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Extended aortic root replacement with aortic allografts.

R L McKowen, D N Campbell, G F Woelfel

The Journal of Thoracic and Cardiovascular Surgery

|March 1, 1987

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A novel extended aortic root replacement using cryopreserved aortic allografts effectively treats complex left ventricular outflow tract obstruction in pediatric patients. This advanced surgical technique shows promising results with low morbidity and mortality.

Area of Science:

Cardiovascular Surgery
Pediatric Cardiac Surgery
Aortic Valve Surgery

Background:

Complex left ventricular outflow tract obstruction (LVOTO) poses significant challenges in pediatric cardiac surgery, particularly after prior operations for subaortic stenosis or in cases of hypoplastic aortic annulus.
Existing surgical techniques often struggle to adequately address these complex anatomical issues, leading to persistent or recurrent obstruction.

Observation:

A new technique involving extended aortic root replacement with a cryopreserved aortic allograft was applied to three pediatric patients with complex LVOTO.
This innovative procedure integrates aortoventriculoplasty, aortic root replacement, and coronary artery reimplantation, utilizing the allograft to augment the interventricular septum and relieve subvalvular obstruction.

Findings:

The study reports successful outcomes in all three patients, including one with aortic stenosis and annular hypoplasia, and two with a history of subaortic stenosis operations.

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While one patient experienced mediastinitis requiring drainage, recovery was uncomplicated. Another patient had transient complete heart block, which resolved spontaneously.

The technique demonstrated encouraging functional results with no mortality and limited morbidity in this small cohort.

Implications:

Extended aortic root replacement with aortic allografts offers a viable and effective solution for complex pediatric LVOTO, addressing challenging anatomical configurations.
This modified surgical approach, incorporating aortoventriculoplasty and allograft use, provides a promising alternative for improving outcomes in previously difficult-to-treat cases.
Further research and larger studies are warranted to validate these findings and establish this technique as a standard of care.