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A new operation for far-advanced cystic medial necrosis of the aortic root
Insights
A novel surgical technique using a composite aortic valve prosthesis effectively treated aortic root enlargement and severe aortic regurgitation in three patients. Two patients remain asymptomatic long-term, demonstrating the procedure
Area of Science:
- Cardiovascular Surgery
- Biomedical Engineering
Background:
- Cystic medial necrosis can cause aortic root enlargement and severe aortic regurgitation.
- Standard surgical options may be limited for extensive aortic root pathology.
Observation:
- A new surgical approach involved creating a composite prosthesis by attaching a circular knitted polyester graft to a Björk-Shiley valve.
- This composite prosthesis matched the aortic root diameter and was used for valve replacement.
- In two cases, the ascending aorta was replaced with a cone-shaped graft.
Findings:
- The composite prosthesis, exceeding 50 mm in diameter, was successfully implanted in all three patients.
- Two patients experienced excellent long-term outcomes, remaining asymptomatic for over two years.
- One patient experienced a fatal ventricular arrhythmia on postoperative day 23.
Implications:
- This technique offers a potential solution for complex aortic root reconstructions.
- Further research is warranted to refine this surgical approach and assess long-term efficacy and safety.
- The study highlights the feasibility of custom-designed composite prostheses for aortic valve and root replacement.
Abstract:
Three patients with far-advanced cystic medial necrosis of the aorta, which had produced giant bulbous enlargement of the aortic root and severe aortic regurgitation, were operated on using a procedure not previously described. Measurements of the aortic valve annulus and ascending aorta were made from aortograms. A knitted polyester arterial prosthesis was sewn together to form a circle. This circular prosthesis was sewn to a 31 mm Björk-Shiley aortic valve prosthesis in the way that a tire is fitted onto a wheel. The resulting composite prosthesis, which had the same diameter as the aortic root, was used to replace the excised valve. In all cases a composite prosthesis measuring greater than 50 mm in diameter was used. In 2 of the 3 patients the ascending aorta was replaced with a tubular graft reshaped as a truncated cone. This reshaping was done by inserting multiple gussets into one end of the aortic prosthesis so that the flanged end fit precisely to the transverse aortic arch. Two patients are asymptomatic more than two years following operation. The third patient died suddenly of a ventricular arrhythmia on the twenty-third postoperative day.