Alprenolol alone and in conjunction with pentanitrol in angina pectoris. A double-blind study with exercise tests.

Total work performance has been determined in 13 patients with angina pectoris during treatment with alprenolol alone and in conjunction with pentanitrol in a double-blind study. Nine patients had a significant increase in work performance on alprenolol, but there was no difference between the two preparations. By measuring triple product and QS2 index before and after a test dose of alprenolol, it may be possible beforehand to select responders to this treatment.