiology-Heart and Circulatory Physiology 276, no. 1 (1999): H33—H41. http://dx.doi.org/10.1152/ajpheart.1999.276.1.h33.

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Endothelial-mediated dilations to selective P2Y1 and P2Y2 purinoceptor agonists [2-methylthioadenosine triphosphate (2MeS-ATP) and uridine 5′-triphosphate (UTP), respectively] were evaluated in middle cerebral arteries (MCAs) of rats after 2 h of ischemia followed by 24 h of reperfusion (I/R). MCAs were harvested, pressurized to 85 mmHg, and luminally perfused. 2MeS-ATP, which dilates by the synthesis and release of nitric oxide (NO), had significantly reduced maximum dilations following I/R. Reduced smooth muscle sensitivity to NO may explain the reduced dilation to 2MeS-ATP. In contrast, the

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Gorshkova, O. P., and I. B. Sokolova. "H<sub>2</sub>S-Mediated Dilation of Pial Arteries in Rats of Different Ages: Contribution of K<sub>ATP </sub>and BK<sub>Ca</sub>-Channels." Российский физиологический журнал им И М Сеченова 109, no. 8 (2023): 1094–107. http://dx.doi.org/10.31857/s0869813923080034.

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Reactions of pial arteries to exogenous hydrogen sulfide exposure and assessment of the contribution of KATP and BKCa-channels to H2S-mediated dilation was studied in rats of different ages. Intravital microphotography in Sprague-Dawley rats aged 4 and 18 months was used to study the reactions of pial arteries of various diameters to the exposure of exogenous hydrogen sulfide donor solution – sodium hydrosulfide (NaHS, 30 μM), as well as their change with the preliminary use of potassium channel blockers: KATP (glibenclamide, 10 μM) and BKCa (tetraethyl ammonium, 2 mM). It was found that inhib

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Wang, Bing, Wenzhi Gao, Kunlin Yang, et al. "Analysis of the Efficacy and Risk Factors for Failure of Balloon Dilation for Benign Ureteral Stricture." Journal of Clinical Medicine 12, no. 4 (2023): 1655. http://dx.doi.org/10.3390/jcm12041655.

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This study aimed to investigate the efficacy of balloon dilation in ureteral stricture and to analyze the risk factors for the failure of balloon dilation, which will hopefully provide some reference for clinicians to develop treatment plans. We retrospectively analyzed 196 patients who underwent balloon dilation between January 2012 and August 2022, 127 of whom had complete baseline and follow-up data. General clinical data, perioperative data, balloon parameters at the time of surgery, and follow-up results were collected from the patients. Univariate and multivariate logistic regression ana

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Erdogan, Mehmet, and Ali Caliskan. "Dilation of benign esophageal strictures with balloon/bougie; a single center experience." Annals of Medical Research 31, no. 4 (2024): 332. http://dx.doi.org/10.5455/annalsmedres.2024.03.056.

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Objective: Narrowing in the esophagus caused by benign conditions such as peptic injury, surgical anastomosis, radiation therapy, Schatzki rings, esophageal webs, erosive injury and eosinophilic esophagitis are called benign esophageal strictures. In the treatment of benign esophageal stricture, endoscopic dilation with balloon or bougie is the first priority. Method: The study included a total of 96 patients who were diagnosed with a benign stricture at the gastroenterology clinic of our university from May 2009 to October 2023. All patients were symptomatic, and their main complaint was dysp

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Leffler, Charles W., Alberto Nasjletti, Robert A. Johnson, and Alexander L. Fedinec. "Contributions of prostacyclin and nitric oxide to carbon monoxide-induced cerebrovascular dilation in piglets." American Journal of Physiology-Heart and Circulatory Physiology 280, no. 4 (2001): H1490—H1495. http://dx.doi.org/10.1152/ajpheart.2001.280.4.h1490.

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Carbon monoxide (CO) is an endogenous dilator in the newborn cerebral microcirculation. Other dilators include prostanoids and nitric oxide (NO), and interactions among the systems are likely. Experiments on anesthetized piglets with cranial windows address the hypothesis that CO-induced dilation of pial arterioles involves interaction with the prostanoid and NO systems. Topical application of CO or the heme oxygenase substrate heme-l-lysinate (HLL) produced dilation. Indomethacin, N ω-nitro-l-arginine (l-NNA), and either iberiotoxin or tetraethylammonium chloride (TEA) were used to inhibit pr

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Kanu, Alie, and Charles W. Leffler. "Carbon monoxide and Ca2+-activated K+ channels in cerebral arteriolar responses to glutamate and hypoxia in newborn pigs." American Journal of Physiology-Heart and Circulatory Physiology 293, no. 5 (2007): H3193—H3200. http://dx.doi.org/10.1152/ajpheart.00274.2007.

