Echocardiography for Enterobacter cloacae Bacteremia

Risk Stratification Approach

• The European Society of Cardiology recommends ordering an echocardiogram (TTE initially) for E. cloacae bacteremia if the patient has any high-risk features for infective endocarditis, including prosthetic valves, intracardiac devices, persistent fever despite appropriate antibiotics, new cardiac murmur, embolic events, heart failure signs, or immunocompromised status 1, 2, 3
• E. cloacae bacteremia requires individualized assessment based on specific clinical features since it is not explicitly addressed in major endocarditis guidelines, unlike S. aureus bacteremia where echocardiography has a Class IIa recommendation regardless of risk factors 1, 2, 4

Mandatory Echocardiography

• Patients with prosthetic heart valve or intracardiac device require TEE regardless of TTE findings, as recommended by the European Heart Journal 1, 2, 5
• The European Heart Journal suggests that previous history of infective endocarditis, new or changing cardiac murmur, signs of heart failure, embolic events, persistent bacteremia, and persistent fever are indications for mandatory echocardiography 1, 6

Echocardiography Protocol

• The European Heart Journal recommends starting with transthoracic echocardiography (TTE) as first-line imaging, with a sensitivity of 70% for native valve vegetations but only 50% for prosthetic valves 1, 2, 7
• TEE is recommended if TTE is negative but clinical suspicion remains high, TTE is non-diagnostic or suboptimal quality, prosthetic valve or intracardiac device is present, or TTE is positive to evaluate for complications 1, 2, 5, 6

Clinical Context for E. cloacae

• Elderly and immunocompromised patients may have atypical presentations with less prominent fever, requiring a lower threshold for echocardiography, as suggested by the Praxis Medical Insights 6