Thematische Bibliographien / Blood flows indices

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Auswahl der wissenschaftlichen Literatur zum Thema „Blood flows indices“

Autor: Grafiati

Veröffentlicht am 4. Juni 2021

Zuletzt aktualisiert am 20. Februar 2023

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Zeitschriftenartikel zum Thema "Blood flows indices"

Kang, Yang Jun. "Microfluidic-Based Biosensor for Sequential Measurement of Blood Pressure and RBC Aggregation Over Continuously Varying Blood Flows." Micromachines 10, no. 9 (August 30, 2019): 577. http://dx.doi.org/10.3390/mi10090577.

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Aggregation of red blood cells (RBCs) varies substantially depending on changes of several factors such as hematocrit, membrane deformability, and plasma proteins. Among these factors, hematocrit has a strong influence on the aggregation of RBCs. Thus, while measuring RBCs aggregation, it is necessary to monitor hematocrit or, additionally, the effect of hematocrit (i.e., blood viscosity or pressure). In this study, the sequential measurement method of pressure and RBC aggregation is proposed by quantifying blood flow (i.e., velocity and image intensity) through a microfluidic device, in which

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Browne, Vaughn A., Colleen G. Julian, Lillian Toledo-Jaldin, Darleen Cioffi-Ragan, Enrique Vargas, and Lorna G. Moore. "Uterine artery blood flow, fetal hypoxia and fetal growth." Philosophical Transactions of the Royal Society B: Biological Sciences 370, no. 1663 (March 5, 2015): 20140068. http://dx.doi.org/10.1098/rstb.2014.0068.

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Evolutionary trade-offs required for bipedalism and brain expansion influence the pregnancy rise in uterine artery (UtA) blood flow and, in turn, reproductive success. We consider the importance of UtA blood flow by reviewing its determinants and presenting data from 191 normotensive (normal, n = 125) or hypertensive (preeclampsia (PE) or gestational hypertension (GH), n = 29) Andean residents of very high (4100–4300 m) or low altitude (400 m, n = 37). Prior studies show that UtA blood flow is reduced in pregnancies with intrauterine growth restriction (IUGR) but whether the IUGR is due to res

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Bouhemad, Bélaïd, Fabio Ferrari, Kris Leleu, Charlotte Arbelot, Qin Lu, and Jean-Jacques Rouby. "Echocardiographic Doppler Estimation of Pulmonary Artery Pressure in Critically Ill Patients with Severe Hypoxemia." Anesthesiology 108, no. 1 (January 1, 2008): 55–62. http://dx.doi.org/10.1097/01.anes.0000296067.02462.34.

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Background In spontaneously breathing cardiac patients, pulmonary artery pressure (PAP) can be accurately estimated from the transthoracic Doppler study of pulmonary artery and tricuspid regurgitation blood flows. In critically ill patients on mechanical ventilation for acute lung injury, the interposition of gas between the probe and the heart renders the transthoracic approach problematic. This study was aimed at determining whether the transesophageal approach could offer an alternative. Methods Fifty-one consecutive sedated and ventilated patients with severe hypoxemia (arterial oxygen ten

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Kang, Yang. "A Disposable Blood-on-a-Chip for Simultaneous Measurement of Multiple Biophysical Properties." Micromachines 9, no. 10 (September 20, 2018): 475. http://dx.doi.org/10.3390/mi9100475.

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Biophysical properties are widely used to detect pathophysiological processes of vascular diseases or clinical states. For early detection of cardiovascular diseases, it is necessary to simultaneously measure multiple biophysical properties in a microfluidic environment. However, a microfluidic-based technique for measuring multiple biophysical properties has not been demonstrated. In this study, a simple measurement method was suggested to quantify three biophysical properties of blood, including red blood cell (RBC) deformability, RBC aggregation, and hematocrit. To demonstrate the suggested

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Toubaei, S. "Blood Flow of Carotid Arteries in Schizophrenic Patients." European Psychiatry 24, S1 (January 2009): 1. http://dx.doi.org/10.1016/s0924-9338(09)71439-7.