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Large-conductance calcium-activated potassium (KCa) channels regulate the physiological functions of many tissues, including cerebrovascular smooth muscle. l-Glutamic acid (glutamate) is the principal excitatory neurotransmitter in the central nervous system, and oxygen tension is a dominant local regulator of vascular tone. In vivo, glutamate and hypoxia dilate newborn pig cerebral arterioles, and both dilations are blocked by inhibition of carbon monoxide (CO) production. CO dilates cerebral arterioles by activating KCa channels. Therefore, the present study was designed to investigate the e

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Ngai, Al C., and H. Richard Winn. "Pial arteriole dilation during somatosensory stimulation is not mediated by an increase in CSF metabolites." American Journal of Physiology-Heart and Circulatory Physiology 282, no. 3 (2002): H902—H907. http://dx.doi.org/10.1152/ajpheart.00128.2001.

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Pial arterioles supplying the hindlimb somatosensory cortex dilate in response to contralateral sciatic nerve stimulation. The mechanism of this pial vasodilation is not well understood. One possibility is that vasoactive metabolites released during brain activation may diffuse to subarachnoid cerebrospinal fluid (CSF) to dilate pial vessels. To test this hypothesis, we implanted closed cranial windows in rats and measured pial arteriolar dilation to sciatic nerve stimulation during constant rate superfusion of the pial surface with artificial CSF. We reason that flushing the pial surface with

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Ignacio, C. S., P. E. Curling, W. F. Childres, and R. M. Bryan. "Nitric oxide-synthesizing perivascular nerves in the rat middle cerebral artery." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 273, no. 2 (1997): R661—R668. http://dx.doi.org/10.1152/ajpregu.1997.273.2.r661.

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Although perivascular nerves containing nitric oxide synthase (NOS) have been anatomically described for rat cerebral arteries, a dilator function for these nerves has eluded investigators when using isolated vessels. Rat middle cerebral arteries (MCAs) were isolated, pressurized, and electrically stimulated. The resting diameter of the MCAs after pressurization was 233 +/- 4 microns (n = 17) in one study. The MCAs showed a frequency-dependent dilation when stimulated. Maximum dilation (25-30% increase in diameter) occurred at a frequency of 8-16 Hz. Removal of endothelium or glibenclamide (10

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Barkoudah, Ebrahim, Jonathan H. Jaggar, and Charles W. Leffler. "The permissive role of endothelial NO in CO-induced cerebrovascular dilation." American Journal of Physiology-Heart and Circulatory Physiology 287, no. 4 (2004): H1459—H1465. http://dx.doi.org/10.1152/ajpheart.00369.2004.

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Carbon monoxide (CO) and nitric oxide (NO) are important paracrine messengers in the newborn cerebrovasculature that may act as comessengers. Here, we investigated the role of NO in CO-mediated dilations in the newborn cerebrovasculature. Arteriolar branches of the middle cerebral artery (100–200 μm) were isolated from 3- to 7-day-old piglets and cannulated at each end in a superfusion chamber, and intravascular pressure was elevated to 30 mmHg, which resulted in the development of myogenic tone. Endothelium removal abolished dilations of pressurized pial arterioles to bradykinin and to the CO

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Wang, Yinghong, Elliot Baerman, Carolina Colli Cruz, Samuel Black, Saivaroon Gajagowni, and Brian Weston. "Outcome of radiation related esophageal stricture from endoscopic dilation." Journal of Clinical Oncology 43, no. 4_suppl (2025): 387. https://doi.org/10.1200/jco.2025.43.4_suppl.387.

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387 Background: Esophageal strictures present a significant challenge, particularly in cases of radiation-induced strictures. Esophageal dilation is a commonly used intervention aimed at improving swallowing function and nutritional status. However, radiation-induced strictures are amongst the most refractory to dilation. Understanding the success and limitations of this procedure is crucial for optimizing patient outcomes in the cancer population. Methods: This was a single-center retrospective chart review of 736 patients who received radiation as well as an EGD between 2014 and 2024. Patien

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Bloom, David A., Robert N. Mory, and Frank Hinman. "Dilation vs. Dilatation: A Brief History." Journal of Urology 147, no. 6 (1992): 1682. http://dx.doi.org/10.1016/s0022-5347(17)37677-2.

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Yartsev, V. N., and G. T. Ivanova. "Effect of nephrectomy on the reactivity of arteries from the Wistar rats." Nephrology (Saint-Petersburg) 29, no. 2 (2025): 72–79. https://doi.org/10.36485/1561-6274-2025-29-2-72-79.

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BACKGROUND. Cardiovascular diseases are the main cause of death in patients with chronic kidney disease (CKD). The study of the mechanisms of vascular dysfunction in CKD is relevant. To simulate CKD, a decrease in the mass of functioning nephrons is used in the experiments.THE AIM. The effect of nephrectomy on the dilator and constrictor properties of the arteries was studied in experiments on segments of the superior mesenteric artery (SMA) and internal carotid artery (ICA) of Wistar rats.MATERILS AND METHODS. Nephrectomy in rats was performed by resection of 5/6 of the mass of renal tissue.

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Seo, Min-Gi, and Tae-Gon Kim. "Mechanical Dilation of the Recipient Vessel with the DeBakey Vascular Dilator in Lower Extremity Reconstruction: A Report of Two Cases." Archives of Plastic Surgery 50, no. 03 (2023): 311–14. http://dx.doi.org/10.1055/s-0043-1764309.

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AbstractIn lower extremity reconstruction, the recipient vessel often requires long-range mechanical dilation because of extensive vasospasm or plaque formation induced by concomitant atherosclerosis. While a forceps dilator can be used to manipulate and dilate vessels approximately 1 cm from their end, a DeBakey vascular dilator can dilate long-range vessels. The authors successfully performed free flap reconstruction of the lower extremity using the DeBakey vascular dilator. Of the two patients who underwent lower extremity reconstruction, one had extensive vasospasm, and the other had plaqu

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Leffler, Charles W., Alexander L. Fedinec, Helena Parfenova, and Jonathan H. Jaggar. "Permissive contributions of NO and prostacyclin in CO-induced cerebrovascular dilation in piglets." American Journal of Physiology-Heart and Circulatory Physiology 289, no. 1 (2005): H432—H438. http://dx.doi.org/10.1152/ajpheart.01195.2004.

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Endogenously produced CO is an important dilator in newborn cerebrovascular circulation. CO dilates cerebral arterioles by activating Ca2+-activated K+ channels, but modulatory actions of other effectors and second messenger inputs are unclear. Specifically, the mechanisms behind the obligatory permissive roles of prostacyclin and NO are uncertain. Therefore, the present study was performed using acutely implanted, closed cranial windows in newborn pigs to address the hypothesis that the permissive roles of NO and prostacyclin in cerebrovascular dilation in response to CO involve a common mech

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Deshpande, R., та H. Bhate. "Some crystallographic Haar type composite dilation wavelets for P4 = C4 ⋉ ℤ2". International Journal of Wavelets, Multiresolution and Information Processing 16, № 03 (2018): 1850020. http://dx.doi.org/10.1142/s0219691318500200.

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Composite dilation wavelets generate bases or frames using two groups of dilations. One group is associated with a set [Formula: see text] where [Formula: see text] is an expanding matrix with [Formula: see text] an integer. The second group is associated with the subgroup [Formula: see text] of matrices [Formula: see text] with [Formula: see text] Here, we present crystallographic Haar type composite dilation wavelets generated by such two dilation groups associated with [Formula: see text] Further, we provide matricial filters and reconstruction formulae at various scales.

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Clifton, V. L., R. Crompton, M. A. Read, P. G. Gibson, R. Smith, and I. M. R. Wright. "Microvascular effects of corticotropin-releasing hormone in human skin vary in relation to estrogen concentration during the menstrual cycle." Journal of Endocrinology 186, no. 1 (2005): 69–76. http://dx.doi.org/10.1677/joe.1.06030.

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Females have a significantly greater life expectancy than males, which in part may be due to the cardio-protective effects of the female sex hormone, estrogen, on vascular function. However, the sex-specific mechanisms contributing to these differences are complex and not fully understood. Previously we have reported that corticotropin-releasing hormone (CRH) has potent dilator effects in the female skin circulation via mast cell degranulation. Furthermore the dilator response to CRH was more enhanced in females than in age-matched males, suggesting that estrogens may be involved. In this stud

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Dornyei, G., G. Kaley, and A. Koller. "Release of nitric oxide and prostaglandin H2 to acetylcholine in skeletal muscle venules." American Journal of Physiology-Heart and Circulatory Physiology 272, no. 6 (1997): H2541—H2546. http://dx.doi.org/10.1152/ajpheart.1997.272.6.h2541.

