Papillary muscles contraction does not change ventricular wall mechanics

Abstract

Papillary muscles play a crucial role to support valves in the ventricles. However, much less is known about the role in ventricular wall mechanics. Evidence in the literature is inconclusive, showing both of changes in wall strain and indications of no changes in strain after detachment of papillary muscles. We designed a high-resolution 3D model of canine ventricles to investigate the effects of papillary muscles on strain in the regions overlying papillary muscles. An anatomical model was obtained from in-vitro MRI and a realistic fiber geometry assuming transmural rotation in the ventricular wall. Boundary conditions were either: 1) the attached state in which movements of the papillary ..