A 49-yr-old woman comes to the emergency department because of chest pain. She says she was in her usual state of health until the day before, when she awoke at 6 am with the sudden onset of sharp left-sided chest pain. Pain has been constant and radiates to the center of her chest. It is not worsened by exertion, movement, food, activity, or respiration. She also had shortness of breath and chills but no cough, nausea, or diaphoresis. She took 400 mg of naproxen without relief. The pain has persisted, prompting her to come to the emergency department now. She has never had chest pain before this episode and has no known history of cardiac or pulmonary disease.
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