Results 301 to 310 of about 779,727 (355)

Nongeometric Doppler stroke volume determination

The American Journal of Cardiology, 1989
Abstract 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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Estimation of Stroke Volume and Stroke Volume Changes by Electrical Impedance Tomography

Anesthesia & Analgesia, 2018
BACKGROUND: 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, André, Hovnanian, Rogério, Souza, Luciano C P, Azevedo, Marcelo B P, Amato, Eduardo L V, Costa   +5 more
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Exercise stroke volume relative to plasma-volume expansion

Journal of Applied Physiology, 1988
The 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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Stroke volume equation for impedance cardiography

Medical & Biological Engineering & Computing, 2005
The 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.
D P, Bernstein, H J M, Lemmens
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Relationship between stroke volume and pneumocardiogram

Journal of Applied Physiology, 1982
The 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, G H, Stewart, G, Tremblay, P R, Lynch   +3 more
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Muscle Metaboreflex-Induced Increases in Stroke Volume

Medicine & Science in Sports & Exercise, 2003
Accumulation 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 A, SCOTT AC, WENSEL R, DAVOS CH, FRANCIS DP, PAGLIARO, Pasquale, COATS, AJ, CONCU A, PIEPOLI MF   +8 more
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Hospital Stroke Volume and Case-Fatality Revisited

Medical Care, 2010
A few studies have found an inverse association between hospital patient volume and case-fatality among stroke patients. However, the different stroke categorizations used in these studies might have influenced the findings. Furthermore, the relevance of the association observed remains questionable given that the relatively small magnitude may not ...
Ogbu, UC, Slobbe, LCJ, Arah, OA, de Bruin, A, Stronks, K, Westert, GP   +5 more
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Hospital volume and stroke outcome

Neurology, 2007
Although 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, A, Baibergenova, M, O'Donnell, M D, Hill, M K, Kapral, V, Hachinski   +5 more
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Pneumoperitoneum affects stroke volume variation in humans

Journal of Anesthesia, 2014
Stroke volume variation (SVV) is affected by many factors. Although elevated intra-abdominal pressure and a pneumoperitoneum have been shown to increase SVV in animals, a recent human study showed that SVV did not change as a pneumoperitoneum was established.
Zen'ichiro, Wajima, Toshiya, Shiga, Kazuyuki, Imanaga   +2 more
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Stroke Volume Optimization: The New Hemodynamic Algorithm

Critical Care Nurse, 2015
Critical care practices have evolved to rely more on physical assessments for monitoring cardiac output and evaluating fluid volume status because these assessments are less invasive and more convenient to use than is a pulmonary artery catheter. Despite this trend, level of consciousness, central venous pressure, urine output, heart rate, and blood ...
Alexander, Johnson, Thomas, Ahrens
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