Clinical Scenario:
A 3-year-old girl presents with recurrent chest infections and poor weight gain since infancy. She was diagnosed with a moderate-sized perimembranous VSD at 6 months of age and has been on regular follow-up without surgical intervention, as she remained asymptomatic until recently. On examination: weight is at the 10th centile, RR 32/min, grade 3/6 pansystolic murmur at the left lower sternal border, and no cyanosis or clubbing. Echocardiography shows the VSD size unchanged at 6 mm, mild LA/LV dilatation, and normal PA pressure. She has now had her third episode of lower respiratory tract infection in the past 6 months.
What is the most appropriate next step in management?
A. Add ACE inhibitors and reassess in 3 months
B. Continue observation as the defect is small
C. Perform cardiac catheterization for shunt quantification
D. Refer for elective surgical closure
E. Start prophylactic antibiotics for recurrent infections
Correct answer & Explanation:
Correct Answer: D — Refer for elective surgical closure
Explanation:
Why D is correct: A moderate VSD causing recurrent respiratory infections and growth impairment, despite normal PA pressures, is a clinical indication for elective surgical closure. Recurrent LRTIs in a child with a hemodynamically significant VSD reflect ongoing pulmonary overcirculation and warrant intervention rather than continued observation.
Why others are wrong:
- A — She isn’t in overt heart failure requiring afterload reduction; medical therapy won’t address the underlying anatomical problem causing recurrent infections.
- B — A 6 mm VSD is moderate, not trivial, and the recurrent infections plus growth concerns indicate it is hemodynamically significant — observation alone is inappropriate now.
- C — Catheterization is reserved for cases with suspected elevated/irreversible pulmonary vascular resistance; here PA pressure is normal and echo findings are sufficient to guide surgery.
- E — Antibiotic prophylaxis treats a consequence, not the underlying defect, and doesn’t address the indication for closure
