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Post-Op IE Antibiotic Duration Negative Cultures — SCE Infectious Diseases MCQ

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HardBone & Joint InfectionPost-Op IE Antibiotic Duration Negative CulturesSCE Infectious Diseases

A 60-year-old man with prosthetic valve endocarditis due to Enterococcus faecalis undergoes valve replacement surgery. Intraoperative cultures from the excised valve are NEGATIVE. He has been on IV antibiotics for 10 days pre-operatively. Should the post-operative antibiotic course be shortened?

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Correct answer: C — If intraoperative valve cultures are negative AND the patient had adequate pre-operative antibiotics with clinical improvement, the post-operative course can be shortened — some guidelines allow completion of the remaining pre-operative course rather than restarting the full 6 weeks

ESC 2023 guidelines offer flexibility: if intraoperative valve cultures are NEGATIVE (suggesting effective pre-operative antibiotic sterilisation), the remaining duration of the pre-operative course can be completed post-operatively. If cultures are POSITIVE, the full course restarts from the date of surgery. This nuanced approach prevents unnecessary prolongation of antibiotics when effective sterilisation has been achieved. Clinical improvement, CRP trajectory, and blood culture clearance all factor into the decision, which should be made by the endocarditis MDT.

Reference: ESC 2023 – Endocarditis; BSAC 2012 – Endocarditis surgical timing