Publications by authors named "S Witchitz"

The purpose of this study was 1. to define relationships between myocardial velocities according to phases and the range of dynamic phasic changes in controls using tissue Doppler echocardiography (TDE); 2. to compare the usefulness of dynamic changes vs.

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Aims: It was two-fold (1) to define tissue Doppler echocardiographic characteristics of the end-systolic septal anterior motion: passive due to heart translation, or active motion free of translational effects, substantiated by a myocardial velocity gradient. (2) to specify the temporal features of this septal anterior motion on normal and hypertrophied left ventricles since it occurs while the posterior wall contracts during late ejection.

Methods And Results: Myocardial velocity gradient was calculated during the anterior motion in simultaneously colour M-mode imaged septal and posterior walls of 21 controls (49+/-12 years) and 17 patients (49+/-13 years) with left ventricle hypertrophy.

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The aim was to assess the capabilities of a two-segment myocardial recording to recognize patients with an underlying chronic ischemic process as a fast screening from controls, prior to the usual segment-to-segment tissue Doppler echocardiographic assessment of ischemia. Ischemia generates systolic and relaxation abnormalities. A flow Doppler index of global systolic and diastolic myocardial performance was recently drawn from time durations studied by coupling isovolumic relaxation (IR) to preejection (PEP)/ejection (ET) ratio (PEP/ET).

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Treatment with beta blockers results in improvement in functional status, and reduces mortality in patients with heart failure. A number of differences in the results noted could be due to additional properties of the specific beta blockers studied: absence of cardioselectivity, and existence of a vasodilator effect and of an associated antioxidant effect. We studied the effects of celiprolol, a cardioselective beta blocker with a stimulant effect on beta2 receptors.

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