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Background:Based on new imaging, some results have led to the hypothesis, indicating left hemispheric dysfunction in schizophrenic patients,Transcranial color Doppler sonography also showed significant blood flow velocity changes in schizophrenic patients.Our study tried to clarify possible differences between carotid blood flow of each side, in symptom positive and symptom negative schizophrenic patients, as well as differences of blood flow between schizophrenic patients versus control cases.Methods:31 schizophrenic patients which had been selected randomly were divided in two separate group

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Tiederman, W. G., M. J. Steinle, and W. M. Phillips. "Two-Component Laser Velocimeter Measurements Downstream of Heart Valve Prostheses in Pulsatile Flow." Journal of Biomechanical Engineering 108, no. 1 (February 1, 1986): 59–64. http://dx.doi.org/10.1115/1.3138581.

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Elevated turbulent shear stresses resulting from disturbed blood flow through prosthetic heart valves can cause damage to red blood cells and platelets. The purpose of this study was to measure the turbulent shear stresses occurring downstream of aortic prosthetic valves during in-vitro pulsatile flow. By matching the indices of refraction of the blood analog fluid and model aorta, correlated, simultaneous two-component laser velocimeter measurements of the axial and radial velocity components were made immediately downstream of two aortic prosthetic valves. Velocity data were ensemble average

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Gelsomino, Sandro, Pieter Willem Lozekoot, Roberto Lorusso, Monique Maria de Jong, Orlando Parise, Francesco Matteucci, Fabiana Lucà, et al. "A New 35-mm Short Intra-aortic Balloon Catheter: A Suitable Option also for Non-Small-Sized Patients?" Innovations: Technology and Techniques in Cardiothoracic and Vascular Surgery 11, no. 1 (January 2016): 46–53. http://dx.doi.org/10.1097/imi.0000000000000233.

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Objective Visceral ischemia can be a potentially life-threatening complication of intra-aortic balloon pump (IABP) support. A shorter IABP catheter might lead to a reduction of visceral complications. In this animal study, we evaluate the effects of a 35-mL short catheter in comparison with a 40-mL standard-sized catheter. Methods Eighteen healthy swine underwent 120-minute ligation of the left anterior descending coronary artery followed by 6 hours of reperfusion being supported by either a short IABP catheter (short group) (n = 6) or a long IABP catheter (long group) (n = 6) or with no assis

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Mandolfo, S., F. Galli, S. Costa, P. Ravani, P. Gaggia, and E. Imbasciati. "Factors Influencing Permanent Catheter Performance." Journal of Vascular Access 2, no. 3 (July 2001): 106–9. http://dx.doi.org/10.1177/112972980100200304.

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Permanent dual lumen catheters (PDLC) provide an alternative vascular access in patients considered unsuitable for arteriovenous fistula, graft or peritoneal dialysis. However, the use of PDLC is often complicated by inadequate blood flow. The aim of this study was to identify catheter dysfunctions. We studied prospectively 57 chronic hemodialyzed patients, 73±11 years of age, with PDLC for 18±14 (1–48) months. Catheters were tunneled in silicone (MedComp Tesio n= 40) or in polyurethane (Permcath Quinton n = 11, GamCath Gambro n = 6) in left or right internal jugular (n = 49), in left or right

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Hazari, Vajihe, Fatemeh Sarvi, Ashraf Alyasin, Marzieh Agha-Hosseini, and Sedigheh Hosseinimousa. "Effectiveness the perfusion of Endometrial and Subendometrial and Endometrial volume on the endometrial receptivity of FET Cycles." Obstetrics Gynecology and Reproductive Sciences 5, no. 7 (September 25, 2021): 01–06. http://dx.doi.org/10.31579/2578-8965/067.

