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Abstract #3444

Evaluation of aortic viscous energy loss, kinetic energy and association with pumping function in congenital patients with transposition of great arteries using time-varying aortic geometry: Volumetric 4D Flow MRI Analysis

Covadonga Terol Espinosa de los Monteros1, Roel L.F. Van der Palen1, Arno A.W. Roest1, Pieter J. Van den Boogaard2, Lucia J.M. Kroft2, Westenberg J.M. Jos2, and Mohammed S.M. Elbaz2

1Pediatric Cardiology, Leiden University Madical Ceneter, Leiden, Netherlands, 2Radiology, Leiden Univeristy Medical Center, Leiden, Netherlands

Aortic hemodynamic energetics including kinetic energy (KE) and non-turbulent viscous energy loss (EL) and the association with cardiac function were evaluated in 8 TGA patients after arterial switch operation (ASO) and in 8 healthy individuals by 4D flow MRI. EL was significantly increased in TGA compared to healthy volunteers and aortic regions of highest levels indicate influence of complex ASO-related aortic geometry on blood flow efficiency. Significant positive correlation between aortic EL and cardiac index was found. Understanding the impact of ASO on aortic blood flow efficiency might enable insights on ways to improve operative procedure for TGA in future.

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