Abnormal electrocardiogram in the absence of heart disease.
D001145:Arrhythmias, Cardiac / Q000175:diagnosis; D003951:Diagnostic Errors; D004562:Electrocardiography; D006327:Heart Block / Q000175:diagnosis*; D006801:Humans; D009203:Myocardial Infarction / Q000175:diagnosis; D012420:Running; D013178:Sports Medicine