Discrete Subaortic Stenosis: Surgical Outcome (2016-2022)

Abstract

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 1^st of January 1999 to 1^st 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.