Key result
The aortic annulus becomes significantly more circular during systole compared to diastole (eccentricity index 1.06 vs 1.12, p<0.01), with diameter variations of at least 2 mm during the cardiac cycle.
Cross-Sectional (n=40)
No
Cine-MRI reveals dynamic aortic annular dimensions; leaves open whether measurement timing alters TAVI prosthesis selection.
Background Imaging of the aortic annulus is paramount for the success of transcatheter aortic valve implantation (TAVI) to obviate prosthesis size mismatch. The aortic annulus is a dynamic structure with alterations of its ellipsoid shape during the cardiac cycle. The objective of this study was to investigate with cine-MRI the changes of the sagittal and coronal diameter of the aortic annulus and whether the point in time of measurement is relevant for prosthesis size selection.
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Boering et al. (2013) conducted a cross-sectional in Severe aortic stenosis (n=40). Systolic cardiac phase measurement vs. Diastolic cardiac phase measurement was evaluated on Eccentricity index (EI) of the aortic annulus (p=<0.01). The aortic annulus becomes significantly more circular during systole compared to diastole (eccentricity index 1.06 vs 1.12, p<0.01), with diameter variations of at least 2 mm during the cardiac cycle.
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