Necrotising Pneumonia Antibiotic Choice — FRCA Final MCQ

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HardIntensive Care MedicineNecrotising Pneumonia Antibiotic ChoiceFRCA Final

A 70-year-old man in ICU with severe community-acquired pneumonia has persistent fever despite 5 days of appropriate antibiotics. CT chest shows necrotising pneumonia with multiple cavities. Cultures grow Staphylococcus aureus (MSSA). Which antibiotic provides the best lung tissue penetration for staphylococcal necrotising pneumonia?

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Correct answer: B — Linezolid IV

For staphylococcal necrotising pneumonia with cavitation, linezolid provides excellent lung tissue penetration (epithelial lining fluid concentrations far exceed plasma levels) and inhibits toxin production (PVL – Panton-Valentine Leucocidin). Flucloxacillin is first-line for MSSA bacteraemia but has moderate lung penetration. Vancomycin has poor lung penetration. Daptomycin is INACTIVATED by pulmonary surfactant and must NEVER be used for pneumonia. Linezolid + clindamycin (toxin suppression) is the combination recommended for PVL-positive staphylococcal pneumonia.

Reference: PHE – 2017 – PVL-SA guidance; NICE – 2023 – NG138 Pneumonia; ICS – 2023 – ICU antimicrobials