Electrocardiogram of the month.
D001145:Arrhythmias, Cardiac / Q000175:diagnosis*; D005117:Cardiac Complexes, Premature / Q000175:diagnosis*; D004562:Electrocardiography; D006333:Heart Failure / Q000150:complications; D006801:Humans; D009203:Myocardial Infarction / Q000150:complications