title: Detachment of pacemaker active fixation helix.
abstract: The introduction of active fixation electrodes has been a major advance in permanent atrial and ventricular endocardial pacing. We report here an important complication in the use of one such device, the Medtronic transvenous unipolar screw-in ventricular lead (Model 6959).
mesh_terms: D000368:Aged; D004567:Electrodes, Implanted; D006327:Heart Block / Q000628:therapy; D006801:Humans; D008297:Male; D010138:Pacemaker, Artificial / Q000009:adverse effects*