title: [Morphology of the QRS complex in patients with endocavitary pacing].
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002037:Bundle-Branch Block / Q000175:diagnosis; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000175:diagnosis; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial / Q000295:instrumentation*
vernacular_title: Morfologia zespołu QRS u chorych stymulowanych endokawitarnie