Effects of nicorandil on exercise tolerance in patients with stable effort angina: a double-blind study.

Effects of nicorandil, a recently introduced 2-nicotinamidethyl nitrate, on exercise performance were studied in 11 patients with stable effort angina. The duration of exercise before the onset of angina and time to the onset of ischemic ST depression 30 minutes after 20 mg of oral nicorandil were compared with events 30 minutes after oral placebo and 5 minutes after 0.3 mg of sublingual nitroglycerin. Nicorandil and placebo were given according to the randomized double-blind method. Nicorandil prolonged the duration of exercise in all 11 patients by 2.3 +/- 2.2 minutes (mean +/- SD, p less than 0.01) and delayed the onset of ischemic ST depression by 2.3 +/- 1.7 minutes compared to placebo (p less than 0.01). The increment of the duration of exercise and the time to the onset of ischemic ST depression following 20 mg of oral nicorandil were almost equivalent to findings after sublingual nitroglycerin (by 2.0 +/- 1.8 and 2.5 +/- 1.7 minutes, respectively). Nicorandil also increased the pressure-rate product at the time of angina compared with placebo (20,420 +/- 480 vs 17,480 +/- 370, p less than 0.05). These results indicate that oral administration of nicorandil should be considered for the clinical treatment of effort angina.