Relevant bibliographies by topics / Packed cell volume (PCV)

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Packed cell volume (PCV)'

Author: Grafiati
Published: 4 June 2021
Last updated: 15 February 2022

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Journal articles on the topic "Packed cell volume (PCV)"

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Alwan, Zena Ahmed, Suhair Mohammed Yaseen, and Huda Farooq Jameel. "MATLAB modeling to evaluate the ratio of packed cell volume." Indonesian Journal of Electrical Engineering and Computer Science 23, no. 1 (July 1, 2021): 414. http://dx.doi.org/10.11591/ijeecs.v23.i1.pp414-420.

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<p>There are many direct and indirect methods of measuring the volumetric ratioof red blood cells relative to sample size and total blood, but the manual carcinogenic method remains the most stable and least expensive method despite the possibility of human error.The ratio percent of the packed red blood cell volume to the total volume of the blood sample is known as the packed cell volume (PCV). Our efforts were directed at finding a precise and economic method for PCV determination. There by, we designed a simple device consisting of a digital camera that is connected to a computer which uses a specific MATLAB program to process the blood images. As a result,the image can be read and the PCV can be calculated using a special code system. This new measuring system provides the capabilities and advantagesto frequently comment on measured PCV with normal or abnormal, in comparison with normal values of PCV, which are stored in the computer. Our measurement method provides accurate results compared to the ruler results to alleviate the effort of clearing the hepatitis C virus from the blood (PCV). This system enables a swift and simple sample analysis and PCV identification.</p>
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Sam-Wobo, S. O., O. O. Malumi, C. F. Mafiana, B. C. Oganah, and O. A. Surakat. "Malaria Parasites and Packed Cell Volume of Free Range Poultry in Abeokuta metropolis, Ogun State, Nigeria." NIGERIAN ANNALS OF PURE AND APPLIED SCIENCES 6 (December 28, 2015): 68–74. http://dx.doi.org/10.46912/napas.10.

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Malaria parasites and packed cell volume offree range poultry was conducted on one hundred free range chickens collected from three communities in Abeokuta (Osiele, Lafenwa and Kuto). The results revealed that out of the 100 free range chickens examined, 13(13%) were infected with avian malaria parasite. Hematological parameter i.e. packed cell volume (PCV) revealed that chicken with PCV range 16-20 were 33.33% positive for malaria parasite. Others between PCV ranges 21 – 25 were 33.3%, while those between PCV ranges of 26 – 30 were 16.66% and those with PCV range of 31 – 35 were 16.67%.Chi-square analysis showed a significant difference between packed cell volume and malaria parasite(p<0.05). However, no significant difference was observed between sex and malaria parasite(p>0.05). The presence of avian malaria parasites in the study area could be of some epidemiological implications since the infected poultry could act as reservoir for malaria parasites.
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Ross, Elizabeth H., and Amy Dickinson. "Dilutional Effect of Ethylenediaminetetraacetic Acid on Packed Cell Volume in Healthy Dogs." Journal of the American Animal Hospital Association 57, no. 5 (August 8, 2021): 199–204. http://dx.doi.org/10.5326/jaaha-ms-7060.

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ABSTRACT Packed cell volume (PCV) is commonly used to assess and monitor red blood cell count in animals, but the results can be altered if inappropriate ratios of anticoagulant/blood are used. The purpose of this study was to determine the effect of ideally filled, overfilled, and underfilled K3 ethylenediaminetetraacetic acid (EDTA) tubes with various volumes of healthy dog blood on centrifuged PCV. Six milliliters of blood was obtained from 94 blood donors each. Initial distribution was injected into two nonheparinized microhematocrit tubes. The remainder was instilled into 1.3 mL K3 EDTA spray-dried tubes as 1.5 mL, 1.3 mL, 0.75 mL, 0.5 mL, and 0.25 mL aliquots. Normality was determined using the D’agostino–Pearson method and by visual examination of histograms. Data were analyzed using a repeated-measures analysis of variance with post hoc testing using Tukey’s test. There is a statistically significant decrease in the PCV between all groups with progressive underfilling of tubes (P &lt; .0001). The closest difference is between 1.5 and 1.3 mL (P = .0138). Our study suggested that underfilling K3 EDTA tubes significantly and negatively influences the PCV in healthy dogs. Using underfilled K3 EDTA tubes result in a lower PCV compared with directly filled microhematocrit tubes without anticoagulant.
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Callan, MB, DA Oakley, FS Shofer, and U. Giger. "Canine red blood cell transfusion practice." Journal of the American Animal Hospital Association 32, no. 4 (July 1, 1996): 303–11. http://dx.doi.org/10.5326/15473317-32-4-303.

