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Glenn shunt: long-term results and current role in congenital heart operations
Insights
Glenn shunts are effective for selected cyanotic heart defect patients, especially as a staged procedure before the Fontan procedure. Long-term outcomes show minimal pulmonary complications and improved survival rates.
Area of Science:
- Pediatric Cardiology
- Congenital Heart Disease Surgery
Background:
- Congenital cyanotic heart defects require surgical palliation.
- The Glenn shunt is a palliative surgical procedure used in managing complex cyanotic heart disease.
Purpose of the Study:
- To evaluate the long-term outcomes and safety of the Glenn shunt in pediatric patients with cyanotic heart defects.
- To assess the incidence of pulmonary complications and the efficacy of the Glenn shunt as a staged procedure prior to the Fontan procedure.
Main Methods:
- Retrospective analysis of 50 cyanotic patients (2 days to 22 years) who underwent Glenn shunts.
- Assessment of operative mortality, long-term survival, and complications including intrapulmonary shunting.
- Evaluation of subsequent procedures like Blalock-Taussig shunts and Fontan procedures.
Main Results:
- Operative mortality was higher in infants under 4 months (13/15).
- Long-term follow-up (0.9-14.8 years) showed no late deaths attributed to shunt complications.
- Minimal intrapulmonary shunting was observed; some patients required further palliation (Blalock-Taussig or Fontan procedures).
Conclusions:
- Glenn shunts can be a safe and effective staged procedure for selected patients with cyanotic heart defects.
- Pulmonary abnormalities are not an inevitable consequence of Glenn shunts.
- The Glenn shunt can be a valuable component in the surgical management pathway towards a Fontan procedure.
Abstract:
Fifty cyanotic patients (aged 2 days to 22 years) underwent Glenn shunts for tricuspid atresia and other cyanotic heart defects. Thirteen of 15 operative deaths occurred in infants less than 4 months old, and only 1 death has occurred in the last 9 years. Results were poor in patients with Ebstein's anomaly, truncus arteriosus, transposition of the great vessels, and complex defects other than tricuspid atresia and univentricular heart. Of the 35 patients followed from 0.9 to 14.8 years, 12 were followed for more than 10 years. None of the 11 late deaths could be attributed to complications of the shunt. Minimal evidence of intrapulmonary shunting was found by angiography, pulmonary venous oximetry, or radioisotopic studies. Late deterioration due to venous collaterals and decreased flow to the opposite lung necessitated Blalock-Taussig shunts in 6 and Fontan procedures in 10. All survived the Fontan procedures with minimal morbidity. These data support the concept that Glenn shunts do not necessarily result in pulmonary abnormalities and may be indicated as a staged procedure in a few selected patients prior to a Fontan procedure.