Pediatrics A child with large perimembranous VSD has congestive hea failure. What may be the cause of improvement of failure in this patient A Aoic regurgitation B Vascular changes in pulmonary circulation C Infective endocarditis D Closure of VSD spontaneously 💡 Explanation A child with large perimembranous VSD has congestive hea failure. What may be the cause of improvement of failure in this patient ✓ Correct Answer: B. Vascular changes in pulmonary circulation