Decellularized aortic homografts versus mechanical composite grafts for aortic root replacement

Area of Science:

• Cardiovascular Surgery
• Biomaterials Science
• Regenerative Medicine

Background:

• Mechanical composite valve grafts (MCVGs) are standard for aortic root replacement in young adults.
• Decellularized aortic homografts (DAH) offer a potentially less thrombogenic alternative.
• Comparing MCVGs and DAH is crucial for optimizing treatment strategies.

Purpose of the Study:

• To compare the survival and valve-related adverse events of MCVGs versus DAH for aortic root replacement.
• To evaluate the efficacy and safety of DAH as a novel treatment option.
• To inform clinical decision-making for young adult patients requiring aortic root repair.

Main Methods:

• Single-center retrospective cohort study.
• Inclusion of patients undergoing elective aortic root replacement with MCVG or DAH between 2000-2022.
• Exclusion of urgent or emergent procedures.

Main Results:

• The study included 289 patients (MCVG: 216, DAH: 73).
• Cumulative survival at 3 years was 94% for MCVG and 99% for DAH (P=0.15).
• Bleeding and thromboembolism occurred only in the MCVG group. Moderate structural valve deterioration was observed in 5% of DAH cases (P≤0.001).
• The composite incidence of valve-related adverse events was significantly higher in the MCVG group (P=0.0295).

Conclusions:

• Both MCVGs and DAH demonstrated low mortality in elective aortic root replacement.
• DAH offered significantly higher freedom from valve-related adverse events compared to MCVGs.
• DAH is a promising option for young patients, but long-term durability data are required.