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Red blood cell (RBC) transfusions in 307 dogs were reviewed. A total of 658 units of RBCs, including 474 (72%) units of packed red blood cells (PRBCs) and 184 (28%) units of whole blood (WB), were administered. Reasons for transfusion included hemorrhage (n = 222), hemolysis (n = 43), and ineffective erythropoiesis (n = 42). The mean pretransfusion packed cell volume (PCV) of dogs with hemolysis (13%) was significantly lower (p less than 0.0001) than the mean pretransfusion PCVs of dogs with hemorrhage (21%) or ineffective erythropoiesis (18%). The mean total volume of PRBCs transfused was significantly greater (p less than 0.03) in dogs with hemolysis. Overall, 187 (61%) of 307 dogs were discharged from the hospital. Cause of anemia, pretransfusion PCV, and total volume of blood administered did not appear to influence survival. However, the mean adjusted posttransfusion PCV of dogs with hemorrhage was significantly higher (p less than 0.001) in dogs that survived. Possible adverse events were observed during or shortly after RBC transfusion in 10 (3.3%) dogs; all reactions were mild and self-limiting, and none were hemolytic.
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Breheny, Craig R., Jorge Perez-Accino Salgado, Nicholas X. Bommer, Ian Handel, and Adam G. Gow. "Standard operating procedure reduces interoperator variation and improves accuracy when measuring packed cell volume." Veterinary Record 184, no. 9 (February 2, 2019): 283. http://dx.doi.org/10.1136/vr.104774.

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ObjectiveTo evaluate whether a standard operating procedure (SOP) for canine packed cell volume (PCV) measurement reduces operator-dependent variation and improves accuracy within a veterinary teaching hospital environment.Materials and methodsClinical staff and final-year undergraduate veterinary students were recruited to perform PCV measurements in blinded duplicate samples. Participants were randomly allocated to perform this with or without an SOP. Participants’ results were compared against a reference, generated by the authors following the World Health Organization guidelines.ResultsThe study population comprised 18 clinical staff and 39 students. Three clinical staff and seven students displayed errors consistent with inaccurate reading, only one of whom had access to the SOP. Five students and two clinical staff had errors attributable to incorrect preparation, with only one having access to the SOP. Interoperator variation was significantly less using the SOP. Using the SOP, 95 per cent of the results were within 0.0125 l/l of the reference value, in comparison with within 0.09 l/l without SOP. Interoperator variation was significantly less in the SOP group (P=0.0025).Clinical significanceUsing the SOP resulted in less variation and more accurate results. This confirms that PCV measurement with an SOP can truly be a ‘waived’ test.
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IGBOKWE, I. O., and N. M. SANU. "THE STABILITY OF THE PACKED CELL VOLUME OF ANTICOAGULATED BOVINE BLOOD STORED AT REFRIGERATION TEMPERATURE." Nigerian Journal of Animal Production 18 (January 12, 2021): 111–12. http://dx.doi.org/10.51791/njap.v18i.2010.

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Bovine blood samples with ethylene diamine tetra-acetate (EDTA) or oxalate as anticoagulant were stored at refrigeration temperature of 4°C. The packed cell volume (PCV) was determined daily. During storage, the PCV did not vary significantly. Complete haemolysis, suggested by failure of blood samples to separate into cellular and plasma fractions, started occuring in samples on days 28 and 17, and was observed to have occurred in all samples on days 41 and 24 in blood with EDTA and oxalate respectively.
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Audu, L. I., A. T. Otuneye, A. B. Mairami, L. J. Mshelia, and V. E. Nwatah. "Posttransfusion Haematocrit Equilibration: Timing Posttransfusion Haematocrit Check in Neonates at the National Hospital, Abuja, Nigeria." International Journal of Pediatrics 2015 (2015): 1–5. http://dx.doi.org/10.1155/2015/175867.

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Anaemia is a common morbidity in the NICU and often requires transfusion of packed red blood cells. Haematocrit equilibration following red cell transfusion occurs over time ultimately resulting in a stable packed cell volume (PCV). Knowledge of this equilibration process is pertinent in the accurate timing of posttransfusion (PT) PCV. We conducted a prospective study to determine an appropriate timing for PT PCV estimation on 47 stable anaemic babies at the Neonatal Unit of National Hospital, Abuja. Values of PCV were determined before transfusion and at 1, 6, 12, 24, and 48 hours posttransfusion. Forty of the recruited neonates and young infants were analyzed. Their gestational age range was 26 to 40 weeks. 1-hour PT PCV (48.5% ± 5.5%) was similar to the 6-hour PT PCV (47.8% ± 5.6%)P=0.516, but both were significantly different from the 12-hour (46.8% ± 5.9%), 24-hour (45.9 ± 5.8%), and 48-hour (45.4% ± 6.2%) PT PCVs. The 12-hour PT PCV was similar to the 24-hour and 48-hour PT PCVs (P=0.237and 0.063, resp.). We concluded that, in stable nonhaemorrhaging and nonhaemolysing young infants, the estimated timing of haematocrit equilibration and, consequently, posttransfusion PCV is 12 hours after red blood cell transfusion.
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Audu I, Stephen, Simon T. Ubwa, Ogbene G. Igbum, Stephen S. Hati, and NwannadiI Alex. "Analytical Comparison between Microhematocrit and Automated Methods for Packed Cell Volume (PCV)." International Journal of Hematology and Blood Disorders 2, no. 1 (July 10, 2017): 1–4. http://dx.doi.org/10.15226/2639-7986/2/1/00105.

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Al-Odeh, Ahmed, Zsolt A. Varga, and Gianni D. Angelini. "Haematocrit measurements during cardiopulmonary bypass surgery: comparison of three stat methods with a blood cell counter." Perfusion 9, no. 2 (March 1994): 127–34. http://dx.doi.org/10.1177/026765919400900207.

