Abstract
Seventy-two hypertensive patients were treated with pindolol, a beta adrenergic blocking drug with intrinsic sympathomimetic activity. Serial measurements of systolic time intervals were utilized (1) to determine whether the therapeutic response to pindolol was predictable from pretreatment measurements, and (2) to assess changes in cardiac function during a 15 week treatment period. Patients with an abnormal pretreatment ratio of preejection period to left ventricular ejection time (PEP/LVET) of greater than 0.42 were less likely to respond with a decrease in mean blood pressure of greater than 10 percent (8 of 22) than were patients with a normal (0.42 or less) pretreatment PEP/LVET ratio (33 of 50) (p
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