Torsion Dynamics in the Evolution from Acute to Chronic Mitral Regurgitation
Frederick A. Tibayan MD, Kwok L. Yun MD, David T.M. Lai MD, Tomasz A. Timek MD, George T. Daughters MD, Neil B. Ingels MD, D. Craig Miller MD

Using implanted radio-opaque markers, left ventricular torsion was assessed in an experimental model of surgically induced mitral regurgitation. The progression from acute to chronic mitral regurgitation was associated with decreased and delayed maximal torsion and a decline in early diastolic recoil.