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Monitoring packed cell volume (PCV) is essential to safeguard oxygen delivery to the tissues during cardiopulmonary bypass (CPB). We compared the results obtained using a PCV monitor, a blood gas analyser and a microcentrifuge with those from a laboratory-based automated blood cell counter. PCV was measured in 221 samples of 40 patients undergoing open-heart surgery. The limits of agreement (mean difference ± 2 SD) was unacceptably wide when the results obtained with the PCV monitor and the blood gas analyser were compared with those of the automated blood cell counter. This was most pronounced when PCV was measured in low concentration samples. The microcentrifuge showed good limits of agreement regardless of sample concentration. The data suggests that measurement of PCV by either continuous monitoring or by a blood gas analyser is not an accurate alternative to an established laboratory method. The microcentrifuge is the most accurate method of the ones investigated to measure haematocrit during CPB.
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Oyewale, J. O., and L. A. Durotoye. "Osmotic fragility of erythrocytes of two breeds of domestic fowl in the warm humid tropics." Laboratory Animals 22, no. 3 (July 1, 1988): 250–54. http://dx.doi.org/10.1258/002367788780746340.

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Erythrocyte (RBC) count, packed cell volume (PCV) and haemoglobin (Hb) values were found to be higher in Nigerian domestic fowls than those in Hubbard fowls. PCV and Hb values were higher in males than in females in both breeds. Erythrocytes of the Nigerian fowl were observed to be more susceptible to osmotic haemolysis than were erythrocytes of the Hubbard fowl. Erythrocytes of male fowls were osmotically more fragile than were those of female fowls in both breeds.
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Dissertations / Theses on the topic "Packed cell volume (PCV)"

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Coutinho, Renata Maria Alves. "Marcadores fenot?picos para caracteriza??o de caprinos com diferentes n?veis de resist?ncia ?s endoparasitoses gastrintestinais." Universidade Federal do Rio Grande do Norte, 2012. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17171.

