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目的采用超声速度向量成像技术(VVI)评价左房功能,探讨其可行性及临床应用价值。方法健康志愿者58例,应用Simpson法计算左心房被动射血分数(LAPEF)主动射血分数(LAAEF)和左房总排空分数(LATEF),采用VVI检测左心房长轴整体收缩期峰值应变(Ss)及峰值应变率(SRs),左心房长轴整体舒张早期峰值应变(Se)及峰值应变率(SRe)和左心房长轴整体舒张晚期峰值应变(Sa)及峰值应变率(SRa),并与左房容积参数进行比较。结果左心房长轴整体收缩期峰值应变及峰值应变率与左房总排空分数相关,(r=0.398,P=0.005;r=0.365,P=0.007)。左心房长轴整体舒张早期峰值应变及峰值应变率与左房被动射血分数显著相关(r=0.475,P<0.001;r=0.505,P<0.001)。左心房长轴整体舒张晚期峰值应变及峰值应变率与左心房主动射血分数不相关(r=0.199,P=0.165;r=0.267,P=0.062)。结论速度向量成像技术对左房功能的评价具有可行性。
Objective To evaluate left atrium function by using ultrasonic velocity vector imaging (VVI) and to explore its feasibility and clinical value. Methods Fifty-eight healthy volunteers were enrolled in this study. The LAAEF and LATEF were calculated by Simpson’s method. Peak systolic strain (Ss) and peak strain rate (SRs), early peak strain (Se) and peak strain rate (SRe) and peak sag and peak strain rate (SRa) , And compared with left atrium volume parameters. Results The peak systolic strain and peak strain rate of left atrial major axis were related to left atrium total emptying score (r = 0.398, P = 0.005; r = 0.365, P = 0.007). The longitudinal peak strain and peak strain rate of the left atrial major axis were significantly correlated with left atrium passive ejection fraction (r = 0.475, P <0.001; r = 0.505, P <0.001). The longitudinal peak strain and peak strain rate of the left atrium in the long axis of the left atrium were not correlated with the left atrium aortic ejection fraction (r = 0.199, P = 0.165; r = 0.267, P = 0.062). Conclusion The speed vector imaging technique is feasible for the evaluation of left atrial function.