4D flow cardiovascular magnetic resonance for the assessment of aortic valve repair with ozaki technique

Abstract

Abstract Funding Acknowledgements Type of funding sources: None. Background Aortic valve neocuspidalization (Av-Neo) aims to replace the three aortic cusps with autologous pericardium pre-treated with glutaraldehyde and is becoming a valid alternative to traditional aortic valve replacement (AVR). 4D-flow cardiac magnetic resonance (4D-CMR) imaging of patients allows the derivation of shear stress on the aortic wall (WSS). Different studies support the presence of a link between increased WSS at 4D-CMR and the presence of histological alterations of the aortic wall. Purpose To compare the WSS of the ascending aorta in patients who underwent Av-Neo vs AVR with biological prostheses. Methods We performed 4D-flow CMR on 20 patients who underwent AV-Neo (Group A) or AVR (Group B), 10 patients for each group. Results The WSS in the Ozaki group was significantly lower in the proximal and distal aortic outer curvature compared to AVR patients (p 0.0179 and 0.0412, respectively, Figure 1 and 2). WSS levels remained significantly lower at the proximal aorta’s outer curvature segment in the Av-Neo population, also after adjusting the WSS for the ejection fraction and the LVOT-Aorta angle (p 0.02). Conclusions Av-neo hemodynamical features showed to be non-inferior to the ones provided by the commercially available bioprosthetic valves. Av-Neo procedures may be considered in patients affected by collagenopathy and other predisposing risk factors for the development of ascending aortic aneurism and aortic dissection other than classical AVR.