Tei指数评估妊娠晚期正常胎儿心室功能的研究

The third trimester normal fetal cardiac function assessed by Doppler myocardial performance index (Tei Index)

目的：探讨正常胎儿左、右心室的Tei指数在评价胎儿心脏收缩和舒张功能中的作用及其影响因素.方法： 应用多普勒超声心动图测量 61例孕龄28～40周的胎儿左、右心室多普勒时间间期,获得等容收缩及舒张时间和射血时间, 计算左、右心室Tei指数,分析孕龄、心率对此指数的影响及左、右心室Tei指数的相关性.结果：妊娠晚期正常胎儿左心室平均Tei指数为 0.360±0.089 ,右心室平均Tei指数为0.351±0.097 ,两者具有相关性,但无明显差异（P＞0.05）.孕龄与左心室、右心室Tei指数不相关.胎心率与左心室、右心室Tei指数不相关.结论：Tei指数不受孕龄及胎心率的影响,可用来观察各种情况下的胎儿心功能变化.

Objective： To explore the influence factors of Tel index in assessing systolic and diastolic function of fetal heart in the third trimester . Methods ： Doppler waveforms of the left ventricular and right ventricular outflow tracts were obtained in 61 fetuses of the third-trimeser. The isovolumic contraction time and isovolumic relaxation time （ICT＋IRT） and ejection time （ET） were measured and the Tel was calculated with the formula （ICT＋IRT） /ET. Results： The mean Tel index in third trimester fetuses （28-40 weeks gestation） was ：left ventricular（0. 360±0. 089）;right ventricular （0. 351 ±0. 097）. Conclusion：Tel index is not binfluenced by pregnant age and heart rate . Tel index can be easily obtained in the fetuses without the need for precise anatomic imaging . Tel index may be useful to explore fetal myocardial funtion in different clinical situations.