[Isosorbide 5-mononitrate (delayed release) in stable effort angina]

This work has been carried out to evaluate over a short and medium space of time (100 days) the efficacy, tolerance and haemodynamic repercussion of 50 mg of sustained release Isosorbide 5-Mononitrate administered once day to patients with stable effort angina in a random and prospective study, which was double blind crossover and placebo-controlled. In this study we included 10 patients who showed positive exercise test using clinical (angina) and electrocardiographic (ischemic drop of the ST greater than 1 mm) criteria. The assessment was done with cycloergometry starting with 30W and increasing by 20W every 2 minutes until angina appeared accompanied by an ischemic drop of the ST. The effort tests were done basally and at intervals of 4, 12 and 24 hours after the dose. The parameters studied were obtained on the 1st, 25th and 100th days of the study and were compared with those of the placebo. The time taken for the ST to 1 mm to fall (seconds) increased when evaluated after 4 and 12 hours on the 1st, 25th and 100th days in comparison with placebo (p < 0.05). The time taken for angina (seconds) to appear lengthened considerably when evaluated 4 and 12 hours after the dose not only on the 1st day but also on the 25th and 100th days in comparison with placebo (p < 0.05). The duration of the effort (seconds) was significantly greater after 4 and 12 hours on the 1st, 25th and 100th days when compared to that of the placebo (p < 0.05).(ABSTRACT TRUNCATED AT 250 WORDS)