The electrocardiogram. The low voltage syndrome.
D004562:Electrocardiography; D005260:Female; D006338:Heart Neoplasms / Q000175:diagnosis* / Q000556:secondary; D006801:Humans; D008545:Melanoma / Q000175:diagnosis / Q000556:secondary; D008875:Middle Aged; D010490:Pericardial Effusion / Q000175:diagnosis*; D013577:Syndrome