Left ventricular twist dynamics: principles and applications

摘要

The normal left ventricular (LV) shape has been assimilated to a thick walled prolate ellipsoid with its long axis directed from apex to base. The normal LV morphology is characterised by a high degree of regional heterogeneity. With the use of tagging magnetic resonance, a wide variation in circumferential and longitudinal radii of LV wall curvature has been shown, with a more oval shaped LV cavity in the short axis direction and more flattened LV wall towards the apex. In addition, a gradual thinning of the LV wall was noted toward the apex, whereas around the LV circumference, the posterolateral wall was significantly thicker than the septum.2 The law of Laplace and variations in the amount of longitudinally and cir-cumferentially oriented fibres have been used to explain the wide variation in the thickness of the LV wall.