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The Journal of Thoracic and Cardiovascular Surgery, Vol 89, 907-913, Copyright © 1985 by The American Association for Thoracic Surgery and The Western Thoracic Surgical Association

ARTICLES

Surgical treatment of subpulmonary obstruction in transposition of the great arteries by means of a left ventricular-pulmonary arterial conduit. Late results and further considerations

G Crupi, R Pillai, L Parenzan and C Lincoln

Between January, 1976, and June, 1983, 16 patients with transposition of the great arteries and fixed subpulmonary obstruction underwent repair by means of a combined Mustard procedure and placement of a conduit between the left ventricle and main pulmonary artery. Their mean age and weight were 5.3 years and 19 kg. Ten patients had an intact ventricular septum and six had a ventricular septal defect, which because of its size or location precluded a Rastelli repair. A fibromuscular tunnel was the most common type of subpulmonary obstruction (10/16, 62%). There were three early deaths and one late death. Early cardiac catheterization (mean interval from operation, 45 days), performed in 10 of 13 survivors, showed a significant decrease in the mean left ventricular-pulmonary arterial gradient from 66 to 8.5 mm Hg. Late cardiac catheterization (mean interval from operation, 4 years) showed continuing relief of the subpulmonary obstruction with a mean increase in peak systolic transconduit pressure gradient of 6.4 mm Hg. This procedure is an option to direct relief in the management of severe fixed subpulmonary obstruction in patients with transposition and intact ventricular septum or in the presence of a ventricular septal defect when a Rastelli repair is precluded.

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