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Estimation of Stroke Volume and Stroke Volume Changes by Electrical Impedance Tomography
Anesthesia & Analgesia, 2018BACKGROUND: Electrical impedance tomography (EIT) is a noninvasive imaging method that identifies changes in air and blood volume based on thoracic impedance changes. Recently, there has been growing interest in EIT to measure stroke volume (SV).
Fernando José, da Silva Ramos +5 more
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Exercise stroke volume relative to plasma-volume expansion
Journal of Applied Physiology, 1988The effects of plasma-volume (PV) expansion on stroke volume (SV) (CO2 rebreathing) during submaximal exercise were determined. Intravenous infusion of 403 +/- 21 ml of a 6% dextran solution before exercise in the upright position increased SV 11% (i.e., 130 +/- 6 to 144 +/- 5 ml; P less than 0.05) in untrained males (n = 7). Further PV expansion (i.e.
M K, Hopper, A R, Coggan, E F, Coyle
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Measurement of stroke volume with impedance cardiography
Clinical Physiology, 1982Summary. Simultaneous determination of stroke volume with impedance cardiography and the dye dilution technique was compared in 11 healthy men before and after exercise. The correlation coefficient for all measurements was 0·82. Mean stroke volume determined by impedance cardiography was significantly (P<0·001) lower than mean stroke volume ...
I, Milsom +3 more
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Nongeometric Doppler stroke volume determination
The American Journal of Cardiology, 1989Abstract Accurate noninvasive measurement of cardiac output is a long-sought goal with obvious advantages. Numerous methods have yielded varying success. Recent Doppler echocardiographic studies have produced promising results. 1,2 These studies depend on geometric measurements, that is, the cross-sectional flow area of a valve or vessel.
D H, Spodick, H, Koito
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An evaluation of computed stroke volume in man
American Heart Journal, 1966Abstract Data for validation in man of a method for determining continuous cardiac output are presented. Seventy-three points of comparison between a Fick or dye-dilution value and a value computed from the pressure pulse in the ascending aorta give a correlation coefficient of 0.90.
W B, Jones, R O, Russell, D H, Dalton
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Relationship between stroke volume and pneumocardiogram
Journal of Applied Physiology, 1982The intratracheal pressure oscillations produced by the heartbeat, called the pneumocardiogram, were recorded in 15 dogs. It was found that a linear relationship existed between the amplitude of the major negative deflection of the pneumocardiogram and the cardiac stroke volume, the latter determined either by indicator dilution (avg r = 0.94) or by ...
J L, Heckman +3 more
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Stroke volume equation for impedance cardiography
Medical & Biological Engineering & Computing, 2005The study's goal was to determine if cardiac output (CO), obtained by impedance cardiography (ICG), would be improved by a new equation N, implementing a square root transformation for dZ/dtmax/Z0, and a variable magnitude, mass-based volume conductor Vc.
Donald P. Bernstein, H. J. M. Lemmens
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Hospital volume and stroke outcome
Neurology, 2007Although hospital-outcome relationships have been explored for a variety of procedures and interventions, little is known about the association between annual stroke admission volumes and stroke mortality. Our aim was to determine whether facility type and hospital volume was associated with stroke mortality.All hospital admissions for ischemic stroke ...
G, Saposnik +5 more
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The regulation of the ratio of the cardiopulmonary blood volume to stroke volume in sheep
Cardiovascular Research, 1989Volume expansion with dextran was used in unanaesthetised sheep to investigate the mechanisms which are responsible for keeping the ratio of the cardiopulmonary blood volume to stroke volume (CPFI) constant under physiological conditions. For animals with heart rates lower than 80, active pulmonary vasoconstriction was mainly responsible for the ...
J M, van Rooyen, J J, van der Walt
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Muscle Metaboreflex-Induced Increases in Stroke Volume
Medicine & Science in Sports & Exercise, 2003Accumulation of by-products of metabolism within skeletal muscle may stimulate sensory nerves, thus evoking a pressor response named muscle metaboreflex. The aim of this study was to evaluate changes in central hemodynamics occurring during the metaboreflex activation.In seven healthy subjects, the metaboreflex was studied by postexercise regional ...
CRISAFULLI, ANTONIO +8 more
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