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Objective: this study was effects of endometrial and subendometrial blood perfusion and endometrial volume on endometrial receptivity in frozen embryo transfer (FET) cycles. Materials and methods: This prospective observational cohort study, that on infertile women who referred for FET to Shariati Hospital and Omid Infertility Clinic in Tehran (Iran) .112 patients selected among eligible women with good quality embryos. After homogenization, participants underwent endometrial preparation for hormone replacement therapy (HRT) according to a similar routine protocol. On the day of the FET, they

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Nestola, Maria G. C., Alessio Gizzi, Christian Cherubini, and Simonetta Filippi. "Three-band decomposition analysis in multiscale FSI models of abdominal aortic aneurysms." International Journal of Modern Physics C 27, no. 02 (December 23, 2015): 1650017. http://dx.doi.org/10.1142/s0129183116500170.

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Computational modeling plays an important role in biology and medicine to assess the effects of hemodynamic alterations in the onset and development of vascular pathologies. Synthetic analytic indices are of primary importance for a reliable and effective a priori identification of the risk. In this scenario, we propose a multiscale fluid-structure interaction (FSI) modeling approach of hemodynamic flows, extending the recently introduced three-band decomposition (TBD) analysis for moving domains. A quantitative comparison is performed with respect to the most common hemodynamic risk indicator

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Dissertationen zum Thema "Blood flows indices"

Kumar, Hemant, University of Western Sydney, and of Science Technology and Environment College. "Software analytical tool for assessing cardiac blood flow parameters." THESIS_FSTA_XXX_Kumar_H.xml, 2001. http://handle.uws.edu.au:8081/1959.7/392.

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Introduction of Doppler ultrasound techniques into the Intensive Care setting has revolutionised the way haemodynamic status is monitored in the critically ill. However, in order to increase the usefulness of these techniques, the Doppler signal and its spectrum need to be further analysed in ways to facilitate a better clinical response. Extensive processing of the Doppler spectrum on Diagnostic ultrasound machines is limited by the real time performance considerations. It was therefore proposed that the spectral information from these systems be extracted off-line and full set of analytical

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Kumar, Hemant. "Software analytical tool for assessing cardiac blood flow parameters." Thesis, View thesis, 2001. http://handle.uws.edu.au:8081/1959.7/392.

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Machado, Maria Virginia Lima. "Doppler blood flow indices in fetal and early neonatal life." Thesis, King's College London (University of London), 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.689608.

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Reinerman, Lauren E. Ph D. "Cerebral Blood Flow Velocity and Stress Indices as Predictors of Cognitive Vigilance Performance." University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1212092469.

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França, Itamara Gomes de. "Efeito do escore do trato reprodutivo na dinâmica folicular e dopplerfluxometria útero-ovariana em novilhas nelore (Bos indicus)." Universidade Federal do Maranhão, 2016. http://tedebc.ufma.br:8080/jspui/handle/tede/1697.

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Submitted by Rosivalda Pereira (mrs.pereira@ufma.br) on 2017-06-26T17:30:38Z No. of bitstreams: 1 ItamaraFranca.pdf: 611104 bytes, checksum: 4827358f1120e6b66cf862bb0635763f (MD5) Made available in DSpace on 2017-06-26T17:30:38Z (GMT). No. of bitstreams: 1 ItamaraFranca.pdf: 611104 bytes, checksum: 4827358f1120e6b66cf862bb0635763f (MD5) Previous issue date: 2016-08-31 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Fundação de Amparo à Pesquisa e ao Desenvolvimento Científico e Tecnológico do Maranhão (FAPEMA) The objective of this study was to evaluate the ef

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Papievienė, Vilma. "Peculiarities of concatenation between cardiovascular functional indices while performing increasing workload up to inability to continue the task." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20140520_085358-54570.

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Since the analysis of dynamics of intervals of short cardiovascular signals reflects important vital processes, involving complex interactions of the regulatory processes (Batzel, Bachar, 2010), mathematical formalism is one of the ways to research the complexity of biological systems (Davis et al., 2010). Concerning the interaction of various physiological systems / parameters that point out the causes of fatigue, the theory of non-linear dynamical systems enables to reveal this phenomenon as a part of dynamic system’s processes. Cardiovascular functional values are integral indicators, i.e

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Gargano, Ronaldo Gomes. "Ultrassonografia Doppler do fluxo arterial digital associado à alteração do coxim digital dos bovinos." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/10/10136/tde-07102015-105755/.

