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To evaluate the effect of acute beta-blockade in combination with differing heart rates on longitudinal and circumferential regional myocardial function using Doppler myocardial imaging and two-dimensional-echocardiography.

european journal of echocardiography

The Effect of Pacing-induced Heart Rate Variation on Longitudinal and Circumferential Regional Myocardial Function After Acute Beta-Blockade—a Cardiac Ultrasound Study