Effect of isosorbide dinitrate (sorbonit) on the exercise reaction in patients with coronary disease and in healthy individuals

: The study aimed at evaluating an effect of a single dose of isosorbide dinitrate (Sorbonit) on the exercise reaction in the patients with coronary disease of various degree and in healthy individuals. The study involved 20 male patients of mean age 54.0 +/- 4.5 years with history of myocardial infarction and 12 healthy males of mean age 45.6 +/- 5.0 years. Ergometric test has been performed twice: prior to and 15 minutes after sublingual administration of isosorbide dinitrate in the dose of 10-15 mg. The first test has been interrupted when horizontal ST load exceeded 1 mm or contractions rate was 60% of the maximum value. Similar loads have been used after the administration of Sorbonit. The following parameters have been evaluated: heart rate (HR), systolic blood pressure (BPS), HR x BPS, lactate level (LA), and cardiac index. The value of the load has been measured with the aid of oxygen consumption (VO2). Significant depression of ST segment (less than 3 mm) in the exercise ECG has been noted in 8 patients following isosorbide dinitrate. Exercise tolerance has increased in these patients - CI increased during exercise following drug administration (VO2 the same as prior to the drug administration), and VO2/CI has became closer - physiological.