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Avoidance of subaortic obstruction in staged management of single ventricle
M L Jacobs1, J Rychik, M T Donofrio
1Division of Cardiothoracic Surgery, Children's Hospital of Philadelphia, Pennsylvania 19104, USA.
Insights
Early surgical connection of the pulmonary artery to the aorta prevents subaortic obstruction in single ventricle patients. This strategy avoids complications and improves outcomes for complex congenital heart disease.
Area of Science:
- Pediatric Cardiology
- Congenital Heart Surgery
- Cardiovascular Physiology
Background:
- Subaortic obstruction frequently complicates single-ventricle anatomy.
- Connections between the ventricle and aorta can become restrictive, posing surgical risks.
- This obstruction is a known risk factor in single-ventricle reconstructive surgery.
Purpose of the Study:
- To evaluate the efficacy of early pulmonary artery-aorta amalgamation in preventing subaortic obstruction.
- To assess the impact of this surgical strategy on outcomes in single-ventricle patients.
Main Methods:
- Routinely amalgamated proximal main pulmonary artery with ascending aorta and arch in neonates/infants.
- 29 patients with single ventricle and subaortic obstruction underwent staged procedures (Norwood or pulmonary artery band, then hemi-Fontan).
- Data collected from September 1990 to September 1994.
Main Results:
- 18 patients completed Fontan operation without mortality.
- No patients developed subaortic obstruction post-operatively.
- Pulmonary valve insufficiency was mild or absent in all patients.
Conclusions:
- Early amalgamation of the pulmonary artery with the aorta effectively prevents subaortic obstruction.
- This surgical approach mitigates risks associated with subaortic obstruction in single-ventricle patients.
- The strategy offers a promising solution for managing complex single-ventricle physiology.
Background:
Subaortic obstruction is a frequent accompaniment of single-ventricle anatomy. Most often, the aorta arises from an outflow chamber that is connected to the single ventricle by a bulboventricular foramen or ventricular septal defect. This connection may be restrictive of flow at birth, or may become obstructive after surgical procedures that reduce the volume work of the ventricle. Subaortic obstruction is recognized as a risk factor for reconstructive surgical procedures for single ventricle.
Methods:
To prevent the consequences of subaortic obstruction, we have routinely amalgamated the proximal main pulmonary artery with the ascending aorta and arch early in the management of these patients. From September 1990 through September 1994, 29 neonates and infants with single ventricle and established or potential subaortic obstruction underwent staged reconstructive surgical procedures. The initial operation in the newborn period was a Norwood procedure (18 patients) or a pulmonary artery band (5 patients). All survivors underwent a hemi-Fontan procedure at approximately 6 months.
Results:
Eighteen patients have undergone a completion Fontan operation with no deaths. Five await completion Fontan. None has subaortic obstruction, and none has pulmonary valve insufficiency that is graded more than mild.
Conclusions:
Early association of the proximal main pulmonary artery with the ascending aorta appears to obviate the risks and complications associated with subaortic obstruction in patients with single ventricle.