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        Correlation of Aortic Valve Calcification Volume Using Cardiac-Gated Contrast-Enhanced CT with Aortic Stenosis Severity Using Echocardiographic Indices

        Pei Ing Ngam,Ching Ching Ong,Edgar Lik Wui Tay,Jimmy Kim Fatt Hon,Chongri Liang,Lynette Li San Teo 아시아심장혈관영상의학회 2021 Cardiovascular Imaging Asia Vol.5 No.3

        Objective: The aim of the study is to assess feasibility of using aortic valve calcification volume (AVCV) as a surrogate marker for aortic stenosis (AS) by studying the correlation between AVCV on contrast enhanced CT (CECT) and severity of AS using echocardiographic indices. Materials and Methods: Ninety-four patients with AS, who underwent CECT and echocardiography as part of pre-transcatheter aortic valve implantation assessment were analysed. AVC was quantified on CECT using methodology validated by Bischoff et al. Severity of AS was categorized by echocardiography indices [transaortic jet velocity, mean pressure gradient, aortic valve area (AVA) by continuity and planimetry equations, indexed AVA to body surface area and dimensionless index (DI)]. Results: Moderate to strong correlation was found between AVCV with transaortic jet velocity (rs=0.397, p<0.001), peak pressure gradient (rs=0.410, p<0.001) and mean pressure gradient (rs=0.381, p<0.001). There was statistically significant correlation between AVCV with indexed AVA (rs=-0.225, p<0.001) and DI (rs=-0.644 p<0.001) but not with AVA by continuity equation (rs=-0.024, p<0.826) and by planimetry (rs=-0.185, p<0.158). Although not statistically significant, patients with higher degree of AS were noted to have higher AVCV burden on CECT. Conclusion: Quantification of AVCV using CECT is a potential complementary marker for grading of AS severity. AVCV has additive value when there is discrepancy between clinical and echocardiography examinations or discordant echocardiographic indices due to variation in techniques of imaging and small body size in Asian population.

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