title: A suggested mechanism for Mobitz type II block based on concealed atrial reciprocation.
mesh_terms: D000328:Adult; D001146:Arrhythmia, Sinus / Q000139:chemically induced; D006332:Cardiomegaly / Q000209:etiology; D004562:Electrocardiography; D006327:Heart Block / Q000209:etiology*; D006801:Humans; D007275:Injections, Intravenous; D007545:Isoproterenol; D008297:Male; D011666:Pulmonary Valve Stenosis / Q000151:congenital*; D013771:Tetralogy of Fallot / Q000150:complications*
chemical_list: D007545:Isoproterenol