Erschienen in:
30.01.2020 | Cardiac
Surgically implanted aortic valve bioprostheses deform after implantation: insights from computed tomography
verfasst von:
Marguerite E. Faure, Dominika Suchá, Fides R. Schwartz, Petr Symersky, Ad J. J. C. Bogers, Jeffrey G. Gaca, Lynne M. Koweek, Linda M. de Heer, Ricardo P. J. Budde
Erschienen in:
European Radiology
|
Ausgabe 5/2020
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Abstract
Objective
Little is known about the prevalence and degree of deformation of surgically implanted aortic biological valve prostheses (bio-sAVRs). We assessed bio-sAVR deformation using multidetector-row computed tomography (MDCT).
Methods
Three imaging databases were searched for patients with MDCT performed after bio-sAVR implantation. Minimal and maximal valve ring diameters were obtained in systole and/or diastole, depending on the acquired cardiac phase(s). The eccentricity index (EI) was calculated as a measure of deformation as (1 − (minimal diameter/maximal diameter)) × 100%. EI of < 5% was considered none or trivial deformation, 5–10% mild deformation, and > 10% non-circular. Indications for MDCT and implanted valve type were retrieved.
Results
One hundred fifty-two scans of bio-sAVRs were included. One hundred seventeen measurements were performed in systole and 35 in diastole. None or trivial deformation (EI < 5%) was seen in 67/152 (44%) of patients. Mild deformation (EI 5–10%) was seen in 59/152 (39%) and non-circularity was found in 26/152 (17%) of cases. Overall, median EI was 5.5% (IQR 3.4–7.8). In 77 patients, both systolic and diastolic measurements were performed from the same scan. For these scans, the median EI was 6.5% (IQR 3.4–10.2) in systole and 5.1% (IQR3.1–7.6) in diastole, with a significant difference between both groups (p = 0.006).
Conclusions
Surgically implanted aortic biological valve prostheses show mild deformation in 39% of cases and were considered non-circular in 17% of studied valves.
Key Points
• Deformation of surgically implanted aortic valve bioprostheses (bio-sAVRs) can be adequately assessed using MDCT.
• Bio-sAVRs show at least mild deformation (eccentricity index > 5%) in 56% of studied cases and were considered non-circular (eccentricity index > 10%) in 17% of studied valves.
• The higher deformity rate found in bio-sAVRs with (suspected) valve pathology could suggest that geometric deformity may play a role in leaflet malformation and thrombus formation similar to that of transcatheter heart valves.