Surgical results in subaortic stenosis.

Area of Science:

• Cardiology
• Cardiac Surgery
• Pediatric Cardiology

Background:

• Subaortic stenosis is a significant cause of left ventricular outflow tract obstruction.
• Surgical intervention is often necessary to relieve this obstruction.

Purpose of the Study:

• To evaluate the long-term outcomes of surgical resection for subaortic stenosis.
• To assess the effectiveness of surgery in improving patient functional class and survival rates.
• To identify risk factors and adverse events associated with the surgical treatment.

Main Methods:

• Retrospective analysis of 46 patients undergoing subaortic stenosis resection from 1965 onwards.
• Assessment of preoperative and postoperative New York Heart Association (NYHA) functional class.
• Measurement of peak systolic gradients via cardiac catheterization.
• Actuarial survival and event-free survival analysis.
• Evaluation of postoperative complications including aortic regurgitation and restenosis.

Main Results:

• Significant reduction in peak systolic gradients post-surgery (93.15 to 21.61 mm Hg, P=0.001).
• Improvement in NYHA class for most patients (21 Class I pre-op to 36 Class I post-op).
• Adverse events (aortic regurgitation, restenosis, death) were associated with higher residual gradients (55.78 mm Hg vs. 14.61 mm Hg, P=0.001).
• Actuarial survival rate of 91% at 1-12 years and 79% at 13-18 years.
• Event-free survival was 45% up to 18 years.

Conclusions:

• Surgical resection of subaortic stenosis is effective in improving patient functional status and survival.
• Long-term surveillance is essential to detect and manage recurrent obstruction and other complications.
• Higher postoperative gradients correlate with increased risk of adverse events, underscoring the need for optimal surgical results.