MCQ: Infective Endocarditis Complication

Key: C — Emergency cardiac surgery

Explanation:

This child has developed acute severe mitral regurgitation with pulmonary edema (heart failure) as a complication of infective endocarditis (IE) — most likely due to valve leaflet perforation, chordal rupture, or destruction of the valve apparatus by the infective process.

Why emergency surgery (C) is correct:

According to major IE guidelines (AHA 2015, ESC 2015/2023), the development of heart failure due to severe valve regurgitation/dysfunction is one of the strongest and most urgent indications for surgical intervention in IE, regardless of whether the antibiotic course is complete.

Key surgical indications in IE include:

1. Heart failure due to severe valve dysfunction (AR or MR) — the most common indication for surgery in IE, and when it causes pulmonary edema or cardiogenic shock, surgery should be emergent (within 24 hours), not delayed.
2. Uncontrolled infection (abscess, persistent bacteremia/fever despite appropriate antibiotics)
3. Prevention of embolism (large vegetations, particularly after a prior embolic event)
4. Fungal or highly resistant organism endocarditis

In this case, acute severe MR → pulmonary edema represents hemodynamic decompensation, which carries a high risk of mortality if managed medically alone. Delaying surgery to “complete” antibiotics is not appropriate — mortality is significantly higher in patients with heart failure who don’t undergo timely surgery.

Why other options are wrong:

• A. Continue antibiotics only — Inadequate; antibiotics alone will not correct the mechanical valve damage causing pulmonary edema. Medical therapy alone in this setting carries high mortality.
• B. High-dose corticosteroids — No role in IE management; may even worsen infection control by immunosuppression. Not indicated.
• D. Pericardiocentesis — This patient has pulmonary edema from valve regurgitation, not pericardial tamponade. There’s no indication of pericardial effusion here; this is a distractor.
• E. Repeat blood cultures — Appropriate as part of ongoing monitoring/documentation of bacteremia clearance, but does not address the acute hemodynamic emergency at hand. It’s a reasonable adjunct, not the “most appropriate management” for this life-threatening complication.

Guidelines referenced:

1. Baddour LM, et al. Infective Endocarditis in Adults: Diagnosis, Antimicrobial Therapy, and Management of Complications — A Scientific Statement for Healthcare Professionals From the AHA. Circulation. 2015;132:1435–1486.
2. Habib G, et al. 2023 ESC Guidelines for the management of endocarditis. Eur Heart J. 2023;44:3948–4042.