## Investigation of Choice for Infective Endocarditis Confirmation **Key Point:** Transesophageal echocardiography (TEE) is the gold standard and most specific imaging modality for diagnosing infective endocarditis, particularly for detecting vegetations, paravalvular abscesses, and prosthetic valve involvement. ### Why TEE is Superior | Feature | TTE | TEE | |---------|-----|-----| | Sensitivity for vegetations | 60–70% | 90–95% | | Detection of paravalvular abscess | 40% | 85–90% | | Prosthetic valve assessment | Poor | Excellent | | Acoustic window dependency | High | Low (esophageal proximity) | | Invasiveness | Non-invasive | Semi-invasive (endoscopy) | **High-Yield:** TEE is indicated when: - TTE is non-diagnostic but clinical suspicion remains high - Prosthetic valve endocarditis is suspected - Complications (abscess, fistula, perforation) are suspected - Patient has poor acoustic windows (obesity, COPD) ### Modified Duke Criteria Context Echocardiography findings are a major criterion in the Modified Duke Criteria for IE diagnosis: - **Major criterion:** Oscillating intracardiac mass on valve or supporting structures, paravalvular abscess, or new partial dehiscence of prosthetic valve - TEE provides superior detection of these findings compared to TTE **Clinical Pearl:** In this patient with rheumatic heart disease and clinical signs of IE (fever, new murmur, splinter hemorrhages), TEE would definitively demonstrate vegetations on the mitral valve and assess for complications like chordal rupture or abscess formation. **Tip:** Blood cultures remain the gold standard for organism identification and antibiotic susceptibility, but echocardiography is the imaging gold standard for structural diagnosis. [cite:Harrison 21e Ch 124]
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