ABSTRACT
Objective To assess the left ventricular systolic function (LVSF) in patients with implanted dual-chamber(DDD) mode cardiac pacemakers using Two-dimensional Echocardiography (2DE),Real-time Tri-plane Echocardiography (RT-3PE)and Full-volume Three Dimensional Echocardiography (FV-3DE).Methods A total of 30 patients with DDD mode cardiac pacemaker were ex-amined by 2DE, RT-3PE and FV-3DE separately.Left ventricle end diastolic volume (LVEDV), left ventricle end systolic volume (LVESV), and ejection fraction (EF) were measured and compared within the three methods above .Results The measurement of EF with patients of post-operation was higher than the patients of pre-operation.The measurements of EF with 2DE were higher than RT-3PE.The measurements of LVEDV , LVESV and SV with 2DE and RT-3PE were lower than FV-3DE, and EF was higher .There were statistically significant differences in above measurements ( P 0.05).Conclusions Implanting DDD mode cardiac pace-maker can evaluate LVSF of patients obviously .FV-3DE can evaluate LVSF in patients with DDD mode cardiac pacemaker accurately . The LVEDV, LVESV and SV are underestimated by 2DE and RT-3PE, and EF is overestimated by 2DE and RT-3PE.
ABSTRACT
Objective To evaluate the left ventricular systolic dyssynchrony in patients with left ventricular apical ballooning syndrome (LVABS) quantitatively by real-time three-dimensional echocardiography(RT-3DE) and its correlation with left ventricular ejection fraction(LVEF).Methods 7patients with LVABS were enrolled in this study.The images of left ventricle in full volume mode were obtained by RT-3DE in the different time (just after admission,4 weeks and 8 weeks).Post-processing software of 4D LV Volume Tom-Tec was used for calculation of EF and 16-segmental time-volume curves was obtained.The time to the point with minimal systolic volume(Tmsv) of each segment was calculated and by which the following indexes of systolic dyssynchrony were derived:Tmsv16-SD/Dif,Tmsv-basalSD/Dif,Tmsv-mid-SD/Dif and Tmsv-apical-SD/Dif.The correlation between systolic dyssynchrony index (SDI) and LVEF was analysed.Results ① The Tmsv16-SD/Dif,Tmsv-basal-SD/Dif,Tmsv-mid-SD/Dif and Tmsv apical-SD/Dif of left ventricle in the patients of 4 weeks and 8 weeks were smaller than those of the patients just after admission.There were significant differences among them(all P ＜0.05).②The more SDI increased,the more LVEF decreased,and vice versa.SDI was negatively associated with LVEF in the different time of admission (just after admission:r =-0.758; 4 weeks:r =-0.831 ; 8 weeks:r =-0.889;all P ＜0.05).Conclusions Left ventricular systolic dyssynchrony of severe degree is observed in patients with LVABS just after admission.But the condition of dyssynchrony has been improved gradually after 4 weeks and 8 weeks.SDI is negatively correlated with LVEF.