[Evaluation of the anti-arrhythmic effect of intracardiac laser therapy by 24-hour electrocardiographic monitoring of patients with acute myocardial infarction].

Ventricular arrhythmias were studied by Holter's 24-hour ECG monitoring in 215 acute myocardial infarction patients within the first day of the disease. Twenty-five minutes sessions of blood irradiation by a 2-4 mW helium-neon laser (HNL) through a light guide, introduced into the right atrium via the subclavian vein, were conducted for 3-5 days in 180 patients. The HNL therapy showed a marked antiarrhythimic effect in acute myocardial infarction, significant for the prevention and treatment of ventricular arrhythmias. High antiarrhythmic activity was noted in patients with frequent ventricular extrasystoles and high-grade arrhythmias. Control patients showed no significant spontaneous reduction of the rate of ventricular arrhythmias over a comparable period of time.