[A comparison of the results of endocardial and transesophageal electrostimulation of the heart in assessing sinus node function and atrioventricular conduction].

Forty five patients with cardiac arrhythmias were included in this study (20 had paroxysmal atrial fibrillation, 19, supraventricular tachycardias; 11 had sick sinus syndrome). In all patients endocardial electrophysiological study and transesophageal atrial pacing were performed in order to study sinus node function and atrioventricular conduction. The results of two methods of investigation have a high correlation. Quantitative criteria were developed for defining normal parameters of sinus node function and atrioventricular conduction during transesophageal atrial pacing.