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  • Title: Felodipine and amlodipine in stable angina pectoris: results of a randomized double-blind crossover trial.
    Author: Koenig W, Höher M.
    Journal: J Cardiovasc Pharmacol; 1997 Apr; 29(4):520-4. PubMed ID: 9156363.
    Abstract:
    A randomized, double-blind, crossover study tested the antiischemic and antianginal efficacy of felodipine, extended-release 5-10 mg, versus amlodipine, 5-10 mg once daily. Fifty-two patients with documented exercise-induced angina pectoris and myocardial ischemia during 24-h electrocardiographic monitoring were included in the study. Forty-seven patients completed the 8-week treatment period, whereas five patients withdrew from the study. The mean number of ischemic episodes/24 h was reduced from 19.9 at baseline to 2.3 during amlodipine and to 2.4 during felodipine; the total duration of ischemic episodes decreased from 69.8 min/24 h to 15.2 min and 15.5 min during amlodipine and felodipine, respectively (for both variables, p = 0.83 and p = 0.53 between treatments, and for both treatments, p < 0.001 compared with baseline). Eighteen (38%) patients receiving amlodipine and 19 (40%) patients receiving felodipine showed no ST-segment depression during treatment. Maximal ST-depression was reduced from an average of 2.1 mm to 1.1 and 1.2 mm on amlodipine and felodipine, respectively (p = 0.68 between treatments and p < 0.001 compared with baseline). Mean heart rate remained unchanged compared with baseline. Anginal attacks were reduced from 16.4/week at baseline to 4.7/week with amlodipine and to 4.3/week with felodipine (p = 0.26 between treatments, and p < 0.001 vs. baseline). Accordingly, nitrate consumption was reduced from 14.7 capsules per week to 4.0 and 3.8 with amlodipine and felodipine, respectively (p = 0.40 between treatments, and p < 0.001 compared with baseline). Adverse reactions were infrequent and distributed similarly between the two treatments. It is concluded that both drugs effectively reduced ischemic episodes and anginal attacks and were well tolerated in patients with stable angina pectoris. There was no evidence that the two regimens were different in their antiischemic and antianginal properties.
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