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Patients with hypertrophic cardiomyopathy (HCM) and left ventricular outflow tract (LVOT) obstruction who remain symptomatic despite optimal medical therapy may undergo a septal myectomy (Morrow procedure). This procedure involves excising a portion of the hypertrophied septum below the aortic valve using a heart-lung machine to improve blood flow through the LVOT. Effective preoperative and postoperative nursing management ensures successful patient outcomes, minimizes complications, and...
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Related Experiment Video

Updated: May 7, 2026

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Long-term outcomes after the arterial switch operation.

Zhangwei Wang1,2, Ma Kai1, Shoujun Li1

  • 1Department of Cardiovascular Surgery, Chinese Academy of Medical Sciences and Peking Union Medical College, National Center for Cardiovascular Diseases, Fuwai Hospital, Beijing, China.

Cardiology in the Young
|April 17, 2024
PubMed
Summary

This study evaluated the arterial switch operation (ASO) and found that neoaortic sinotubular junction reconstruction may reduce late complications like aortic valve regurgitation and root dilation. Careful follow-up is crucial for patients with specific risk factors after ASO.

Keywords:
aortic root dilationarterial switch operationneoaortic sinotubular junction reconstructionnew aortic valve regurgitationrisk factorstransposition of the great arteries

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Area of Science:

  • Cardiovascular Surgery
  • Pediatric Cardiology
  • Congenital Heart Disease

Background:

  • The arterial switch operation (ASO) is a primary surgical treatment for transposition of the great arteries.
  • Long-term outcomes of ASO can be affected by complications such as aortic valve regurgitation and aortic root dilation.
  • Identifying risk factors and evaluating novel techniques are crucial for improving ASO patient prognosis.

Purpose of the Study:

  • To assess the 16-year experience with ASO at Beijing Children's Hospital.
  • To determine early and late mortality, morbidity, and reintervention rates following ASO.
  • To evaluate the efficacy of neoaortic sinotubular junction reconstruction in reducing late ASO complications.

Main Methods:

  • Retrospective analysis of 185 patients undergoing ASO (2006-2022) at Beijing Children's Hospital.
  • Comparison with 30 patients undergoing modified ASO with neoaortic sinotubular junction reconstruction at Fuwai Hospital.
  • Propensity score matching was employed to compare outcomes between groups.

Main Results:

  • Early and late mortality rates were 7.03% and 3.01%, respectively.
  • Significant incidences of new aortic valve regurgitation (11.45%), aortic root dilation (16.87%), and right ventricular outflow tract obstruction (19.88%) were observed.
  • Neoaortic sinotubular junction reconstruction was associated with significantly lower rates of aortic valve regurgitation and aortic root dilation compared to standard ASO.

Conclusions:

  • Late complications including aortic valve regurgitation, aortic root dilation, and right ventricular outflow tract obstruction are significant concerns after ASO.
  • Neoaortic sinotubular junction reconstruction appears to mitigate the risk of these late complications, improving long-term prognosis.
  • Close monitoring of neo-aortic valve and root function is essential, particularly for high-risk patients.