EUNACOM Sección Teórica Practice Questions - Chile EUNACOM Sección Teórica - Examen Único Nacional De Conocimientos De Medicina Exam

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A 45-year-old male with a history of bicuspid aortic valve presents with low-grade fever, malaise, night sweats, and weight loss over 4 weeks. Physical examination reveals a new 3/6 regurgitant diastolic murmur at the left sternal border and subungual splinter hemorrhages. Transthoracic echocardiography shows a 9 mm mobile vegetation on the aortic valve. What is the most appropriate initial diagnostic microbiological strategy before starting empiric antimicrobial therapy?

Draw at least 3 separate sets of blood cultures from different venipuncture sites separated by at least 30–60 minutes prior to administering antibiotics Draw a single aerobic blood culture tube and immediately start high-dose broad-spectrum oral amoxicillin Perform an immediate diagnostic pericardiocentesis to culture pericardial fluid Initiate IV ceftriaxone immediately and obtain blood cultures 24 hours later once fever subsides

Correct Answer:

Draw at least 3 separate sets of blood cultures from different venipuncture sites separated by at least 30–60 minutes prior to administering antibiotics

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