  Left ventricular torsion from helically oriented myofibers is a key parameter
of cardiac performance. Physicians observing heart motion on echocardiograms,
during cardiac catheterization, or in the operating room, are impressed by the
twisting or rotary motion of the left ventricle during systole. Conceptually,
the heart has been treated as a pressure chamber. The rotary or torsional
deformation has been poorly understood by basic scientists and has lacked
clinical relevance. The aim of this paper attempts to discuss about this
question: Is ventricular twisting related to ventricular fiber arrangement?
That is dependent to an assumed model of the left ventricular structure.