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Made available in DSpace on 2014-12-17T15:34:44Z (GMT). No. of bitstreams: 1 RenataMAC_DISSERT.pdf: 1125273 bytes, checksum: 6bd33833f33ca21674933995a1ccf14a (MD5) Previous issue date: 2012-02-28
Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior
The aim of this study was to evaluate and characterize phenotypically goats with different levels of resistance to gastrointestinal nematodes. For a period of 93 days, 60 F2 goats originated from ? Saanen and ? Anglo- nubian animals were kept in the same area of pasture. Every seven days, feces and blood were collected for eggs per gram counts of feces (EPG) and cultures of feces and to determinate the number of eosinophils, packed cell volume and total plasma protein, respectively. On the same day, the animals were weighed and submitted to body score condition and FAMACHA method to worm control. Based on the average of EPG, the twelve animals with the highest average (susceptible group) and the twelve animals with the lowest average of EPG (resistant group) were selected, slaughtered and necropsied to recovery, counting andparasites identification. The resistant animals present lower EPG mean (P <0.0001) and 4.7 folder less parasites than susceptible animals. The resistant group presented higher mean packed cell volume (26.48%) and total plasma protein (6.24 g / dl) than susceptible one (24,04% e 5,82g/dl, respectively). The average number of eosinophils was similar in both groups The Haemonchus sp. was the most prevalent in the culture of feces, followed by Trischostrongylus sp. and Oesophagostomum sp.. The counting of nematodes in the abomasum of susceptible group was higher than in resistant one. The species identified were H. contortus in abomasums and T. colubriformis in small intestine. It can be concluded that EPG, packed cell volume and total plasma protein were useful phenotypic markers to identify animals as resistant and susceptible to gastrointestinal nematodes infections
O presente trabalho teve como objetivo de avaliar e caracterizar fenotipicamente caprinos com diferentes n?veis de resist?ncia a nematoides gastrintestinais. Em um per?odo de 93 dias, 60 caprinos F2 oriundos do cruzamento de animais ? Saanen e ? Anglo-nubiano foram mantidos em uma mesma ?rea de pastagem cultivada irrigada de capim Tanz?nia (Panicum maximum Jacq. Cv Tanz?nia). A cada sete dias, fezes e sangue foram coletados para contagem de ovos por grama de fezes (OPG), coproculturas, contagem de eosin?filos, determina??o de volume globular e prote?na plasm?tica total, respectivamente. No mesmo dia das coletas, os animais foram pesados e avaliados quanto ao escore da condi??o corporal e grau de anemia com aux?lio no cart?o FAMACHA. Com base na m?dia de OPG, os doze animais com as maiores m?dias de OPG (grupo suscept?vel) e os doze animais com as menores m?dias de OPG (grupo resistente) foram identificados e selecionados para serem abatidos e necropsiados para a recupera??o, contagem e identifica??o dos parasitos presentes. Os animais pertencentes ao grupo resistente apresentaram menor m?dia de OPG (P<0,0001) e 4,7 vezes menos parasitos adultos do que os animais do grupo suscept?vel. O grupo resistente obteve maior m?dia de volume globular (26,48%) e prote?na plasm?tica total (6,24 g/dl) do que os animais suscept?veis (24,04% e 5,82g/dl, respectivamente). A m?dia de eosin?filos foi semelhante nos dois grupos .O g?nero Haemonchus foi o mais prevalente a nas coproculturas, seguido por Trischostrongylus e Oesophagostomum. A contagem de nematoides foi maior no abomaso do grupo suscept?vel do que no grupo resistente. As esp?cies identificadas foram H. contortus no abomaso e T. colubriformis no intestino delgado. Conclui-se que OPG, volume globular e prote?na plasm?tica total foram marcadores fenot?picos eficientes para identificar animais resistentes e suscept?veis ?s infec??es causadas por nematoides gastrintestinais
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Guedes, Rogério Luizari. "ELETROCIRURGIA E CLIPES DE TITÂNIO PARA HEMOSTASIA EM PEDÍCULOS OVARIANOS DURANTE OVARIOHISTERECTOMIA VIDEOASSISTIDA COM DOIS PORTAIS EM CADELAS." Universidade Federal de Santa Maria, 2012. http://repositorio.ufsm.br/handle/1/10115.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico
This study evaluated the use of bipolar electrosurgery and laparoscopic clip applier with respect to surgical time, blood loss and inflammatory response during video-assisted ovariohysterectomy with two portals. Two groups (n=10) assessed each of the hemostatic techniques during castration and a third group (GIII, n=6) evaluated changes in serum promoted only by the clinical and anesthetic protocols used in order to exclude the changes made by them. The surgical times, such as the volume of blood loss were significantly lower in Bipolar Group. The inflammatory response was significantly higher throughout the evaluation period after surgery, but no clinical manifestations different than those presented by the Clipador Group. There were no significant changes in packed cell volume between the groups, but among the times evaluated it reduced about 10% from initial value until four hours after the procedure, in the surgical groups and Group III. Both techniques have good execution by the video-assisted procedure, however, the use of bipolar forceps allows minor surgical times, minimal blood loss and shorter learning curve for the surgeon. The bleeding does not result in physiological changes and that one s on packed cell volume are presented because of the clinical and anesthetic protocols.
Este estudo avaliou a utilização da eletrocirurgia bipolar e do clipador laparoscópico em relação ao tempo cirúrgico, perda sanguínea e resposta inflamatória durante a ovariohisterectomia videoassistida com dois portais. Dois grupos (n=10) avaliaram cada uma das técnicas hemostáticas durante as castrações e um grupo (GIII, n=6) avaliou as alterações séricas promovidas somente pelo protocolo clínico e anestésico utilizado, a fim de excluir as alterações promovidas por estes. O tempo cirúrgico, assim como o volume de sangue perdido foram significativamente menores no Grupo Bipolar. A resposta inflamatória apresentou valores significativamente maiores durante todo o período de avaliação pósoperatório, sem manifestações clínicas diferentes das apresentadas pelo Grupo Clipador. Em relação ao hematócrito não houve alterações significativas entre os grupos, mas entre os tempos de avaliação reduziu cerca de 10% do valor inicial, até quatro horas do final do procedimento, tanto nos grupos cirúrgicos como no Grupo III. Ambas as técnicas são de boa execução através do procedimento videoassistido, porém, o uso da pinça bipolar permite menores tempos cirúrgicos, sangramento mínimo e menor curva de aprendizado do cirurgião. O sangramento não acarreta em alterações fisiológicas e as mudanças apresentadas no hematócrito são provenientes dos protocolos clínico e anestésico instituídos.
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Dubé, Catherine. "Évaluation des effets de l'administration de fer intramusculaire sur l'anémie chez les oiseaux de proie." Thèse, 2011. http://hdl.handle.net/1866/5165.