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O objetivo do estudo foi avaliar, por meio da ultrassonografia bidimensional e da ultrassonografia Doppler, as inter-relações entre a alteração de espessura do coxim digital com os índices vasculares da artéria digital dorsal comum dos membros pélvicos dos bovinos. A avaliação ultrassonográfica Doppler é uma técnica não invasiva de avaliação de índices vasculares, assim como, indiretamente, do volume de sangue do leito vascular. Para isso, foram realizados exames ultrassonográficos da espessura do coxim digital e também avaliação ultrassonográfica Doppler da referida artéria de 13 vacas primíp

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Jouette, Christian. "Conception d'un appareil de mesure du débit sanguin tissulaire par effet doppler optique : choix des paramètres d'échantillonnage et d'analyse spectrale, et détermination d'un indice débit métrique." Nancy 1, 1994. http://www.theses.fr/1994NAN10106.

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La mesure du débit sanguin tissulaire par effet doppler optique est une idée séduisante. L'utilisation d'une source laser, par la cohérence spatiale et géométrique qu'elle offre, en simplifie la réalisation pratique. La vitesse des différentes composantes, notamment les hématies, n'est pas uniforme. Il en résulte donc une distribution spectrale image de cette répartition. De plus, l'environnement du faisceau laser étant constitué par de la matière vivante, de nombreux paramètres influencent les résultats. Dans un premier temps, nous décrivons l'évolution des doppler-lasers, et nous exposons le

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Bücher zum Thema "Blood flows indices"

The River of blood flows on. Toronto: Published by Rojo Nuevo Collective/Red Tree in association with A Space, 1992.

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Kellum, John A. Diagnosis of oliguria and acute kidney injury. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0212.

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Diagnosis and classification of acute pathology in the kidney is major clinical problem. Azotemia and oliguria represent not only disease, but also normal responses of the kidney to extracellular volume depletion or a decreased renal blood flow. Clinicians routinely make inferences about both the presence of renal dysfunction and its cause. Pure prerenal physiology is unusual in hospitalized patients and its effects are not necessary benign. Sepsismay alter renal function without the characteristic changes in urine indices. The clinical syndrome known as acute tubular necrosis does not actuall

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Buchteile zum Thema "Blood flows indices"

Obrist, W. D., and W. E. Wilkinson. "Stability and Sensitivity of CBF Indices in the Noninvasive 133Xe Method." In Cerebral Blood Flow and Metabolism Measurement, 30–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-70054-5_4.

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Piechnik, Stefan, M. Czosnyka, P. Smielewski, and J. D. Pickard. "Indices for Decreased Cerebral Blood Flow Control — A Modelling Study." In Intracranial Pressure and Neuromonitoring in Brain Injury, 269–71. Vienna: Springer Vienna, 1998. http://dx.doi.org/10.1007/978-3-7091-6475-4_78.

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Ciccarelli, Giovanni, Emanuele Barbato, and Bernard De Bruyne. "Fractional flow reserve." In State of the Art Surgical Coronary Revascularization, edited by David P. Taggart, John D. Puskas, and Mario Gaudino, 63–67. Oxford University Press, 2021. http://dx.doi.org/10.1093/med/9780198758785.003.0017.

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Fractional flow reserve is an index of the physiological significance of a coronary stenosis, defined as the ratio of maximal myocardial blood flow in the presence of the stenosis to the theoretically normal maximal myocardial blood flow (i.e. in the absence of the stenosis). This flow ratio can be calculated from the ratio of distal coronary pressure to central aortic pressure during maximal hyperaemia. More practically, fractional flow reserve indicates to what extent the epicardial segment can be responsible for myocardial ischaemia and, accordingly, fractional flow reserve quantifies the expected perfusion benefit from revascularization by percutaneous coronary intervention. Very limited evidence exists on the role on fractional flow reserve for bypass grafts.

