Study on myocardial acceleration of the normal left ventricular wall by velocity vector imaging

0bjective To investigate the characteristics of myocardial acceleration (ACC) in normal left ventricle(LV)by velocity vector imaging (ⅤⅥ). Methods The myocardial velocities of sixteen LV wall segments in fifty normal volunteers were detected by ⅤⅥ.Segmental myocardial ACC was calculated by using special software and the distribution of ACC in LV wall was analyzed.Results There were significant differences among the levels of LV in the early systolic peak ACC (ACCs) and early diastolic peak ACC (ACCd),and both of ACCS and ACCd increased from apex to base in the same LV wall (allP＜0.05). However,there were no significant differences among six LV walls at the same level in ACCs and ACCd(allP＞0.05).In the same segment,ACCd was significantly higher than ACCs (all P＜0.05).Conclusions Myocardial ACC can be detected by ⅤⅥ.which is the basis for further investigation of ACC in the diseased myocardium. Key words: Echocardiography; Ventricular function,left; Myocardial contraction; Acceleration; Velocity vector imaging