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- W2000583605 abstract "Verapamil, a calcium antagonist, has been used extensively for treatment of cardiac arrhythmias. Concern persists, however, that it may seriously depress myocardial function in cardiac patients. To investigate this possibility, 20 patients with coronary artery disease (CAD) but no heart failure were given intravenous verapamil (0.1 mg/kg bolus, followed by 0.005 mg/kg/min infusion), and studied hemodynamically and angiographically. Verapamil markedly lowered mean aortic pressure (94 +/- 17 to 82 +/- 13 mm Hg, p less than 0.0005) and systemic vascular resistance (1413 +/- 429 to 1069 +/- 235 dyn-sec-cm5, p less than 0.0005). Simultaneously, all indices of left ventricular (LV) performance greatly improved: cardiac index rose from 2.8 +/- 0.6 to 3.1 +/- 0.7 1/min/m2 (p less than 0.0005), mean velocity of circumferential fiber shortening increased from 0.85 +/- 0.39 to 0.97 +/- 0.46 circ/sec (p less than 0.01), and ejection fraction improved from 55 +/- 16 to 61 +/- 18% (p less than 0.01). No significant changes were noted in the heart rate before and after verapamil administration, and verapamil did not worsen the extent of LV asynergy in the majority of patients. In patients with CAD, the intrinsic negative inotropic effect of verapamil is of negligible importance because its potent vasodilatory properties more than compensate for any intrinsic decrease in LV contractility, and thereby improve the overall cardiac function." @default.
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- W2000583605 date "1979-02-01" @default.
- W2000583605 modified "2023-09-27" @default.
- W2000583605 title "Effects of verapamil on myocardial performance in coronary disease." @default.
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- W2000583605 doi "https://doi.org/10.1161/01.cir.59.2.313" @default.
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