Pulmonary hypertension in infancy: a reversible cause

Area of Science:

• Pediatric Cardiology
• Congenital Heart Disease
• Pulmonary Hypertension

Background:

• Pulmonary hypertension (PH) in infants often stems from conditions like bronchopulmonary dysplasia.
• Accurate diagnosis is crucial as some causes of PH are reversible.

Observation:

• A healthy infant presented with respiratory distress and severe PH of unclear origin.
• Pulmonary vasodilators were administered to reduce right ventricular afterload.
• Imaging identified a supravalvular mitral ring as the underlying cause of PH.

Findings:

• Surgical resection of the supravalvular mitral ring membrane resolved the PH.
• Supravalvular mitral ring is a rare left-sided congenital heart lesion.
• Concurrent atrial septal defects can mask the left ventricular inflow gradient, complicating diagnosis.

Implications:

• Early and accurate diagnosis of supravalvular mitral ring is vital for appropriate treatment.
• Misdiagnosis can lead to inappropriate use of pulmonary vasodilators, potentially worsening the infant's condition.
• This case underscores the importance of considering rare congenital heart defects in the differential diagnosis of infant PH.