Early and Very Early Post-Transcatheter Aortic Valve Implantation Infective Endocarditis: Imaging Challenges

Area of Science:

• Cardiology
• Infectious Diseases
• Radiology

Background:

• Transcatheter aortic valve implantation (TAVI) is a procedure for severe aortic stenosis.
• Patients undergoing TAVI face a high risk of infective endocarditis (IE), particularly in the first year.
• Early IE diagnosis is crucial for effective treatment and improved patient outcomes.

Purpose of the Study:

• To review the diagnostic challenges of very early and early infective endocarditis (0-60 days) following TAVI.
• To highlight the limitations of current imaging modalities for IE detection post-TAVI.
• To emphasize the need for a multimodal imaging strategy.

Main Methods:

• Review of current imaging techniques for IE detection post-TAVI, including echocardiography, nuclear imaging (18F-FDG PET/CT, WBC SPECT/CT), and intracardiac echocardiography (ICE).
• Discussion of the sensitivity, specificity, and limitations of each modality.
• Emphasis on the challenges posed by post-operative inflammation and the critical 0-60 day period.

Main Results:

• Current imaging techniques have limitations in sensitivity and specificity for early IE detection post-TAVI.
• Nuclear imaging shows promise but can yield false positives due to inflammation.
• ICE offers detailed visualization but is invasive; whole-body imaging aids in detecting systemic complications.

Conclusions:

• Diagnosing IE within 60 days post-TAVI is complex due to inconclusive imaging findings.
• A multimodal imaging approach is recommended to overcome individual modality limitations.
• Clinical vigilance and consideration of early antimicrobial therapy are vital, even with uncertain imaging results.