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Alexis-Ruiz, Adrian, and Marisa Cevasco. "Right Ventricular Assist Device Therapies." In Cardiothoracic Critical Care, 215–20. Oxford University Press, 2020. http://dx.doi.org/10.1093/med/9780190082482.003.0022.

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This chapter discusses right ventricular assist device (RVAD) therapies. Current RVAD options include the Impella Right Peripheral, the Tandem Heart, the Protek Duo system, and a surgically placed CentriMag RVAD. Important considerations when choosing a device include operator familiarity, the need for an oxygenator, the availability of a surgeon, and specific contraindications such as severe tricuspid regurgitation, an occluded internal jugular vein, or the presence of an inferior vena cava filter. It is important to consider the hemodynamic effects on the left ventricle (LV) after placement of an RVAD. Identifying biventricular failure early is critical when RVAD implantation is considered. RVADs reduce right atrial pressure, increase flow through the pulmonary arteries, and increase LV preload and wedge pressure. This change in preload may worsen LV function and cause pulmonary edema in patients with LV failure. LV assist device revolutions per minute may need to increase after placement of an RVAD to manage increased flow to the LV. Ultimately, assessing changes in oxygen saturation, blood pressure, and echocardiographic indices can guide hemodynamic management of RVAD therapy.

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Morrell, Nicholas W. "Pulmonary hypertension." In Oxford Textbook of Medicine, edited by Jeremy Dwight, 3695–710. Oxford University Press, 2020. http://dx.doi.org/10.1093/med/9780198746690.003.0374.

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Symptoms of unexplained exertional breathlessness or symptoms out of proportion to coexistent heart or lung disease should alert the clinician to the possibility of pulmonary hypertension, and the condition should be actively sought in patients with known associated conditions, such as scleroderma, hypoxic lung disease, liver disease, or congenital heart disease. Heterozygous germ-line mutations in the gene encoding the bone morphogenetic protein type II receptor (BMPR2) are found in over 70% of families with pulmonary arterial hypertension. Pulmonary hypertension is defined as a mean pulmonary arterial pressure greater than 25 mm Hg at rest, and may be due to increased pulmonary vascular resistance (e.g. pulmonary arterial hypertension), increased transpulmonary blood flow (e.g. congenital heart disease), or increased pulmonary venous pressures (e.g. mitral stenosis). Exercise tolerance and survival in pulmonary hypertension is ultimately related to indices of right heart function, such as cardiac output.

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Singha, Radhika. "Making the Desert Bloom?" In The Coolie's Great War, 95–158. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780197525586.003.0004.

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World War one witnessed the first dense flow of Indian labor into the Persian Gulf. To reconstruct the campaign in Mesopotamia/Iraq after the reverses of 1915-16, the Indian Army demanded non-combatants for dock-work, construction labor and medical and transport services. This chapter explores the Government of India’s anxious deliberations about the choice of legal form in which to meet this demand. The sending of labor for military work overseas had to be distanced conceptually from the stigmatized system of indentured labor migration. There was a danger of disrupting those labor networks across India and around the Bay of Bengal which maintained the supply of material goods for the war. Non-combatant recruitment took the war into new sites and spaces. Regimes of labor servitude were tapped but some form of emancipation had to be promised. The chapter focusses on seven jail- recruited Indian Labor and Porter Corps to explore the work regime in Mesopotamia. Labor units often insisted on fixed engagements rather than ‘duration of war’ agreements, but had to struggle for exit at the conclusion of their contract. After the Armistice, Britain still needed Indian labor and troops in Mesopotamia but sought to prevent the emergence of a settler population.

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Oldroyd, Keith G., and Colin Berry. "Invasive functional evaluation." In ESC CardioMed, edited by William Wijns, 1354–60. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198784906.003.0333.

