Structural abnormalities after aortic root replacement with stentless xenograft.

Area of Science:

• Cardiovascular Surgery
• Medical Imaging
• Biomedical Engineering

Background:

• The Freestyle stentless bioprosthesis is a key treatment for complex aortic root disease.
• Assessing post-implantation abnormalities is vital for patient outcomes.

Purpose of the Study:

• To determine the prevalence of structural and functional abnormalities after full-root Freestyle bioprosthesis implantation.
• To evaluate the clinical impact of these abnormalities.

Main Methods:

• A 2-center, cross-sectional study with clinical follow-up of 253 patients implanted between 1999-2017.
• Utilized transthoracic echocardiography (TTE) and 4-dimensional cardiac computed tomography (4DCT) for assessment.
• Median follow-up was 3.3 years pre-4DCT and 1.4 years post-4DCT.

Main Results:

• Abnormalities were identified in 46% of patients, including pseudoaneurysms (13%) and coronary ostial stenosis (21%).
• Transthoracic echocardiography (TTE) had limited sensitivity for detecting pseudoaneurysms.
• 4DCT-identified abnormalities were linked to a 4.2-fold increased risk of reintervention (10% overall).

Conclusions:

• Structural and functional abnormalities are frequent post-Freestyle implantation.
• Transthoracic echocardiography (TTE) is insufficient for comprehensive follow-up.
• Abnormalities may correlate with increased reintervention and adverse outcomes, warranting further investigation.