Ricki Megidish

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We studied the physiology of pulmonary venous flow in 13 normal subjects and five patients with atrial rhythm disorders and atrioventricular conduction disturbances with pulsed Doppler and two-dimensional echocardiography. The left atrium, mitral valve, and pulmonary venous ostia were visualized through the apical four-chamber view. Mitral and pulmonary(More)
The present study was designed to assess the relative contribution of atrial fibrillation and left atrial pressure to changes in the size of the left and right atria in patients with mitral stenosis. The study included 155 subjects, 102 of whom underwent prospective echocardiography and Doppler cardiography, and 69 of whom underwent cardiac catheterization.(More)
Over a 3 year period we evaluated 23 patients (16 men, seven women) with apical hypertrophic cardiomyopathy by noninvasive and invasive methods. Sixteen patients had chest pain. In 17, results of cardiovascular examination were normal. The electrocardiogram showed precordial inverted T waves in all patients and these were of mild-to-moderate amplitude (less(More)
OBJECTIVES The purpose of this study was to assess individual mechanisms of effort intolerance in patients with heart failure with preserved ejection fraction (HFpEF), heart failure with reduced ejection fraction (HFrEF), or normal cardiac function using combined echocardiography and cardiopulmonary stress testing. BACKGROUND Combined stress(More)
The purpose of the present study was to evaluate the effects of losartan and the combination of losartan and L-arginine on endothelial function and hemodynamic variables in patients with heart failure (HF). Endothelium-dependent vasodilation is impaired in patients with HF. It was hypothesized that the administration of losartan and the combination of(More)
OBJECTIVES This study sought to evaluate mechanisms of effort intolerance in patients with rheumatic mitral stenosis (MS). BACKGROUND Combined stress echocardiography and cardiopulmonary testing allows assessment of cardiac function, hemodynamics, and oxygen extraction (A-Vo2 difference). METHODS Using semirecumbent bicycle exercise, 20 patients with(More)
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