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目的探讨妊娠(28~41+6周)正常胎儿左、右心室Tei指数的参考范围。方法通过多普勒超声心动图精确测量480例妊娠28~41+6周胎儿左、右心室的射血时间(ET)、等容收缩时间(TCT)、等容舒张时间(IRT),计算左、右心室Tei指数,并分析与孕周的相关性。结果中晚期妊娠正常胎儿左、右心室平均Tei指数分别为0.428±0.186,0.415±0.165,其差异无统计学意义(P>0.05);不同孕周之间Tei指数差异无统计学意义(P>0.05),说明胎儿Tei指数不随孕周变化。结论晚期妊娠正常胎儿Tei指数不受孕龄的影响,因此可用于观察胎儿整体心功能变化。
Objective To investigate the reference range of Tei index of left and right ventricles of normal fetuses during pregnancy (28 ~ 41 + 6 weeks). Methods By means of Doppler echocardiography, the left ventricle and the right ventricle of 480 fetuses from 28 to 41 + 6 weeks of gestation were measured accurately. The left ventricular ejection time, the isokinetic time (TCT) and the isovolumic relaxation time (IRT) , Tei index of right ventricle, and analyze the correlation with gestational age. Results The average Tei index of left and right ventricles of normal fetuses in late pregnancy was 0.428 ± 0.186 and 0.415 ± 0.165 respectively, with no significant difference (P> 0.05). There was no significant difference in Tei index between different gestational weeks (P> 0.05), indicating that fetal Tei index does not change with gestational age. Conclusion The normal fetus Tei index in late pregnancy is not affected by gestational age, so it can be used to observe the changes of fetal global cardiac function.