title: The configuration of epicardial and endocardial extrasystoles in the chest leads.
authors.forename: L H
authors.initials: LH
authors.lastname: NAHUM
authors.forename: H E
authors.initials: HE
authors.lastname: HOFF
mesh_terms: D005117:Cardiac Complexes, Premature; D004562:Electrocardiography; D004699:Endocardium; D006321:Heart; D006801:Humans
keywords: HEART/beat; HEART/electrocardiography