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The role of endothelium in regulating venular resistance is not well characterized. Thus we aimed to elucidate the endothelium-derived factors involved in the mediation of responses of rat gracilis muscle venules to acetylcholine (ACh) and other vasoactive agents. Changes in diameter of perfusion pressure (7.5 mmHg)- and norepinephrine (10(-6) M)-constricted venules (approximately 225 microns in diam) to cumulative doses of ACh (10(-9) to 10(-4) M) and sodium nitroprusside (SNP, 10(-9) to 10(-4) M), before and after endothelium removal or application of various inhibitors, were measured. Lower

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Wajda, Tadeusz. "Dilation of Time Dilation." Applied Physics Research 9, no. 6 (2017): 67. http://dx.doi.org/10.5539/apr.v9n6p67.

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The study addresses the issue of the so-called time dilation in the sense of the origin of its creation and the physical existence.Based on the work of Lorentz, who the lack of displacement of interference fringes in the Michelson interferometer explained wrongly with, shortening one arm of the interferometer, I propose the construction of the light pulse clock, in which to measure the rate of the passage of time is used constancy speed of light in vacuum.Light clock, the construction of which is described in the paper, stationary in relation to the ether, will measure constant time intervals.

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Veseliny, Eduard, Martin Janičko, Mária Zakuciová, and Peter Jarčuška. "Short-term and long-term results of pneumatic dilation in the treatment of patients with esophageal achalasia: 16 years of experience." Gastroenterologie a hepatologie 76, no. 3 (2022): 236–43. http://dx.doi.org/10.48095/ccgh2022236.

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Background: Pneumatic dilation (PD) is still a common treatment of oesophageal achalasia. This retrospective analysis informs about 16 years of experience with pneumatic dilation in the treatment of patients with achalasia. Patients and methods: Consecutive patients with achalasia treated with endoscopic balloon dilation therapy were analysed retrospectively. The success of endoscopic pneumatic dilation was defined as no treatment other than pneumatic dilation and the overall clinical Eckardt score ≤ 3 (and at the same time each individual item <2). Results: From January 2004 to December 20

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Leffler, C. W., D. W. Busija, W. M. Armstead, D. R. Shanklin, R. Mirro, and O. Thelin. "Activated oxygen and arachidonate effects on newborn cerebral arterioles." American Journal of Physiology-Heart and Circulatory Physiology 259, no. 4 (1990): H1230—H1238. http://dx.doi.org/10.1152/ajpheart.1990.259.4.h1230.

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We have observed that pial arteriolar dilation in response to hypercapnia and hypotension is abolished after cerebral ischemia in newborn pigs. We determined whether direct generation of activated oxygen on the brain surface (OX: xanthine oxidase, hypoxanthine, FeCl3, and FeSO4) or topical arachidonate altered pial arteriolar responsiveness in a manner similarly to cerebral ischemia. OX, which generated more brain surface superoxide than reperfusion after ischemia, dilated pial arterioles. This dilation was reversed within 10 min of the end of exposure. OX produced ultrastructural changes in p

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Acharya, Ganesh Bhakta, Anil Shrestha, Hari Bahadur KC, Robin Bahadur Basnet, Aravind Kumar Shah, and Paras Mani Shrestha. "Randomized study comparing safety and efficacy of one shot versus serial metal telescopic dilation technique in percutaneous nephrolithotomy." Journal of Society of Surgeons of Nepal 20, no. 2 (2017): 13–19. http://dx.doi.org/10.3126/jssn.v20i2.24376.

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Introduction: Dilation of the track can be achieved by multiple incremental flexible Amplatz type, Alken metal telescoping dilators, or balloon in Percutaneous Nephrolithotomy (PCNL). Balloon dilator is the most expensive method. Both of the incremental dilation techniques are more time consuming with higher failure rates. Hence, a prospective randomized study was conducted to compare the safety and efficacy of “single shot” dilation of the nephrostomy tract by amplatz dilator with serial alken metallic telescopic dilation technique in PCNL. Methods: Of the 138 renal stone patients who u

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Golding, Elke M., and Tara E. Kepler. "Role of estrogen in modulating EDHF-mediated dilations in the female rat middle cerebral artery." American Journal of Physiology-Heart and Circulatory Physiology 280, no. 6 (2001): H2417—H2423. http://dx.doi.org/10.1152/ajpheart.2001.280.6.h2417.

