Left ventricular apical torsion and architecture are not inverted in situs inversus totalis

Progress in Biophysics and Molecular Biology
T DelhaasT Arts

Abstract

Occasionally, individuals have a complete, mirror-image reversal of their internal organ position, called situs inversus totalis (SIT). Whereas gross anatomy is mirror-imaged in SIT, this might not be the case for the internal architecture of organs, e.g. the myofiber pattern in the left cardiac ventricle. We performed a Magnetic Resonance Tagging study in nine controls and in eight subjects with SIT to assess the deformation pattern in the apical half of the LV wall. It appeared that both groups had the same LV apical deformation pattern. This implies that not only the superficial LV apical layers in SIT follow a normal, not inverted pattern, but the deeper layers as well. Apparently, the embryonic L/R controlling genetic pathway does determine situs-specific gross anatomy morphogenesis but it is not the only factor regulating fiber architecture within the apical part of the LV wall. We propose that mechanical forces generated in the not-inverted molecular structure of the basic right-handed helical contractile components of the sarcomere play a role in shaping the LV apex.

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Citations

May 15, 2013·Annual Review of Biomedical Engineering·A A Young, J L Prince
Mar 13, 2012·American Journal of Physiology. Heart and Circulatory Physiology·Richard J B FrancisCecilia Lo
Jul 26, 2012·Journal of Cardiovascular Magnetic Resonance : Official Journal of the Society for Cardiovascular Magnetic Resonance·Alistair A Young, Brett R Cowan
Jan 26, 2010·Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography·Lowell H FrankCecilia W Lo
Apr 15, 2008·Progress in Biophysics and Molecular Biology·Peter Kohl, Denis Noble
Apr 15, 2008·Progress in Biophysics and Molecular Biology·Paulus KirchhofLarissa Fabritz
May 21, 2015·Circulation. Cardiovascular Imaging·Alaa Mabrouk Salem OmarPartho P Sengupta
Dec 21, 2014·American Journal of Physiology. Heart and Circulatory Physiology·Alessandro C RossiTammo Delhaas
Apr 9, 2008·Progress in Biophysics and Molecular Biology·Stefan KlotzDaniel Burkhoff

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