Left Ventricular Systolic Function and Synchronicity After Pacemaker Implantation on Different Locations by Two-dimensional Speckle Tracking Imaging and Real-time Three -dimensional Echocardiography / 中国医学影像学杂志

ABSTRACT

Purpose To evaluate left ventricular systolic function and synchronicity after pacemaker implantation on different locations of right ventricle by two-dimensional speckle tracking imaging (2D-STI) and real-time three-dimensional echocardiography (RT-3DE) and to explore the correlation of the two techniques.Materials and Methods Twenty-seven patients who received permanent cardiac dual-cavity pacemaker implantation in the Second Affiliated Hospital of Chongqing Medical University from September 2016 to May 2017 were enrolled and divided into right ventricle apex (RVA) pacing group and right ventricle outflow tract (ROVT) pacing group in line with different implantation parts.2D-STI and RT-3DE were taken to obtain left ventricular ejection fraction (LVEF),longitudinal strain and synchronic parameters of the patients one month before and after the surgery.Meanwhile for synchronic parameters,correlation analysis of percentage (Tmsv-16-SD％) of standard deviation (Tp-SD) of time when the 18th section of the left ventricle reached peak and the standard deviation of volume when the 16th section of the left ventricle reachd minimum end-systole in cardiac cycle would be developed.Results Postoperative LVEF in two groups was obviously decreased compared with that before the surgery (P＜0.05).Postoperative longitudinal systolic peak of the left ventricle apex section in RVA group was significantly increased compared with that before the surgery (P＜0.05).Left ventricular systolic synchronic parameters in the two groups were obviously enhanced compared with those before surgery (P＜0.05),among which enhancement in RVA group was more obvious than that in ROVT group.Difference of Tp-SD,maximum difference of time of the 18th section of the left ventricle reaching peak and time of the 16th section of the left ventricle reaching minimum systolic volume and percentage of maximum difference of minimum systolic volume time of the 16th section of the left ventricle in cardiac cycle was statistically significant (P＜0.05).Tp-SD was positively correlate with Tmsv-16-SD％ (r=0.775,P＜0.001).Conclusion Postoperative systolic functions of left ventricle in the two groups are decreased compared with those before the surgery.Left ventricular systolic dyssynchrony after the surgery is caused in RVA group and RVOT group,but left ventricular systolic dyssynchrony in RVOT group is better than that in RVA group.2D-STI and RT-3DE can be used for quantitative analysis of left ventricular systolic synchronicity with good correlation.