Evaluation of myocardial function at systolic phase of left ventricle in premature ventricular contractions with Omni-directional M-mode Echocardiography

Objective To evaluate the movement function of left ventricular at systolic phase with Omni-directional M-mode Echocardiography(OME)in patients with premature ventricular contractions(PVCs).Methods 60 PVCs patients were divided into two groups:30 PVCs patients without structural heart diseases(Group A),other 30 PVCs patients with structural heart diseases(Group B).The mitral annular velocities were measured by OME and quantitative tissue velocity imaging(QTVI)respectively.All values of patients with PVCs were recorded during sinus beats and PVC beats respectively.The myocardial motion acceleration of epicardium and endocardium and force of the peak systolic phase were measured during sinus beats and PVC beats respectively.Results(1)The parameters of mitral annular velocity on group A and group B patients during PVC beats were decreased significantly.(2)The velocity and acceleration of epicardium and endocardium and force in group A during PVC beats were obviously higher than those during sinus beats at the papillary muscle level of parasternal left ventricular short-axis views.The velocity and acceleration of epicardium and endocardium and force in group B had no significant change.Conclusions(1)OME can accurately reflect the change of global and regional function in patients with PVCs.(2)It is valuable to assess regional myocardial function during PVC beats in patients with structural heart diseases or not.