[The diagnosis of the dislocation and microdislocation of an endocardiac electrode based on x-ray and electrocardiographic study data].

The X-ray films and ECG records were analysed in 11 cases of dislocation and 20 cases microdislocation of the endocardial lead in patients with monopolar ventricular pacing. In 3 patients lead was dislocated into the right ventricle cavity, in 2 patients--in the another heart cavity, in 6 cases lead dislocation was negligible. In 20 cases of microdislocation the fluctuation all intracardiac parts of the endocardial lead not only his distal end was revealed. Therefore it is better to call this complication of heart pacing "the endocardial lead instability". The X-ray picture of the negligible lead dislocation was identical to microdislocation: a thickening unclear contour of the distal lead end. The ECG picture in cases of dislocation was different from microdislocation: the lack of pacing contrary to pacing preserved in cases of microdislocation. All patients with dislocation and microdislocation had high amplitude spike of pacemaker impulses.