Jackie Johnson, a 35-year-old African-American, married female, advertising executive, presents to the emergency department with complaints of chest pain. The pain is described as 8 on a scale ranging from 1 to 10

Jackie Johnson, a 35-year-old African-American, married female, advertising executive, presents to the emergency department with complaints of chest pain. The pain is described as 8 on a scale ranging from 1 to 10, retrosternal, and sharp in nature. It radiates to the back, is worse with taking a deep breath, and is improved by leaning forward. On review of systems, she has noted a “flulike illness” over the last several days, including fever, rhinorrhea, and cough. She has no medical history and is taking no medications. She denies tobacco, alcohol, or drug use. On physical examination, she appears in moderate distress from pain, with a blood pressure of 125/85 mm Hg, heart rate 105 bpm, respiratory rate 18/min, and oxygen saturation of 98% on room air. She is currently afebrile. Her head and neck examination is notable for clear mucus in the nasal passages and a mildly erythematous oropharynx. The neck is supple, with shotty anterior cervical lymphadenopathy. The chest is clear to auscultation. Jugular veins are not distended. Cardiac examination is tachycardic with a three-component high-pitched squeaking sound. Abdominal and extremity examinations are normal. (Adapted from Hammer & McPhee, p. 325 case 61.)