[Probability of electrode dislocation: the importance of threshold measurements during pacemaker implantation (author's transl)].

Myocardial stimulation thresholds were measured during 774 pacemaker implantations with endocardial electrodes. It was found that myocardial thresholds were higher when using electrodes with greater surface area and bipolar ones. Early electrode dislocations were more frequent at higher myocardial thresholds. There was no relationship between frequency of late electrode dislocations and the value of myocardial thresholds. The importance of measurement of myocardial stimulation threshold - as a guarantee of successful pacemaker therapy - is emphasized.