Search Results - "Barra, J. G."

Arterial Wall Mechanics in Conscious Dogs: Assessment of Viscous, Inertial, and Elastic Moduli to Characterize Aortic Wall Behavior by Armentano, Ricardo Luis, Barra, Juan Gabriel, Levenson, Jaime, Simon, Alain, Pichel, Ricardo Horacio

“…To evaluate arterial physiopathology, complete arterial wall mechanical characterization is necessary. This study presents a model for determining the elastic…”
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Experimental and clinical validation of arterial diameter waveform and intimal media thickness obtained from B-mode ultrasound image processing by Graf, S, Gariepy, J, Massonneau, M, Armentano, R L, Mansour, S, Barra, J G, Simon, A, Levenson, J

“…A new automated computerized system (IôTEC) that assesses concomitantly the instantaneous temporal arterial diameter and intimal media thickness (IMT) obtained…”
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Assessment of Smooth Muscle Contribution to Descending Thoracic Aortic Elastic Mechanics in Conscious Dogs by Barra, Juan Gabriel, Armentano, Ricardo Luis, Levenson, Jaime, Cabrera Fischer, Edmundo I, Pichel, Ricardo Horacio, Simon, Alain

“…Early investigators found contradictory evidence that vascular smooth muscle activation reduces the elastic modulus of the arterial wall under isotonic…”
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Assessment of elastin and collagen contribution to aortic elasticity in conscious dogs by Armentano, R L, Levenson, J, Barra, J G, Fischer, E I, Breitbart, G J, Pichel, R H, Simon, A

“…The elastic behavior of total elastin (EE) and collagen (EC) and the recruitment of collagen fibers (FC) supporting wall stress at a given transmural pressure…”
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In vivo angiotensin II receptor blockade and converting enzyme inhibition on canine aortic viscoelasticity by Barra, J G, Levenson, J, Armentano, R L, Cabrera Fischer, E I, Pichel, R H, Simon, A

“…The influence of the renin-angiotensin system (RAS) on the aortic wall mechanical properties under angiotensin I converting enzyme inhibition (enalaprilat, 0.3…”
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Cryografts implantation in human circulation would ensure a physiological transition in the arterial wall energetics, damping and wave reflection by Bia, D, Barra, J G, Armentano, R L, Zócalo, Y, Pérez, H, Saldías, M, Alvarez, I, Cabrera Fischer, E I

“…Each artery conduces blood (conduit function, CF) and smoothes out the pulsatility (buffering function, BF), while keeping its wall protected against the high…”
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Fractal dimension as an index of left ventricular ischaemia: a pilot study by Cymberknop, L J, Legnani, W, Barra, J G, Pessana, F M, Armentano, R L

“…Myocardial perfusion is performed by the left and the right coronary arteries, which deliver blood to the left and right ventricles, respectively. The…”
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Identification of arterial wall dynamics in conscious dogs by Gamero, Lucas G., Armentano, Ricardo L., Barra, Juan G., Simon, Alain, Levenson, Jaime

“…Viscoelastic properties determine the dynamic behaviour of the arterial wall under pulsatile pressure and flow, suggesting time- or frequency-dependent…”
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Carotid wall viscosity increase is related to intima-media thickening in hypertensive patients by ARMENTANO, R. L, GRAF, S, BARRA, J. G, VELIKOVSKY, G, BAGLIVO, H, SANCHEZ, R, SIMON, A, PICHEL, R. H, LEVENSON, J

“…Increases in arterial wall viscosity and intima-media thickness (IMT) were found in hypertensive patients. Because smooth muscle cells are responsible for the…”
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Inconsistency of the slope and the volume intercept of the end-systolic pressure-volume relationship as individual indexes of inotropic state in conscious dogs: presentation of an index combining both variables by CROTTOGINI, A. J, WILLSHAW, P, BARRA, J. G, ARMENTANO, R, CABRERA FISCHER, E. I, PICHEL, R. H

