Evaluation of left ventricular hemodynamical changes in hypertropic cardiomyopathy patient by vector flow mapping

Objective To evaluate the left ventricular hemodynimics and the overall systolic and diastolic function in hypertropic cardiomyopathy(HCM) patients by vector flow mapping(VFM).Methods Twenty-six HCM patients and 31 control subjects were enrolled in this study,their transverse and vertical diameter of vortex and the streamline caracteristic in rapid ejection,reduced ejection and isovolumic relaxation phase,along with the velocity gratient(ΔV) between the left ventricular outflow tract and papillary muscle level in rapid ejection were analyzed by VFM technique.Results ①Compared with control group,the vortex were bigger,more dispersed and lasted longer in HCM group in rapid ejection,reduced ejection and isovolumic relaxation phase.The transeverse and vetical diameter of vortex measured in HCM group were greater than that in control group,there was significant difference between two groups.②Streamline origniated and ended regularly in control group,but disordered streamline started and stopped at different sections of left ventricle in HCM group.③The velocity gradient in HCM group was higher than that in control group.Conclusion VFM can provide a visible hemodynamical change in left ventricle of HCM patients,and it can provide preference for early evaluation of cardiac function.