Evaluation Of Myocardial Function At Systolic Phase Of Left Ventricle In Premature Ventricular Contractions With Omni-directional M-mode Echocardiography

Objective:1. 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) .2. Comparing the Omni-directional M-mode echocardiography with other kinds of echocardiographies to explore its application on assessing myocardial function.Methods:Object: 30 normal subjects(group A),30 patients with PVCs without structural heart diseases(group B) and 30 with PVCs and structural heart diseases(group C). Equipment: Using GE Vivid Seven Demision ultrasound system with Echo PAC work staion and LEJ-2 omni-directional M-mode echocardiography which was developed by Biomedical Engineering Institute of Fuzhou University in China. Measurement: (1) 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 PVCs beats respectively. (2) The myocardial motion velocity and acceleration of epicardial and endocardial and force of the peak systolic phase were measured during sinus beats and PVCs beats respectively by OME.Results:1. The measurements derived from OME correlated well with those from QTVI(r=0.777~0.845).2. The parameters of mitral annular velocity on group B and group C patients during PVC beats were decreased significantly.3. The velocity and acceleration of epicardial and endocardial and force in Group B during PVC beats were obviously higher than those during sina beats in the papilla muscle plane of left ventricular short-axis regions. The velocity and acceleration of epicardial and endocardial and force in Group C were no significant change. Conclusions:1. Omni-directional M-mode Echocardiography can accurately reflect the change of global and regional function in patients with premature ventricular contractions.2. It is valuable to assess regional myocardial function during PVC beats in patients with structural heart diseases or not.