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L’administration de fer dextran à 10 mg/kg intramusculaire (IM) est un traitement empirique couramment recommandé en médecine aviaire lors d’hémorragie ou d’anémie. L’objectif principal de cette étude était d’évaluer les effets de ce traitement sur l’anémie chez les oiseaux de proie. Deux types d’individus ont été utilisés : des crécerelles d’Amérique (Falco sparverius) où une anémie par perte de sang externe aiguë a été créée (deux phlébotomies de 20-40 % du volume sanguin total à un intervalle de 6 h) et des oiseaux de proie sauvages de différentes espèces souffrant d’anémies diverses. L’ensemble des oiseaux a été subdivisé aléatoirement en groupe traitement (fer dextran 10 mg/kg IM) et contrôle (NaCl 0,9% IM). Un suivi dans le temps a été réalisé afin d’étudier leur récupération de l’anémie, la présence d’effets secondaires au traitement et l’impact d’une administration de fer sur ces réserves. Aucune différence significative n’a été observée entre les deux groupes en ce qui concerne les signes cliniques, l’hématocrite, le pourcentage des polychromatophiles/réticulocytes, la densité cellulaire et le fer de la moelle osseuse, la créatine kinase et le fer plasmatique. La majorité des crécerelles ont présenté une myosite au site d’injection du fer. Nos résultats suggèrent qu’une administration de 10 mg/kg de fer dextran IM n’a pas d’effet sur l’érythropoïèse des rapaces souffrant d’anémie par perte de sang externe aiguë, qu’elle provoque une légère inflammation au site d’injection et qu’elle n’influence pas les réserves de fer. Le comptage des réticulocytes en anneau et des polychromatophiles semble être deux méthodes équivalentes.
A 10 mg/kg intramuscular (IM) administration of iron dextran is a common empirical treatment recommended in avian medicine for hemorrhage and anemia. The purpose of this study was to evaluate the effects of this treatment on anemia in birds of prey. Two kinds of specimen were used: the American kestrel (Falco sparverius) where an acute external blood loss anemia was created (with two phlebotomies of 20-40 % of the total blood volume at 6 hours interval) and other various species of wild birds of prey suffering from different types of anemia. All subjects were randomized into a treatment (iron dextran 10 mg/kg IM) or a control (NaCl 0,9 % IM) group. Monitoring was carried out to evaluate the evolution of the anemia, presence of side effects and impact of an iron administration on their iron reserve. No significant differences were observed between the two treatment groups for clinical signs, packed cell volume, the percentage of reticulocytes/polychromatophilic erythrocytes, bone marrow cellularity and iron, plasmatic iron and creatine kinase. Most kestrels had a myositis at the iron injection site. Our results suggest that an IM injection of 10 mg/kg iron dextran has no effect on raptor erythropoiesis after an acute external blood loss anemia, that it has no effect on iron reserve, and that it can cause mild inflammation at the injection site. The polychromatophilic erythrocytes and the reticulocytes ring form count were two equivalent methods.
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Kullmann, Anne. "Effects of xylazine, romifidine and detomidine on haematology, serum biochemistry and splenic size in horses." Diss., 2011. http://hdl.handle.net/2263/29981.

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Alpha 2 agonists are frequently used in equine medicine. This study focused primarily on α2 agonist-induced changes in PCV and TSP. A secondary aim of this study was to investigate the effects of α2 agonist on selected serum biochemical parameters and splenic size in order to identify potential causes for the changes seen in PCV and TSP. Four healthy adult mares were treated in a blinded, randomized, cross-over design with a single dose of xylazine (0.5 mg/kg), romifidine (0.04 mg/kg) or detomidine (0.01 mg/kg) intravenously, or detomidine (0.02 mg/kg) intramuscularly. A 1-week washout period was allowed between treatments. Haematology, TSP, COP, plasma osmolality, glucose, BUN, serum lactate, electrolytes, venous blood pH, ultrasonographic splenic size and degree of clinical sedation were evaluated at different time points post-injection and compared to baseline values. All treatments induced similar clinical sedation in the mares. A significant change over time in PCV and TSP following each treatment was identified, with overall median (range) maximal reductions compared to baseline of 20.9% (12.9 - 27.3%) and 5.8% (3.0 - 10.3%), respectively. Additionally, changes over time were significant for RBC count, BUN, COP and Ca2+, which decreased; and glucose, plasma osmolality, Na+ and splenic size, which increased, when compared to baseline. There was no significant main effect of treatment on PCV, TSP or any other parameters measured except for glucose. This study concluded that changes in PCV, TSP and other biochemical parameters induced by α2 agonists should be taken into consideration when assessing critically ill horses that received these drugs. There was evidence of splenic RBC sequestration as well as fluid shifts; therefore, the results suggest a multifactorial cause for the changes in PCV and TSP.
Dissertation (MSc)--University of Pretoria, 2011.
Companion Animal Clinical Studies
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Book chapters on the topic "Packed cell volume (PCV)"

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Maheshwari, Nanda. "Packed Cell Volume (PCV)." In Clinical Pathology, Haematology and Blood Banking (For DMLT Students), 41. Jaypee Brothers Medical Publishers (P) Ltd., 2008. http://dx.doi.org/10.5005/jp/books/10143_10.

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Geetha, N. "Packed Cell Volume (PCV) or Hematocrit." In Practical Physiology, 29. Jaypee Brothers Medical Publishers (P) Ltd., 2017. http://dx.doi.org/10.5005/jp/books/12995_6.

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Mahajan, Aarti. "Determining of Erythrocyte Sedimentation Rate (ESR) and Packed Cell Volume (PCV)." In Objective Structured Practical Examination in Physiology, 16. Jaypee Brothers Medical Publishers (P) Ltd., 2010. http://dx.doi.org/10.5005/jp/books/11053_9.

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Breheny, Craig, Andrew Brown, Ian Handel, and Adam Gow. "Inter and intra-operator variability in the measurement of the packed cell volume (PCV)." In BSAVA Congress Proceedings 2015, 497–98. British Small Animal Veterinary Association, 2015. http://dx.doi.org/10.22233/9781910443521.68.5.

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Breheny, Craig, and Adam Gow. "Does the colour intensity of a blood spot image obtained by smartphone accurately correlate with canine packed cell volume (PCV)." In BSAVA Congress Proceedings 2017, 486. British Small Animal Veterinary Association, 2017. http://dx.doi.org/10.22233/9781910443439.62.1.

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Maheshwari, Nanda. "Packed Cell Volume." In Clinical Pathology, Hematology and Blood Banking (For DMLT Students), 197. Jaypee Brothers Medical Publishers (P) Ltd., 2017. http://dx.doi.org/10.5005/jp/books/12973_21.

