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Modified Fontan procedure for severe Ebstein's malformation with predominant tricuspid stenosis
Insights
This study presents a modified Fontan procedure for severe Ebstein's malformation in two children. The surgical technique effectively improved cyanosis and right ventricular function, offering a viable treatment option.
Area of Science:
- Pediatric Cardiology
- Congenital Heart Disease Surgery
- Cardiac Anatomy
Background:
- Ebstein's malformation is a rare congenital heart defect affecting the tricuspid valve.
- Severe cases can lead to progressive cyanosis and right ventricular dysfunction.
- Surgical intervention is often necessary for symptomatic patients.
Purpose of the Study:
- To describe a modified Fontan procedure for severe Ebstein's malformation with tricuspid stenosis.
- To evaluate the surgical outcomes and long-term efficacy in pediatric patients.
Main Methods:
- Preoperative angiography to assess tricuspid valve anatomy and obstruction.
- Surgical excision of dysplastic leaflets causing obstruction.
- Creation of an atriopulmonary truncal connection (modified Fontan procedure).
- Postoperative assessment using angiography and Doppler echocardiography.
Main Results:
- Successful surgical correction in two pediatric patients (aged 7 and 6 years) with severe Ebstein's malformation.
- Significant improvement in arterial oxygen saturation from 70% to 95%.
- Restored functional class I status post-operation.
- Demonstrated effective systolic and diastolic blood flow patterns via atriopulmonary connection on imaging.
Conclusions:
- The modified Fontan procedure is an effective surgical strategy for select pediatric patients with severe Ebstein's malformation and tricuspid stenosis.
- This approach addresses leaflet obstruction and establishes adequate systemic-to-pulmonary circulation.
- Long-term follow-up indicates stable and favorable hemodynamic results.
Abstract:
Two children, aged 7 and 6 years, had severe Ebstein's malformation of the tricuspid valve and underwent operation because of progressive cyanosis (saturation, 70%). Preoperative angiography demonstrated linear attachment of the distal edges of the displaced anterosuperior and mural leaflets, leaving only a "keyhole" communication between the atrialized and functional portions of the right ventricle. Operation was directed toward completely excising these dysplastic leaflets, which were obstructing the flow of blood. The continuity between the functional right ventricle and pulmonary trunk was left intact. In addition, an atriopulmonary truncal connection was established. Postoperatively, both children were in functional class I with arterial saturation of 95%. Angiography and Doppler echocardiography demonstrated that there was a dominant phase of systolic flow of blood up the pulmonary trunk from the right ventricle, and also diastolic filling of the pulmonary arteries through the atriopulmonary truncal connection. The filling patterns did not change over time for the follow-up period of 4 and 1.5 years, respectively. This modified Fontan procedure appears to be an effective surgical alternative for some patients with severe Ebstein's malformation and predominant tricuspid stenosis.