Assessment Of Global Left Ventricular Systolic And Diastolic Function In Dual-chamber Pacing By Quantitative Tissue Velocity Imaging

Objective To investigate application of quantitative tissue velocity imaging(QTVI) in assessing global left ventricular systolic and diastolic function in Dual-chamber Pacing by measuring the motion velocities of mitral annulars .Methods Fifties patients with Dual-chamber Pacemakers and 50 normal subjects were studied . The peak systolic mean velocity(Vs) , the peak early diastolic mean velocity(Ve) and the peak late diastolic mean velocity(Va) of the profiles achieved by QTVI were measured at six mitral annular sites from 2-dimensional echocardiograms . The average Vs were compared with left ventricular cardiac output(LVCO), while the average Ve/Va compared with transmitral indexes E/A ratio. Results Significant correlations were found between the average Vs and LVCO( r=0.638,p<0.001 ),and between the average Ve/Va and transmitral indexes E/A ratio ( r=0.703,p<0.001 ) in the patients with Dual-chamber Pacing. The results were the same as those in normal subjects(r=0.662,p<0.001;r=0.728,p<0.001 ) .Conclusion Measuring the motion velocities of mitral annulars by QTVI can be used to assess global left ventricular systolic and diastolic function in Dual-chamber Pacing .