title: EKG of the month. Sinus rhythm and premature ventricular beats.
mesh_terms: D003327:Coronary Disease / Q000175:diagnosis; D004562:Electrocardiography; D006339:Heart Rate; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000188:drug therapy; D011342:Procainamide / Q000627:therapeutic use; D011802:Quinidine / Q000627:therapeutic use
chemical_list: D011802:Quinidine; D011342:Procainamide