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Kawthalkar, Shirish. "Packed Cell Volume." In Essentials of Clinical Pathology, 188. Jaypee Brothers Medical Publishers (P) Ltd., 2010. http://dx.doi.org/10.5005/jp/books/11417_19.

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Zingade, US. "Packed Cell Volume." In Manual of Practical Physiology, 179. Jaypee Brothers Medical Publishers (P) Ltd., 2007. http://dx.doi.org/10.5005/jp/books/10484_36.

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Zingade, US. "Chapter-36 Packed Cell Volume." In Anterior Segment Imaging in Ophthalmology, 179–80. Jaypee Brothers Medical Publishers (P) Ltd., 2007. http://dx.doi.org/10.5005/jp/books/10051_36.

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Sembulingam, K., and Prema Sembulingam. "Packed Cell Volume and Blood Indices." In Essentials of Medical Physiology, 86. Jaypee Brothers Medical Publishers (P) Ltd., 2012. http://dx.doi.org/10.5005/jp/books/11696_43.

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Conference papers on the topic "Packed cell volume (PCV)"

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Srinilta, Chutimet, Wisuwat Sunhem, Pongsak Sangunwong, and Satthathan Chanchartree. "Machine Learning Approach in Predicting Post-Transfusion Packed Cell Volume in Anemic Dogs." In 2018 International Conference on Engineering, Applied Sciences, and Technology (ICEAST). IEEE, 2018. http://dx.doi.org/10.1109/iceast.2018.8434471.

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Miley, G. H., C. Castano, A. Lipson, S. O. Kim, and N. Luo. "Progress in Development of a Low Energy Reaction Cell for Distributed Power Applications." In 10th International Conference on Nuclear Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/icone10-22148.

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Power units using Low Energy Nuclear Reactions (LENRs) potentially offer a radical new approach to power units that could provide distributed power units in the 1–50 kW range. As described in prior ICONE papers [9, 23] these cells employ thin metallic film cathodes (order of 500 Å, using variously Ni, Pd and Ti) with electrolytes such as 0.5–1 molar lithium sulfates in light water. Power densities exceeding 10 W/cc in the films have been achieved. An ultimate goal is to incorporate this thin-film technology into a “tightly packed” cell design where the film material occupies ∼ 20% of the total volume. If this is achieved, power densities of ∼20 W/cm3 appear feasible, opening the way to a number of potential applications involving distributed power. Recent studies reported here have concentrated on new electrode designs intended to maximize the proton loading in the films while maintaining the required proton and electron current densities.
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3

Ito, Kohei, Kensuke Ashikaga, Tomohiko Miyazaki, Hiroki Ohshima, Yasushi Kakimoto, Hiromitsu Masuda, Yoshiyuki Oie, and Kazunari Sasaki. "Estimation of Flooding in PEMFC Gas Diffusion Layer by Differential Pressure Measurement." In ASME 2006 4th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2006. http://dx.doi.org/10.1115/fuelcell2006-97251.

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The flooding, especially in gas diffusion layer (GDL), is one of the critical issues to put PEMFC to practical use. However, the experimental data of the flooding in GDL is so insufficient that the optimization design to solve the flooding problem in GDL has not established until now. In this study we show a method to estimate the water saturation, namely the water droplet occupation for unit volume in GDL. We fabricated a simple interdigitated cell where the supply gas is enforced to flow under rib. This structure made it possible to capture the water droplet in GDL with the measurement of differential pressure through the cell. We operated the cell and measured the differential pressure, and estimated the water saturation with assuming that the flow in GDL is Darcy flow and that the GDL can be treated as sphere packed bed. In addition to deferential pressure measurement, we measured the ionic resistance in polymer electrolyte membrane by AC impedance method. We evaluated the effect of the water saturation on the decrease of cell voltage.
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4

Nakagawa, Tadahiro, Naoki Shikazono, and Nobuhide Kasagi. "Numerical Simulation of Electrochemical Reaction in Reconstructed Three-Dimensional LSM/YSZ Composite Cathode." In ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/fuelcell2008-65027.

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In the present study, a novel computational scheme for the assessment of the activation polarization of LSM/YSZ composite cathodes is proposed. The scheme consists of modeling techniques of three-dimensional microstructures and an evaluation method of electrochemical characteristics. Two modeling techniques of microstructures are employed, i.e. the stochastic reconstruction (SR) method and the random packing model (RPM). In the SR method, the 3-D structure is reconstructed statistically from the two-point correlation function of the cross-sectional image of SEM-EDX. In RPM, on the other hand, spherical LSM and YSZ particles are randomly packed in the computational domain. This model is mainly used for the parametric survey, because control parameters used in the model have good correspondence to the parameters used in the actual cell manufacturing process. The lattice Boltzmann method coupled with the Butler-Volmer equation is employed for the detailed assessment of the electrochemical characteristics inside the constructed 3-D cathode microstructures. The oxygen diffusion and the electronic and ionic conductions are calculated simultaneously, and coupled with the charge transfer at the three-phase boundary (TPB) using the Butler-Volmer equation. As a result, potential, polarization and current density distributions are fully investigated. The results from the SR method reveal that the cathode sintered at 1150 °C shows the smaller overpotential than the cathodes sintered at 1200 and 1250 °C. The RPM results show that particle diameter and its standard deviation as well as volume fraction of species have large effects on the cathode performance.
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5

Herman, A. G., and H. Bult. "RED BLOOD CELL LYSIS MAY INFLUENCE PLATELET AGGREGATION IN WHOLE BLOOD AGGREGOMETER." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644552.

