title: Significance of site of origin of premature ventricular contractions.
mesh_terms: D000328:Adult; D000368:Aged; D005117:Cardiac Complexes, Premature / Q000175:diagnosis / Q000209:etiology*; D004562:Electrocardiography; D005069:Evaluation Studies as Topic; D005260:Female; D006329:Heart Conduction System / Q000503:physiopathology*; D006331:Heart Diseases / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged