[The intracardial ECG during permanent pacemaker-implantation (author's transl)].

As our researches and prevailing procedures have proved a permanent pervenous pacer implantation necessitates an additional intra-cardial ECG in parallel with the practised approach under fluoroscopy and by measuring the threshold current. The patho-physiological prerequisites are explained in detail. By means of the characteristic shape of the ST-elevation and the determination of the amplitude in mV, deciding factors for an advantageous position of the electrode may be gained. In order to ensure safe function of the demand mechanism monitoring by an intra-cardial ECG to establish a sufficient signal amplitude in mV is indispensable. This is particularly applicable in case of leads with a small surface area resulting in a low threshold current value and a low amplitude of QRS-signals.