title: Letter: Ventricular premature contractions and A-V conduction. II.
mesh_terms: D001283:Atrioventricular Node / Q000503:physiopathology*; D005117:Cardiac Complexes, Premature / Q000503:physiopathology*; D004562:Electrocardiography; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D012849:Sinoatrial Node / Q000503:physiopathology