title: Parasystolic ventricular tachycardia. Observations on differential stimulus threshold as possible mechanism for exit block.
mesh_terms: D000328:Adult; D002037:Bundle-Branch Block / Q000175:diagnosis; D004562:Electrocardiography; D006327:Heart Block / Q000175:diagnosis / Q000209:etiology*; D006329:Heart Conduction System / Q000503:physiopathology; D006352:Heart Ventricles; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D005082:Physical Exertion; D013610:Tachycardia / Q000175:diagnosis / Q000209:etiology* / Q000503:physiopathology; D014672:Vectorcardiography