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A randomized double-blind crossover trial was performed in 32 patients with chronic stable angina to compare the antianginal actions of verapamil (120 mg 3 times daily) and nifedipine (20 mg 3 times daily). Efficacy was assessed using objective end points obtained by computer-assisted exercise testing and 24 hour ambulatory monitoring for S-T segment shift. Twenty-eight patients completed the trial. The mean exercise time to produce angina improved from 5.7 +/- 0.3 minutes (mean +/- standard error of the mean) in patients on placebo, to 7.9 +/- 0.5 minutes in those on nifedipine and 10.0 +/- 0.7 minutes in those on verapamil. Similar improvement was seen in all other objective variables. Generally verapamil produced mild bradycardia and nifedipine mild tachycardia. Four patients complained of palpitations and angina after ingestion of nifedipine and were identified by ambulatory monitoring to have tachycardia and persistent S-T depression. These opposite effects on heart rate may explain the differences in efficacy between these 2 potent calcium ion antagonists.
V B Subramanian, and
M J Bowles, and
N S Khurmi, and
A B Davies, and
E B Raftery
December 1988,
Journal of the American College of Cardiology,
V B Subramanian, and
M J Bowles, and
N S Khurmi, and
A B Davies, and
E B Raftery
May 1983,
The American journal of cardiology,
V B Subramanian, and
M J Bowles, and
N S Khurmi, and
A B Davies, and
E B Raftery
February 1986,
Chest,
V B Subramanian, and
M J Bowles, and
N S Khurmi, and
A B Davies, and
E B Raftery
November 1981,
British heart journal,
V B Subramanian, and
M J Bowles, and
N S Khurmi, and
A B Davies, and
E B Raftery
April 1988,
Annales de cardiologie et d'angeiologie,
V B Subramanian, and
M J Bowles, and
N S Khurmi, and
A B Davies, and
E B Raftery
April 1988,
Cardiologia (Rome, Italy),
V B Subramanian, and
M J Bowles, and
N S Khurmi, and
A B Davies, and
E B Raftery
March 1983,
The American journal of cardiology,
V B Subramanian, and
M J Bowles, and
N S Khurmi, and
A B Davies, and
E B Raftery
May 1985,
The American journal of cardiology,
V B Subramanian, and
M J Bowles, and
N S Khurmi, and
A B Davies, and
E B Raftery
June 1990,
The American journal of cardiology,
V B Subramanian, and
M J Bowles, and
N S Khurmi, and
A B Davies, and
E B Raftery
September 1981,
The American journal of medicine,