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The electronic whole blood aggregometer (WBA) has the advantage that it enables the study of platelet aggregation in whole blood shortly after blood collection. Using the WBA varying results have been obtained with respect to the anti-aggregating activity of dipyridamole. As dipyridamole is an efficient inhibitor of adenosine uptake, we tested whether the degree of red blood cell lysis (and thus availability of adenine nucleotides) affected its efficacy. Citrate (10.7 mM) blood was stored in sealed tubes and used between 20 and 100 min after venipuncture. One ml was placed in a Chronolog Model 540 WBA together with 10 μl 0.9 % NaCl, dipyridamole (final conc. 3, 10 or 30 μM) or its solvent (final conc. 0.03, 0.1 or 0.3 %). After reaching a stable baseline and WBA calibration, aggregation was induced by injection of 10 μM ADP dissolved in 10 μl 0.9 % NaCl (one channel) or 10 μl distilled water (other channel). Maximum impedance increase in 10 min was measured, red blood cells were removed by centrifugation, and from microhematocrit and absorbance at 416 nm the volume of lysed packed red blood cells was estimated. ADP caused aggregation (12.9 ± 1.9 and 11.1 ± 0.8, Ohm) and there was red blood cell lysis (2.8 ± 0.5 and 0.8 ± 0.2 μl red blood cells, ADP resp. in H20 and 0.9 % NaCF, n = 6). Dipyridamole (30 μM) suppressed aggregation when compared with solvent, but only when ADP was given in H20 (reduction resp. 4.4 ± 1.4 and 1.9 ± 1.6 ohm). Moreover, there was a negative correlation between the degree of haemolysis and the aggregation response at 10 as well as 30 μM dipyridamole. This reduced aggregation with increasing haemolysis was not observed in the presence of the corresponding solvent concentrations. The red blood cell lysis was proportional to the plasma ATP (luciferine-luciferase method) concentration as an index of adenine nucleotide leakage. In conclusion, a certain degree of haemolysis caused by stirring and injection with a microsyringe is inherent to the WBA, but use of hypotonic vehicles should be avoided. Release of red blood cell constituents may affect platelet aggregation as such, or interfere with the activity of adenosine uptake inhibitors and possibly other drugs. It may help to explain some of the variable results obtained with dipyridamole.
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Achar P. L., Sukshitha, Huanyu Liao, and Ganesh Subbarayan. "Comparative Evaluation of Algorithms for Achieving Ultrapacked Thermal Greases: Microstructural Models and Effective Behavior." In ASME 2019 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ipack2019-6501.

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Abstract As device power density increases, there is a need to dissipate generated heat by increasing particle volume loading in thermal interface materials. In this work, we develop and evaluate algorithms for generating ultrapacked microstructures of particles. Simulated microstructures reported in the literature rarely contain particle volume fractions greater than 60%. However, commercially available thermal greases claim to achieve volume fractions in the range of 60–80%. Therefore, to analyze effectiveness of commercially available particle-filled thermal interface materials, there is a need to develop algorithms capable of generating ultrapacked microstructures. The particle packing problem is initially posed as a nonlinear programming problem (NLP), and formal optimization algorithms are applied to generate microstructures that are maximally packed. Since accuracy of the simulated behavior is dependent on the number of particles in the simulation cell, efficiently simulating large number of particles is imperative. However, the packing simulation is computationally expensive. Therefore, various optimization algorithms are systematically evaluated to assess the computational efficiency as measured by the time to generate the microstructures for a system containing a large number of particles. The evaluated algorithms include the penalty function methods, best-in-class sequential programming method, matrix-less conjugate gradient method as well as the augmented Lagrangian method. In addition, heuristic algorithms are also evaluated to achieve computationally efficient packing. The evaluated heuristic algorithms are mainly based on the Drop-Fall-Shake method, but modified to more effectively simulate the mixing process in commercial planetary mixers. With the developed procedures, Representative Volume Elements (RVE) with volume fraction as high as 74% are demonstrated. The simulated microstructures are analyzed using our previously developed random network model to estimate the effective thermal and mechanical behavior given a particle arrangement.
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Burra, K. G., and A. K. Gupta. "Sorption Enhanced Steam Reforming of Propane Using Calcium Looping." In ASME 2017 Power Conference Joint With ICOPE-17 collocated with the ASME 2017 11th International Conference on Energy Sustainability, the ASME 2017 15th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2017 Nuclear Forum. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/power-icope2017-3621.

