A 67-year-old woman presents to the emergency room with acute chest pain and dyspnea after the death of her husband. She is hypotensive, tachycardic, and diaphoretic. A diagnosis of takotsubo cardiomyopathy is suspected. Which of the following findings best confirms this diagnosis?
A. ST-segment elevation
B. Normal coronary arteries
C. New systolic murmur
D. Elevated serum troponin
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