Electrocardiograms of the month.
D009202:Cardiomyopathies / Q000175:diagnosis; D004562:Electrocardiography; D006327:Heart Block / Q000150:complications; D006801:Humans; D006996:Hypocalcemia / Q000175:diagnosis; D010138:Pacemaker, Artificial; D013575:Syncope / Q000209:etiology