[Programmed endocardiac stimulation of the right ventricle in patients with various forms of ventricular disorders of the heart rhythm: the results and their significance].

An intracardiac electrophysiologic study of 73 patients, including those without ventricular arrhythmias, those with chronic ventricular ectopic activity of varying levels, and those with paroxysmal or nonparoxysmal ventricular tachycardia, has identified specific electrophysiologic phenomena that may be used as criteria for the diagnosis of paroxysmal ventricular tachycardias and assessment of the effect of anti-arrhythmic drugs at electrophysiologic testing.