Surgery for bilateral outflow tract obstruction in elastin arteriopathy

Area of Science:

• Cardiology
• Pediatric Cardiology
• Vascular Surgery

Background:

• Williams syndrome and elastin arteriopathy often present with supravalvular aortic stenosis (SVAS) and pulmonary artery stenosis (PAS).
• Optimal surgical strategies for patients with co-existing SVAS and significant PAS remain debated.
• Understanding the impact of PAS severity on outcomes after SVAS repair is crucial for treatment planning.

Purpose of the Study:

• To investigate the effect of pulmonary artery stenosis severity on prognosis after surgery for supravalvular aortic stenosis.
• To inform treatment strategies for patients with severe forms of elastin arteriopathy.

Main Methods:

• Retrospective review of 33 patients with SVAS and significant PAS who underwent surgery between 1960 and 1999.
• Analysis of patient charts and current follow-up data to determine risk factors for survival and reoperation.
• Categorization of patients based on the severity of right-sided obstructions (moderate vs. severe PAS).

Main Results:

• Fifteen patients with moderate PAS underwent SVAS repair only; 18 with severe PAS had additional surgical relief for PAS or right ventricular outflow tract obstruction.
• Eight patients received preoperative balloon dilation for stenotic pulmonary arteries.
• Long-term survival at 20 years was 76%. Freedom from reintervention at 20 years was 49%. A right ventricular/descending aortic pressure ratio >= 1.0 indicated higher reintervention risk.

Conclusions:

• Surgical treatment for pulmonary artery obstructions in elastin arteriopathy is palliative.
• Combined surgical treatment and balloon dilation of peripheral pulmonary arteries offer good long-term survival for severe cases.
• Risk stratification based on pressure ratios can guide management decisions.