“…We tested the ability of the slope (Emax) and the volume intercept (Vo) of the end-systolic pressure-volume relationship (ESPVR) to indicate contractility…”
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Paradoxically Decreased Aortic Wall Stiffness in Response to Vitamin D3-Induced Calcinosis: A Biphasic Analysis of Segmental Elastic Properties in Conscious Dogs by Fischer, Edmundo I.Cabrera, Armentano, Ricardo L, Levenson, Jaime, Barra, Juan G, Morales, María C, Breitbart, Gustavo J, Pichel, Ricardo H, Simon, Alain

“…We studied the aortic elastic behavior in response to vitamin D3-induced accelerated calcinosis in conscious dogs chronically instrumented with a pressure…”
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Preventive effect of chronic converting enzyme inhibition on aortic stiffening induced by renovascular hypertension in conscious dogs by Fischer, E I, Levenson, J, Barra, J G, Armentano, R L, Pichel, R H, Simon, A

“…The aim was to assess the influence of the renin-angiotensin system on the geometrical and elastic properties of the aorta in conscious dogs, using a model of…”
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The contractile mechanism as an approach to building left ventricular pump models by Negroni, J A, Lascano, E C, Barra, J G, Crottogini, A J, Pichel, R H

“…The aim was to construct a model linking a simplified interpretation of the contractile process at the myofilament level to the mechanical behaviour of the…”
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End-systolic pressure-volume relationships in dogs during ventilation with PEEP by Crottogini, A J, Willshaw, P, Barra, J G, Breitbart, G J, Pichel, R H

“…Whether left ventricular (LV) contractility changes during ventilation with positive end-expiratory pressure (PEEP) remains controversial. To assess LV…”
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Left ventricular end-systolic elastance is incorrectly estimated by the use of stepwise afterload variations in conscious, unsedated, autonomically intact dogs by CROTTOGINI, A. J, WILLSHAW, P, BARRA, J. G, PICHEL, R. H

“…End-systolic elastance (Ees), the slope parameter of the end-systolic pressure (ESP)-volume (ESV) relation (ESPVR), is usually estimated in patients by…”
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Differential effects of left anterior descending coronary occlusion on left and right ventricular anterior wall thickening in the conscious pig by Crottogini, A J, Willshaw, P, Barra, J G, Lascano, E C, Pichel, R H

“…In humans, the left anterior descending coronary artery supplies the left ventricular wall, anterior septum and the paraseptal part of the right ventricular…”
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Single-beat evaluation of left ventricular inotropic state in conscious dogs by Lascano, E C, Negroni, J A, Barra, J G, Crottogini, A J, Pichel, R H

“…Two competing left ventricular elastic-resistive (ER) models were used to predict parameter values from pressure, volume, and time data of a single ejective…”
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Interventricular coronary steal induced by stenosis of left anterior descending coronary artery in exercising pigs by CROTTOGINI, A. J, GUTH, B. D, BARRA, J. G, WILLSHAW, P, LASCANO, E. C, PICHEL, R. H

“…In pigs and humans, the left anterior descending coronary artery (LAD) supplies the left ventricular anterior wall (LVAW), anterior septum, and paraseptal band…”
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A patient-specific method for the evaluation of wall shear stress in human coronary arteries by Salvucci, F P, Perazzo, C A, Gurfinkel, E, Armentano, R L, Barra, J G

“…Atherosclerotic plaques form at specific sites of the arterial tree, an observation that has led to the "geometric risk factor" hypothesis for atherogenesis…”
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Effect of long-term oral nisoldipine on infarct size and collateral development in pigs undergoing gradual occlusion of the left circumflex artery by Crottogini, A J, Lascano, E C, Barra, J G, Morales, M C, Depaoli, J R, Pichel, R H

“…We examined the effects of nisoldipine on infarct size and collateral development in pigs, whose coronary circulation is similar to that of humans, using an…”
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