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PET Upgrading Duke Criteria — EECC MCQ

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HardValvular Heart DiseasePET Upgrading Duke CriteriaEECC

A 55-year-old man with a St Jude mechanical mitral valve presents with fever and positive blood cultures (Enterococcus faecalis). TOE shows no vegetations. FDG-PET/CT shows intense periprosthetic FDG uptake. He fulfils modified Duke criteria for 'possible' IE. What is the impact of the PET findings?

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Correct answer: B — Adding PET findings to the modified Duke criteria upgrades the diagnosis from 'possible' to 'definite' IE — abnormal FDG activity around a prosthetic valve (implanted >3 months) is a major imaging criterion

The 2023 ESC IE Guidelines modified the Duke criteria to include advanced imaging. For prosthetic valve IE: abnormal periprosthetic activity on FDG-PET/CT (when the valve was implanted >3 months ago to avoid post-surgical false positives) is classified as a major criterion, equivalent to echocardiographic vegetations. This is transformative because TOE sensitivity for prosthetic valve IE is limited (~60-70%), and PET/CT can detect perivalvular infection (abscess, pseudoaneurysm) and embolic complications. In this patient, the combination of 2 major criteria (blood culture + PET) and clinical features would upgrade the classification to definite IE, mandating treatment with prolonged IV antibiotics and Heart Team discussion regarding surgical intervention.

Reference: ESC (2023): Guidelines on Infective Endocarditis