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Based on an understanding of how a stenosis impacts the ability of a coronary artery to deliver adequate myocardial blood flow, coupled with the results of the DEFER, FAME, and FAME 2 studies, fractional flow reserve (FFR) has become the most widely used and the only guideline-recommended method for the invasive functional evaluation of patients with stable ischaemic heart disease. The absolute value of FFR predicts prognosis and when treatment decisions are made or modified in response to the FFR value, clinical outcomes are improved. Major adverse cardiovascular event rates related to lesions deferred for revascularization on the basis of non-ischaemic FFR results are low. When compared to FFR, resting (non-hyperaemic) indices of physiological stenosis severity such as resting Pd/Pa or instantaneous wave-free ratio are associated with misclassification of 20% of lesions using binary cut-off values and 10% of lesions when hybrid strategies are used. Nevertheless, in low-risk patient populations, randomized clinical trials comparing instantaneous wave-free ratio versus FFR-guided management have shown non-inferiority. A comprehensive invasive assessment of patients with stable ischaemic heart disease requires an evaluation of microvascular dysfunction most commonly obtained by measuring the index of microcirculatory resistance. Patients with non-ischaemic FFR values but an elevated index of microcirculatory resistance have an increased incidence of adverse events.

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Erbel, Raimund. "Aortic sclerosis: therapy." In ESC CardioMed, edited by Raimund Erbel, 2583–89. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198784906.003.0613.

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Aortic sclerosis is a very common disease and is related to the atherosclerotic process which can start in young adulthood. The loss of compliance of the aortic ‘Windkessel’ is a major drawback of the disease, leading to enhanced blood pressure amplitude—elevated pulse pressure—due to a higher systolic and a lower diastolic blood pressure. The pressure pulse wave augmentation index and the pulse wave velocity increase. Ultrasound is able to visualize only limited aortic segments, whereas computed tomography and magnetic resonance imaging are the best tools to detect and quantify aortic atheromas. Nevertheless, transoesophageal echocardiography can image the descending thoracic aorta down to the coeliac trunk. An aortic atheroma, particularly one greater than 4 mm in size in the aortic arch, indicates an increased risk of stroke and other cardiovascular events. A grading is helpful. Plaque rupture is quite frequent and often found in multiple segments of the aorta indicating an increased risk of cholesterol emboli due to the wash-out of debris with or without thrombotic material. Free-floating structures, possible remnants of fibrous cap, are found as well as mobile thrombi. Calcification of the thoracic aorta is often found when coronary artery calcification is present, but may be present when coronary artery calcification is absent. Risk prediction of events is, however, not improved. Therapy for aortic sclerosis is based on common and recent guidelines for prevention and treatment of risk factors. Endovascular or surgical interventions are limited to rare situation in which blood flow is not preserved.

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Lynch, Bryan E. "The ReliantHeart aVAD©." In Mechanical Circulatory Support, 103–9. Oxford University Press, 2019. http://dx.doi.org/10.1093/med/9780190909291.003.0015.

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The ReliantHeart aVAD© is a new intraventricular axial flow pump with pumping components that fit within the inflow cannula of the ventricular assist device (VAD). The aVAD© is an improvement over its predecessor, the extra-ventricular HeartAssist5 (HA5)™. The pumping components, inflow guide vane, impeller, and diffuser of the aVAD© are identical to those in the HA5, which in turn were derived from the original collaboration between Baylor College of Medicine and NASA. The current device provides excellent physiologic support for patients in end-stage heart failure and provides advanced ultrasonic flow measurements and performance data for wireless remote monitoring. In 2011 and 2012, the aVAD© was used successfully in calf studies as an artificial heart, with each ventricle being replaced by a modified HA5 VAD©. The two predecessor aVADs© were placed vertically, side by side, which provided a more compact total artificial heart with formable outflow graft protectors directed to the aorta and pulmonary artery. An ultrasonic flow probe accurately measures flow under all conditions, even in implants in place for years. The probe indicates flow in the range of –4 to +10 L/min with >95% accuracy. The probe can determine the relative contributions of the LVAD and native heart to adequate blood flow. The aVAD© meets the safety standards of the European Union and is sold in Europe. The aVAD is not yet available in the United States but is being tested under an FDA investigational device exemption.

