Evaluation of myocardial strain in normal subjects:two-dimensional strain vs tissue velocity imaging

Objective To investigate the consistency of two-dimensional strain(2DS)and tissue velocity imaging(TVI)in the measurement of myocardial strain and strain rate of normal subjects. Methods 2DS and TVI were performed in 30 healthy volunteers.Regional longitudinal peak systolic strain and strain rate were measured and compared by two methods from the apical four-chamber view,two-chamber view and the left ventricular long-axis view. Results Left ventricular two-dimensional longitudinal strain gradually increased from the base to apex,and strain rate was the highest in apex.Left ventricular longitudinal strain and strain rate were instable,and showed no clear law in all segments.The longitudinal strain and strain rate obtained by 2DS were significantly different from those obtained by TVI in the vast majority of segments(P0.05). Conclusion Left ventricular two-dimensional and tissue velocity imaging are inconsistent for determining longitudinal strain and strain rate from the base to apex.