title: Intracavitary electrocardiography as a guide to pacemaker postitioning.
mesh_terms: D000328:Adult; D006328:Cardiac Catheterization; D004562:Electrocardiography / Q000295:instrumentation; D004566:Electrodes; D006327:Heart Block / Q000628:therapy; D006801:Humans; D008722:Methods; D010138:Pacemaker, Artificial