Case presentation In May 2005 ,a 52-year-old woman was admittedto our emergency room with chest discomfort . Thesymptomhad started about 1 hour before admission.She denied any history of hypertension or diabetesmellitus . Adetailed medical history did not reveal anyprevious cardiac symptoms or risk factors for coronaryartery disease.Electrocardiography(ECG) was normalabout 4 months prior tothe current admission(Fig1) .Physical examination did not reveal any abnormalfinding. There was nojug…