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We studied hemodynamics characteristics at the heart level for a lot of 15 obese patients. We investigated echocardiographic and multigated radionuclide parameters correlating with the body mass index (BMI) or left ventricular ejection fraction (LVEF). Furthermore, the linear relationship obtained by plotting end-systolic volume (ESV) against end-diastolic volume (EDV) can be more useful than the...
One of the major questions in cardiovascular physiopathology is to distinguish between a change in ventricular performance or vascular system and to provide quantitative evaluation of both cardiac and vascular functions. For a nonlinear lumped parameter model of the cardiovascular system, the hemodynamic and left ventricular volume variations were investigated for changes in characteristic parameters...
The present study examines the effects of obesity on left ventricular (LV) biomechanics in obese women. Thirty-two women were evaluated: 12 were non-obese (body mass index BMI < 30 kg/m2) and 20 were obese (BMI > 30 kg/m2); ten of which were hypertensive and ten were non-hypertensive. Left ventricular dimensions and systolic and diastolic functions were assessed by 2D echocardiography and tissue...
The effect of chopper frequency and relative pulsetime on the rotor's rectified current ripple and the motor's developed torque were investigated. The electrical drive (three phase uncontrolled bridge rectifier and a chopper controlled external resistance) provides contactless adjustment of rotor resistance by high switching ability of power semiconductor devices. Using a high switch power semiconductor...
Obesity is a major health problem worldwide, with important economic and social effects. Obesity affects cardiovascular and respiratory systems directly. In this paper, after presenting a noninvasive indicator of contractility, based on the clinical echocardiografic measurements, a computer model (implemented in Simulink) based on the simplified circuit of the cardiovascular model is used, taking...
Obesity is associated with haemodynamic overload. In addition to the increased preload, left ventricular (LV) afterload is also elevated in obese individuals; an increased LV mass can alter LV filling indexes. End-systolic pressure-volume relation (ESPVR) is relatively load independent and sensitive to changes in LV contractility. In this paper, end-systole ventricular contractility Ees was determined...
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