title: Alternate patterns of premature ventricular excitation during spontaneous atrial bigeminy.
mesh_terms: D000368:Aged; D002037:Bundle-Branch Block / Q000209:etiology; D005117:Cardiac Complexes, Premature / Q000188:drug therapy / Q000503:physiopathology*; D004562:Electrocardiography; D005260:Female; D006325:Heart Atria / Q000503:physiopathology; D006329:Heart Conduction System / Q000503:physiopathology*; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D011802:Quinidine / Q000627:therapeutic use
chemical_list: D011802:Quinidine