Abstract
Right ventricular (RV) outflow tract (RVOT) is a common site of ventricular arrhythmias in the athlete’s heart. In the present study, Gülan et al (Sci Rep 2019;9:100, PMID 30643204) tested the roles of RVOT in ventricular arrhythmias during exercise when the thin-walled RVOT is expected to be exposed to high wall shear stress (WSS). Phase contrast magnetic resonance imaging was used to obtain RV and RVOT flow patterns from 2 healthy athletic male proband’s hearts and 2 patients with arrhythmogenic right ventricular cardiomyopathy/dysplasia. The authors showed that there was an increased WSS in the RVOT relative to the rest of the RV in both healthy and diseased hearts. However, the diseased hearts showed higher peak WSS magnitudes. The authors conclude that exercise as well as anatomical and functional remodeling might alter RV wall shear stress both in magnitude and in spatial distribution, leading to increased hemodynamic stress in the RVOT.
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