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Accessory mitral valve tissue causing severe subaortic stenosis with dextrocardia in a premature newborn
The Thoracic and Cardiovascular Surgeon
|October 16, 1999
Summary
A rare congenital heart defect involving accessory mitral valve tissue caused severe left-ventricular outflow obstruction in a premature infant. Early surgical intervention is crucial for managing this condition and preventing acute deterioration.
Area of Science:
- Pediatric Cardiology
- Congenital Heart Disease
- Cardiac Surgery
Background:
- Accessory mitral valve tissue is a rare congenital anomaly.
- It can lead to significant left-ventricular outflow obstruction (LVOTO).
- Associated anomalies like dextrocardia and ventricular septal defect (VSD) can complicate presentation.
Observation:
- A 7-day-old premature infant presented with a heart murmur and was diagnosed with LVOTO.
- Echocardiography revealed accessory mitral valve tissue causing a 100 mmHg systolic gradient.
- The infant also had dextrocardia and a VSD.
Findings:
- The infant experienced respiratory arrest and syncope, necessitating emergency surgery.
- Surgical excision of accessory mitral valve tissue and VSD closure were performed.
- The combined aortotomy and interatrial approach facilitated anatomical evaluation and successful resection.
Implications:
- Early surgical management of accessory mitral valve tissue is critical due to the risk of acute deterioration.
- Prompt diagnosis and intervention can improve outcomes in infants with complex congenital heart disease.
- The described surgical approach is effective for complex mitral valve anomalies.