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We tested the hypothesis that endothelium-derived hyperpolarizing factor (EDHF) plays a less dominant role in the female cerebrovasculature. The contribution of EDHF to the ATP-mediated dilation was determined in middle cerebral arteries (MCAs) isolated from male and female rats. Four groups of rats were tested: intact male ( n = 12), intact female ( n= 13), estrogen-treated ovariectomized female ( n = 13), and vehicle-treated ovariectomized female ( n = 20) rats. Maximal dilation to ATP was similar in all groups. However, in the presence of N ω-nitro-l-arginine methyl ester (l-NAME, 3 × 10−5

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Huang, An, Dong Sun, Edward G. Shesely, Ellen M. Levee, Akos Koller, and Gabor Kaley. "Neuronal NOS-dependent dilation to flow in coronary arteries of male eNOS-KO mice." American Journal of Physiology-Heart and Circulatory Physiology 282, no. 2 (2002): H429—H436. http://dx.doi.org/10.1152/ajpheart.00501.2001.

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Flow-induced dilation was examined in isolated coronary arteries of endothelial nitric oxide (NO) synthase knockout mice (eNOS-KO) and wild-type (WT) mice. The basal tone of arteries (percentage of passive diameter) was significantly greater in eNOS-KO than in WT mice; their flow-induced dilations, however, were similar. Endothelial removal eliminated the dilations in vessels of both strains of mice. In arteries of WT mice, N ω-nitro-l-arginine methyl ester (l-NAME) (10−4 M) or indomethacin (10−5 M) alone, inhibited flow-induced dilation by ∼50%, whereas their simultaneous administration aboli

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Daniel, Philip, Jayanta Samanta, Ajay Gulati, et al. "Can high-frequency mini-probe endoscopic ultrasonography predict outcome of endoscopic dilation in patients with benign esophageal strictures?" Endoscopy International Open 08, no. 10 (2020): E1371—E1378. http://dx.doi.org/10.1055/a-1223-1377.

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Abstract Background and study aims Endoscopic dilation is first-line management for benign esophageal strictures (ES). Depth of involvement of the esophageal wall on endosonography using high frequency mini-probe (EUS-M) may predict response to dilation. This study evaluated EUS-M characteristics to predict response of ES to endoscopic dilation. Patients and methods EUS-M was used to measure the total esophageal wall thickness (EWT), involved EWT, percentage of involved wall and layers of wall involved in consecutive patients of benign ES. After a maximum of five sessions of endoscopic dilatio

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Pakmanesh, Hamid, Azar Daneshpajooh, Mahboubeh Mirzaei, et al. "Amplatz versus Balloon for Tract Dilation in Ultrasonographically Guided Percutaneous Nephrolithotomy: A Randomized Clinical Trial." BioMed Research International 2019 (January 3, 2019): 1–8. http://dx.doi.org/10.1155/2019/3428123.

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Purpose. To compare balloon with Amplatz for tract dilation in totally ultrasonographically guided PCNL (UPCN). Methods. We randomized 66 patients candidate for sonographically guided PCNL in the flank position in two study groups. In the first group, we used single step Amplatz dilation (AG) technique in which the 28- or 30-French Amplatz dilator is used for tract dilation. In the other group, we dilated the tract using balloon dilator (BG). We compared procedure time, success rate of dilation, and postoperative clinical outcomes and cost between two groups. Results. The rate of short dilatio

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Koller, A., D. Sun, E. J. Messina, and G. Kaley. "L-arginine analogues blunt prostaglandin-related dilation of arterioles." American Journal of Physiology-Heart and Circulatory Physiology 264, no. 4 (1993): H1194—H1199. http://dx.doi.org/10.1152/ajpheart.1993.264.4.h1194.

