Abstract
Intracardiac potentials were measured and followed up by telemetric pacemaker systems after pacemaker implantation. Intracardiac amplitudes of P and R waves were maintained postaperatively. Intracardiac myopotentials were also measured and tachycardia due to oversensing of myopotentials was studied on the intracardiac electrocardiogram. The influence of electromagnetic interference was also examined by means of transcutaneous electrical nerve stimulator. Measurements of postoperative intracardiac amplitudes are of clinical use.