title: Propranolol-verapamil versus propranolol-nifedipine in severe angina pectoris of effort: a randomized, double-blind, crossover study.
abstract: To compare a propranolol-verapamil with a propranolol-nifedipine combination in patients with severe angina of effort, 16 patients (11 men and 5 women, aged 56 +/- 8 years [mean +/- standard deviation]) with more than 5 episodes/week of angina and a positive exercise tolerance test despite propranolol (229 +/- 44 mg/day [range 180 to 360]) were maintained on this dose of propranolol and, in addition, received verapamil (360 mg/day) and nifedipine (60 mg/day) for 3 weeks each in a double-blind, randomized fashion. In comparison with propranolol alone, anginal frequency and nitroglycerin usage were reduced by propranolol-verapamil but not by propranolol-nifedipine. Exercise time (standard Bruce protocol) was similar for the 2 combinations (6.4 +/- 2.0 minutes with propranolol-verapamil, 6.6 +/- 2.1 minutes with propranolol-nifedipine, difference not significant), but the magnitude of ST-segment depression at peak exercise was less (p less than 0.05) during propranolol-verapamil (0.03 +/- 0.06 mV) than during propranolol alone (0.18 +/- 0.07 mV) and propranolol-nifedipine (0.08 +/- 0.07 mV). Left ventricular ejection fraction at rest was higher (p less than 0.05) with propranolol-nifedipine (0.62 +/- 0.10) than with propranolol-verapamil (0.58 +/- 0.10), but neither differed from ejection fraction at rest with propranolol alone (0.59 +/- 0.08). Ejection fraction at peak exercise was similar during all 3 periods. In 2 patients, verapamil caused weakness, lightheadedness, and severe sinus bradycardia (40 to 48 beats/min), and the dosage was reduced (blindly) to 240 mg/day, with the alleviation of bradycardia and associated symptoms.(ABSTRACT TRUNCATED AT 250 WORDS)
mesh_terms: D000787:Angina Pectoris / Q000000981:diagnostic imaging / Q000188:drug therapy* / Q000503:physiopathology; D004311:Double-Blind Method; D004359:Drug Therapy, Combination; D004361:Drug Tolerance; D004562:Electrocardiography; D005080:Exercise Test; D005260:Female; D006801:Humans; D008124:Locomotion; D008297:Male; D008875:Middle Aged; D009543:Nifedipine / Q000627:therapeutic use*; D010349:Patient Compliance; D011433:Propranolol / Q000627:therapeutic use*; D011877:Radionuclide Imaging; D011897:Random Allocation; D013318:Stroke Volume / Q000187:drug effects; D014700:Verapamil / Q000627:therapeutic use*
chemical_list: D011433:Propranolol; D014700:Verapamil; D009543:Nifedipine