Acute myocardial infarction in a 39-year-old lactating woman

A 39-year-old Chinese woman presented to the department of emergency with chest pain radiating to the left shoulder and arm accompanied with sweating and nausea for 4 h. Her blood pressure was 120/70 mmHg symmetrically over both arms and her pulse was 70 beats per minute. Her physical examination was normal. Electrocardiography showed sinus rhythm with ST-segment elevation in leads II and aVF. Laboratory data revealed cardiac troponin I of 3.0 ng/ml (relative index < 0.02 ng/ml), creatine kinase MB of 106.0 ng/ml (relative index < 7.0 ng/ml), and myoglobin of 117.0 ng/ml (relative index < 112.0 ng/ml).