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The effects of arginine analogues, inhibitors of endothelium-derived nitric oxide synthesis, on dilation of arterioles in response to various vasoactive substances were studied. At 65 mmHg intravascular pressure, isolated arterioles of rat cremaster muscle developed tone spontaneously and achieved control diameters similar to those observed in vivo (84.1 +/- 2.0 microns vs. passive diameter: 161.3 +/- 3.4 microns). Acetylcholine (ACh, 5 x 10(-8) M), sodium nitroprusside (SNP, 5 x 10(-8) M), arachidonic acid (AA, 10(-7) M), prostaglandin E2 (PGE2, 10(-9) M), and adenosine (ADO, 10(-6) M) were a

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Juhasova, Jana, Martina Kreft, Roland Zimmermann, and Nina Kimmich. "Impact factors on cervical dilation rates in the first stage of labor." Journal of Perinatal Medicine 46, no. 1 (2018): 59–66. http://dx.doi.org/10.1515/jpm-2016-0284.

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AbstractAims:To assess cervical dilation rates of nulliparous and multiparous women in the active first stage of labor and to evaluate significant impact factors.Methods:In a retrospective cohort study between January 2007 and July 2014 at the University Hospital of Zurich in Switzerland, we analyzed 8378 women with singleton pregnancies in vertex presentation with a vaginal delivery at 34+0 to 42+5 gestational weeks. Median cervical dilation rates were calculated and different impact factors evaluated.Results:Cervical dilation rates increase during labor progress with faster rates in multipar

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Hoepfl, Bernd, Barbara Rodenwaldt, Ulrich Pohl, and Cor de Wit. "EDHF, but not NO or prostaglandins, is critical to evoke a conducted dilation upon ACh in hamster arterioles." American Journal of Physiology-Heart and Circulatory Physiology 283, no. 3 (2002): H996—H1004. http://dx.doi.org/10.1152/ajpheart.01082.2001.

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Vasomotor reactions upon focal stimulation of arterioles have been shown to be conducted along the vascular wall. Such a conduction, which is assumed to reflect the spread of electrical signals, may contribute to coordination of responses within a vascular segment. We aimed to identify which endothelial autacoid(s) act as mediators of the local and conducted dilator responses, respectively. To this end, arterioles in the hamster cremaster microcirculation were locally stimulated with endothelium-dependent [acetylcholine (ACh)] or endothelium-independent dilators [sodium nitroprusside (SNP)], a

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Brayden, Joseph E., and George C. Wellman. "Endothelium-Dependent Dilation of Feline Cerebral Arteries: Role of Membrane Potential and Cyclic Nucleotides." Journal of Cerebral Blood Flow & Metabolism 9, no. 3 (1989): 256–63. http://dx.doi.org/10.1038/jcbfm.1989.42.

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The objective of this study was to characterize the role of membrane potential and cyclic nucleotides in endothelium-dependent dilation of cerebral arteries. Middle cerebral arteries isolated from cats were depolarized and constricted in response to serotonin or when subjected to transmural pressures >50 mm Hg. Acetylcholine (ACh) and ADP caused vasodilation and a sustained, dose-dependent hyperpolarization of up to 20 mV in this artery. The membrane potential change preceded the vasodilation by ∼6 s. Hyperpolarizations and dilations to ACh and ADP did not occur in preparations without endo

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Kudryashov, Yu L. "Dilatations of Linear Operators." Contemporary Mathematics. Fundamental Directions 66, no. 2 (2020): 209–20. http://dx.doi.org/10.22363/2413-3639-2020-66-2-209-220.

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The article is devoted to building various dilatations of linear operators. The explicit construction of a unitary dilation of a compression operator is considered. Then the J -unitary dilatation of a bounded operator is constructed by means of the operator knot concept of a bounded linear operator. Using the Pavlov method, we construct the self-adjoint dilatation of a bounded dissipative operator. We consider spectral and translational representations of the self-adjoint dilatation of a densely defined dissipative operator with nonempty set of regular points. Using the concept of an operator

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Ornellas, Laura Cotta, Gilda da Cunha Santos, Frank Shigueo Nakao, and Angelo Paulo Ferrari. "Comparison between endoscopic brush cytology performed before and after biliary stricture dilation for cancer detection." Arquivos de Gastroenterologia 43, no. 1 (2006): 20–23. http://dx.doi.org/10.1590/s0004-28032006000100007.

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BACKGROUND: Confirmation of malignancy within biliary strictures is endoscopically challenging. Dilation of strictures has been reported to enhance cytological diagnosis. AIM: To compare brush cytology results before and after biliary stricture dilation. PATIENTS AND METHODS: Patients with extra-hepatic biliary stricture at endoscopic retrograde cholangiopancreatography were included in the study. Brushing was performed before and immediately after dilation using a 10 Fr dilating catheter. Cytology samples were classified as: negative for malignancy, presence of atypical cells, insufficient ma

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