# ECG_Challenge#Medscape

A 58-year-old woman has a prolonged episode of chest discomfort that resolves by the time she is seen in the emergency department. She is admitted to the hospital. Several hours after admission, her chest pain recurs and is associated with diaphoresis and shortness of breath. A 12-lead ECG is obtained. What does the ECG show?

A 76-year-old woman with known ischemic cardiomyopathy, a left ventricular ejection fraction of 25%, and a previously inserted pacemaker presents to her cardiologist concerned that there is a problem with the pacemaker because her heart rate is persistently rapid. What does the ECG show?

A 55-year-old woman goes to her primary care doctor because of palpitations, diaphoresis, continued sweating, and feeling nervous. Her physical examination is normal except for elevated heart rate (about 100 beats/min) and blood pressure (150/90 mm Hg). Lab tests show an increased thyroxine level, suggesting an overactive thyroid. She returns for a follow-up visit for palpitations, and a 12-lead ECG is obtained. What does the ECG show?

A 16-year-old boy with no history of heart disease is referred to a cardiologist after his older brother dies suddenly. A routine 12-lead ECG is obtained. What does the ECG show?

A 56-year-old woman who underwent recent coronary artery bypass graft (CABG) surgery for three-vessel coronary artery disease (CAD) presents for routine post-operation follow-up with complaints of fatigue, chest discomfort (unrelated to the sternal incision and seemingly not anginal), shortness of breath, and peripheral edema. A 12-lead ECG is obtained, and the findings are consistent with the physical examination and echocardiogram. What does the ECG show?

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