Acute and chronic effects of once-daily isosorbide-5-mononitrate on the exercise capacity of patients with angina pectoris treated with a beta-blocking drug.
Forty-four patients with stable effort angina pectoris were included in a double-blind, randomised, placebo-controlled, parallel group study to compare the effect of two slow-release forms of isosorbide-5-mononitrate ('Ismo-Retard' 40 mg and 'Imdur' 60 mg) on exercise capacity when given as an adjunctive treatment to beta adrenoreceptor blocking therapy. In a symptom-limited exercise test performed three hours after the first dose, Ismo-retard increased the total duration of exercise by 92 seconds (confidence interval (CI) 5.1-116.9) p less than 0.006, and the time of onset to anginal pain by 117 seconds (CI 27.8, 156.1) p less than 0.004. A similar improvement in total duration of exercise (by 87 seconds) was noted three hours following 15 consecutive once-daily doses (CI 16.8-128) p less than 0.02, and in the time of onset to anginal pain by 101 seconds (CI 19.8-139.6) p less than 0.01. For Imdur the corresponding results were 53 seconds (CI 12.7-56.3), 84 seconds (CI 15.4-103.7), p less than .02, 54 seconds (CI 1.4-78.4) and 85 seconds (CI 6.9-120.5) respectively. These results would suggest that both active treatments were effective anti-anginal agents.
Royal Infirmary, Glasgow.
H
H
Eteiba
I
I
Hutton
R A
RA
Foale
F
F
Akhras
G
G
Jackson
R J
RJ
Prescott
R J
RJ
Hallam
K J
KJ
Quinn
D000319:Adrenergic beta-Antagonists / Q000627:therapeutic use*; D000368:Aged; D000787:Angina Pectoris / Q000188:drug therapy*; D003692:Delayed-Action Preparations; D004311:Double-Blind Method; D004359:Drug Therapy, Combination; D005260:Female; D006801:Humans; D007548:Isosorbide Dinitrate / Q000031:analogs & derivatives* / Q000097:blood / Q000627:therapeutic use; D008297:Male; D008875:Middle Aged; D010807:Physical Endurance / Q000187:drug effects*
D000319:Adrenergic beta-Antagonists; D003692:Delayed-Action Preparations; D007548:Isosorbide Dinitrate; C030397:isosorbide-5-mononitrate