Discrete Subaortic Stenosis: Surgical Outcome (2016-2022)


  • Kassem Mohammed Zaier MBChB, FICMS
  • Amjed Abdulridha Ahmed Alhilo MBChB, FICMS
  • Jalal Jaafar Abdulhussein


Associated anomalies, Aortic valve regurgitation, Subaortic stenosis Tachyarrhythmia, Reoperation


Background:        Discrete subaortic stenosis is a dynamic and presumably gained cardiac anomaly in which the left ventricular outflow tract is impeded by a subvalvular fibromucular band. This condition may occur as an isolated defect or be associated with other anomalies. Discrete subaortic stenosis remains a surgical challenge for the comparatively high prevalence of relapse of stenosis or evolution to aortic regurgitation. Objective:         To review surgical outcome in discrete subaortic stenosis and evaluate of additional risk of associated anomalies in surgical outcome. Methods:        Thirty-seven patients (16 males and 21 females) underwent surgical resection of subaortic membrane. Their data were collected and retrospectively studied from 1st of January 1999 to 1st of November 2017 at Ibn-Alnafees Teaching hospital for cardiothoracic surgery in Baghdad, Iraq. We divided the patients into two groups, group A: included eight patients who had isolated subaortic membrane and group B: included 29 patients who had associated anomalies. A comparison was made between the two groups according to preoperative variables and postoperative morbidity and mortality. Results:        Postoperative mitral valve injury, iatrogenic ventricular septal defect,residual subaortic stenosis and aortic valve injury were not observed in any patient. Post-operative complete heart blockwasseen in one patient only belong to group B (3.45%). Tachyarrhythmia post repair was founded intwo patients in group B (6.89%) versus no any patient in group A. There was no operative death, the mortality was (0%) in both groups. Conclusion:        Surgical outcome of resection subaortic membrane is excellent in early term with low morbidity and mortality whether it was isolated lesion or associated with other anomalies.


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