title: Extrasystoles.
authors.forename: C
authors.initials: C
authors.lastname: McRae
authors.forename: N
authors.initials: N
authors.lastname: Carson
mesh_terms: D001146:Arrhythmia, Sinus / Q000175:diagnosis; D001283:Atrioventricular Node; D005117:Cardiac Complexes, Premature / Q000175:diagnosis*; D004562:Electrocardiography; D006801:Humans; D013616:Tachycardia, Sinus / Q000175:diagnosis; D009626:Terminology as Topic