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"39 Effect of Menopausal Status and Hormone Replacement on Therapy Resistance Indices and Blood Flow Velocities in Breast Tumors." In Color Doppler Sonography in Gynecology and Obstetrics, edited by Werner O. Schmidt and Asim Kurjak. Stuttgart: Georg Thieme Verlag, 2005. http://dx.doi.org/10.1055/b-0034-87352.

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Konferenzberichte zum Thema "Blood flows indices"

Saldaña, Charles Huamani, William Bayona Pancorbo, Víctor Oré Montalvo, Carlos Pérez Alviz, Juan Carlos Acuña Mamani, Golda Córdova Heredia, Paulina Damián-Saavedra, et al. "Preliminary correlation between blood viscosity and pulsatility index in healthy population resident at high altitude (Cusco 3300 masl)." In XIII Congresso Paulista de Neurologia. Zeppelini Editorial e Comunicação, 2021. http://dx.doi.org/10.5327/1516-3180.454.

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Background: Viscosity affects flows by increasing resistance to movement, therefore, blood viscosity (BV) could modify the pulsatility index (PI). Objectives: To determine the correlation between BV and PI. Design and setting: A cross-sectional study was conducted in clinically healthy young adults residing in Cusco (a city located at 3399 masl). Methods: A venous blood sample was taken to determine their BV levels, and a transcranial Doppler of right middle cerebral artery (R-MCA) was performed, with which the min, maximum and mean flow velocity (MFV), resistance and pulsatility indices (PI)

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Hao, Zhili. "Relations of Radial Vibration of the Arterial Wall to Pulsatile Parameters in Blood Flow for Extraction of Arterial Indices." In ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-95084.

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Abstract In light of the utility of radial vibration of the arterial wall for clinical values, this paper presents a theoretical study on the relations of radial vibration of the arterial wall to pulsatile parameters in blood flow. Pulse wave propagation in an artery is formulated as a combination of the governing equations of blood flow and the arterial wall and no-slip conditions at the blood-wall interface. A free wave propagation analysis is conducted on the problem to obtain the wave velocity and the theoretical expressions for blood flow rate and arterial radial displacement in terms of

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Ito, Kenichi, Yuki Kourakata, and Yu Hotta. "Muscle fatigue detection during dynamic contraction under blood flow restriction: Improvement of detection sensitivity using multivariable fatigue indices." In 2015 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2015. http://dx.doi.org/10.1109/embc.2015.7319778.

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Das, Ashish, William M. Gottliebson, Janaka Wansapura, and Rupak K. Banerjee. "Development of a Methodology for Direct Utilization of Phase-Contrast MRI in Hemodynamic Computations." In ASME 2011 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2011. http://dx.doi.org/10.1115/sbc2011-53959.

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Development of non-invasive diagnostic indices often requires accurate blood-flow calculation using physiologically realistic velocity profiles as boundary conditions. In this research, a methodology is being developed and validated that can directly use phase-contrast MR imaging (PC-MRI) based velocity measurement to perform blood-flow computation with patient-specific geometry. Using this methodology, the pressure drop can also be calculated non-invasively. Although the main focus of our research has been pulmonary insufficiency (PI) in tetralogy patients, our method can be employed in many

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Retarekar, Rohini, Manasi Ramachandran, and Raghavan L. Madhavan. "Correlation Among Hemodynamic and Morphological Metrics of Intracranial Aneurysms." In ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80708.

