The transoesophageal electrostimulation of the heart offers as a non-invasive method in the preliminary diagnostics of disturbances of the cardiac rhythm, in which cases it shall not substitute the intracardiac electrography, but supplement its diagnostic possibilities. Particularly by the demonstration of the disturbed sinus node function or by initiation of tachycardias by means of transoesophageal stimulation methods the little extensive non-invasive examination method may lead to directing findings in patients with unclear arrhythmias and/or unclarified syncopes.