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Sorption enhanced steam reforming of propane over Ni catalyst using in-situ carbonation of CaO provides both carbon capture, and enhanced H2 content in the product gas, and enhanced carbon conversion efficiency. Choosing propane over methane for sorption enhanced reforming provides easier fuel handling capability and higher throughput of H2 per unit volume of fuel. Such advantages help in building domestic scale hydrogen production source for sustainable energy production. The effect of propane addition on CaO carbonation and poisoning possibilities in reformation integrated with CO2 capture is explored in a packed-bed reactor. The motivation of propane addition is to model petroleum gas to address the feasibility of carbon capture integration with hydrocarbon reforming processes. Initially, different partial pressures of steam and propane will be used to study the kinetic parameters in a fixed bed reactor at different temperatures. The formed kinetic models will be used to compare the integrated CO2 capture results and the thermodynamic results to evaluate the efficiencies of such process. Higher temperatures provide better conversion efficiency, but the equilibrium of CaO carbonation suggests steam reforming enhancement and CO2 capture needs to be below 1073 K in order to avoid the backward reaction of CaCO3 releasing CO2. The balance between endothermic reformation reaction and exothermic water-gas shift and CaO carbonation reactions is the optimizing parameter for improved conversion to high H2 content. Temperatures higher than 873 K provided higher conversion with lower CO2 capture and H2 content while lower than 873 K provided lower methane conversion and higher CO2 capture and H2 content. Increase in steam to carbon ratio increased CH4 conversion and reduced CO content without affecting sorption with no further reduction in CO2 observed for most of the sorption cycle. These results supplement the available data in the literature to provide superior reaction conditions to improve the process efficiency in hydrogen production.
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Martin, Claudia, Nils Breidenbach, and Markus Eck. "Screening and Analysis of Potential Filler Materials for Molten Salt Thermocline Storages." In ASME 2014 8th International Conference on Energy Sustainability collocated with the ASME 2014 12th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/es2014-6493.

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Solar thermal power plants are a promising option for future solar electricity generation. Their main advantage is the possibility to utilize integrated thermal storage capacities, allowing electricity generation on demand. In state of the art solar thermal power plants, two-tank molten-salt thermal energy storages are used. Significant cost reductions are expected by using thermocline thermal energy storage by storing the liquid storage material inside a single tank when compared to a two tank storage system. By embedding a low cost solid filler material inside the storage tank further cost reductions can be achieved. In earlier studies [1, 2] several potential filler materials have been investigated. In these study quartzite turned out to be a promising candidate due to its satisfying thermal stability and availability. At a temperature of approx. 573°C the crystal structure of quartzite changes from trigonal α-quartz phase to the hexagonal β-quartz phase [3]. This quartz conversion results in a volume change [4] that may cause cracking of the quartzite crystals due to weight loads in a packed bed. Since these thermal tests of the study mentioned were limited to 500°C this dunting was not considered. Thus, despite of the published studies there is a need for further, more detailed analysis. One trend in today’s development of solar thermal power plants is to use molten salt as storage material and heat transfer fluid at operating temperatures of 560°C and above. Accordingly, the quartz inversion might limit the applicability of quartzite as a filler material at elevated operating temperatures. Due to this concern, an investigation has been started to investigate the utilizability of natural rocks as low cost filler materials. In the first phase of this investigation a comprehensive literature survey was conducted. Based on this study, magmatic and sedimentary rocks turned out to the most promising rock classes for this application. For the further investigation, basalt was chosen as a suited representative for magmatic and quartzite for sedimentary rocks. In lab-scale tests, these candidate materials were investigated with respect to their: • Calcite content • Thermal stability up to 900°C in air • Thermal stability up to 560°C in molten salt • Cyclic stability between 290°C and 560°C in molten salt • Specific heat capacity up to 600°C In this paper the results of these investigations are presented and future activities are outlined.
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9

Jayson, Eric M., and Gregory R. Mathy. "Rapidly Deployable Lightweight Shelters for Austere Environments." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63721.

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An innovative solution for a rapidly deployable shelter for use in austere environments is presented in this paper. The design incorporates a self-erecting dome structure and a compressible, high R-value thermal barrier to enable rapid in-theatre deployment of personnel in harsh environmental conditions. The design concept presented in the paper was originally developed in response to the Army branch of the small business innovative research (SBIR) solicitation topic A11-099. The proposed 400 ft2 shelter meets the design goals of deployment by two people in 20 minutes, capability of withstanding 100 mph winds, and an R value of at least 15. These objectives have been proven via test, analysis, and mechanical demonstration of the key design components and systems. The primary structure consists of eight composite tubes. The tubes are slip-fit into a central hub; each member is similar to a spoke extending outward radially from the hub. A tension cable is run around the outer perimeter of the radial spokes, passing through a fitting at the tip of each spoke, and a protective skin is draped over the structural members. The structure is then elastically deformed via buckling into a dome-shaped structure by tensioning the cable. This allows quick, easy shelter erection from a single location by one person using a winch. The protective skin is then tensioned to the shelter base with adjustable straps. Stakes are not required to support the structure. A scale model of the primary structure was built to demonstrate the controlled buckling of the members to form the main structural components, and the scale model successfully demonstrated deployment in minimal time. A cellular fabric blanket, which uses entrapped air to provide a thermal barrier, is hung from the inside of the structure and is mechanically expanded to maintain the desired cell size. It can then be packed to 1/20th of its deployed volume for transportation. Simulations and tests were used to optimize the cell size and aspect ratio for weight, manufacturability, and R value. Analytical predictions and component-level testing have demonstrated that a system-level R value of 15 is achievable.
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