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There is increasing interest in assessing metrics of blood flow characteristics as prognostic indicators of rupture risk in intracranial aneurysms. Aneurysmal hemodynamics may be and has been quantified in the literature by numerous indices (about 18, to the best of our knowledge) each capturing some characteristic of flow. But are all these indices capturing unique characteristics of flow or are many of them redundant? And are they mainly proxies for basic morphological characteristics? Answering this question and identifying the indices that capture unique aspects of flow has practical impli

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Chaudhari, Krunal, and Hardikkumar Patel. "Hemodynamics Numerical Simulation of Stenosis Bifurcation." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51072.

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The main purpose of this research is to analyze blood flow in various scenarios such as 20%, 50% and 80% blockage in blood vessel due to aortic atherosclerosis. Valuable Information for clinical diagnosis of cardiovascular diseases can be obtained by analyzing the behavior of blood flow and its variations. An idealized numerical model of the human bifurcated aorta is created then simulations of steady blood flow were performed on this model and various parameters have been considered. The model parameters include the blood flow velocity, pressure, wall shear stress (WSS) of vessels, constant b

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Bhavsar, Sonya S., William B. Moskowitz, and Amy L. Throckmorton. "Mechanical Assistance for the Fontan Circulation Using an Intravascular Axial Flow Blood Pump." In ASME 2010 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2010. http://dx.doi.org/10.1115/sbc2010-19154.

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Research indicates that an afterload reducing agent improves ventricular-vascular interactions and Fontan hemodynamics [1]. Few such therapeutic alternatives exist for the failing Fontan patient beyond conventional pharmacologic therapy. To address this need for therapeutic options, we are developing an intravascular, magnetically levitated axial flow blood pump to support the total cavopulmonary connection (TCPC) of a failing Fontan in adolescent and adult patients [1,2]. Our pump is designed to provide mechanical pressure augmentation of blood flow from the inferior vena cava (IVC) to the lu

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Shida, Shuya, Hiroyuki Kosukegawa, and Makoto Ohta. "Development of a Methodology for Adaptation of Refractive Index Under Controlling Kinematic Viscosity for PIV." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64388.

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Blood vessel diseases such as ischemic cardiac disease or cerebral aneurysm are life-threatening disorders and as large a cause of death as cancer in many countries. The rupture of a cerebral aneurysm usually causes subarachnoidal hemorrhage the mortality of which is very high. Previous studies have proved that the genesis and growth of aneurysm are related to hemodynamics. Especially, in endovascular therapy for cerebral aneurysms using medical devices such as coils or stents, hemodynamics in an aneurysm are related to thrombosis formation in the aneurysm and to its repair. In vascular resear

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Kim, Soyoon, Kyoungchul Ro, and Hong Sun Ryou. "Numerical Investigation for the Effect of Blood Flow Rate and Asymmetric Bifurcation Angle on the Anterior Circulation Aneurysm Formation." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-19009.

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Most of aneurysms in the cranial cavity occur at the bifurcation of anterior circulation system. A cerebral aneurysm is easily ruptured, and it is fatal for most patients. Generally it is known that aneurysm occurs when arterial wall is deformed by high pressure or high wall shear stress (WSS). A blood flow pattern and the geometry and the blood vessel are important factors for aneurysm formation and the location. The transient interaction between blood flow and the arterial wall affects for simulating deformation of the blood vessel. Thus, numerical analysis is performed for various bifurcati

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Otani, Tomohiro, Satoshi Ii, Toshiyuki Fujinaka, Masayuki Hirata, Junko Kuroda, Katsuhiko Shibano, and Shigeo Wada. "Development of a Virtual Coil Model for Blood Flow Simulation in Coil-Embolized Aneurysms." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64435.

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Hemodynamics is considered to be one of the indices to evaluate the effects of the treatment by coil embolization for cerebral aneurysms. For the sake of detailed analysis of hemodynamics in coil-embolized aneurysms, we develop a virtual coil model based on the mechanical theory that the coil deforms toward minimizing the elastic energy, and represent a realistic configuration of the embolized coils in the aneurysm by the insertion simulation. Then, the blood flow analysis is done by solving the N.S. and continuity equations numerically with the finite volume method using polyhedral mesh. The

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