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The Journal of Thoracic and Cardiovascular Surgery, Vol 92, 908-912, Copyright © 1986 by The American Association for Thoracic Surgery and The Western Thoracic Surgical Association

ARTICLES

Tetralogy of Fallot with subarterial ventricular septal defect. Diagnostic and surgical considerations

FJ Vargas, GO Kreutzer, M Pedrini, H Capelli and A Rodriguez Coronel

Since 1964, 77 patients underwent repair for tetralogy of Fallot with subarterial ventricular septal defect. Median age at operation was 5 years. Cyanosis was commonly mild, and hypoxic episodes were infrequent. Accordingly, only 12 patients (15.58%) needed either palliative or corrective operations before the age of 2 years. Characteristic angiographic and echocardiographic features were observed, which allowed this entity to be differentiated from either classic tetralogy or other types of double-outlet right ventricle. The earliest series of operations (in which no right ventricular outflow patch was used) was followed by a prohibitive mortality (50%). Residual subpulmonary obstruction was the cause of all of these deaths. In a second series of patients, a transannular patch was frequently used (79.59%), with the rationale that closure of the ventricular septal defect would make restrictive the deficient infundibulum of these patients. In a later series, we observed that most of the patients had a nonrestrictive pulmonary anulus (80%); the patch therefore was limited to the ventriculotomy. In the absence of pulmonary annular hypoplasia, the need for patching of the right ventricular outflow tract in this entity has to be confined to preventing the subpulmonary obstruction induced by closure of the ventricular septal defect. A considerable improvement in the results followed our first series (4.3% mortality). Follow-up of the survivors (mean 7 years) has been satisfactory.

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