[Diagnosis and therapy of bradycardial arrhythmias (round table conference)]

In recent years a growing number of pacemakers have been implanted in Switzerland. An indication for this treatment, in addition to AV block with or without syncope, is now sick sinus syndrome. Intracardiac ECG recording is demonstrated, in view of the fact that this technic has made it possible to differentiate blocks in the bundle of His and in the fascicles. The pacemaker systems most used in Switzerland are described, with comparison of the new lithium cells and mercury batteries. The importance of follow-up in these patients is stressed. Finally, reference is made to the ECG alterations in pacemaker carriers which may cause difficulties of interpretation.