目的：研究正常新生儿脑循环的血流动力学参数。方法：应用导纳式双侧脑血流自动检测仪检测40例正常新生儿,探讨其脑血流变化的规律性。结果：正常新生儿脑导纳图各项指标左右两侧差异均无显著性(P>0.05),性别和分娩方式对新生儿脑导纳图各指标影响差异无显著性(P>0.05),日龄第1天与第3天及第4天新生儿脑导纳微分环(ADL)I+II指数差异有显著性(P<0.05),不同体重组新生儿ADLI+II指数及流入容积速度(Hs/b-S)差异有显著性(P<0.05)。结论：提出了正常新生儿脑导纳图检测的参考值范围,并观察到日龄和体重是其主要影响因素。

OBJECTIVE: Cerebral electrical admittance plethysmography is a novel noninvasive technique for evaluating cerebral hemodynamics. This study aimed to measure the reference values of cerebral electrical admittance plethysmogram in healthy newborns. METHODS: Bilateral cerebral electrical admittance plethysmography was performed in 40 healthy newborns. RESULTS: The values of various indexes of cerebral electrical admittance plethysmogram in 40 newborns were obtained by this technique. The index of Admittance Differential Loop (ADL) I+II at the third and fourth days after birth was significantly higher than that at the first day of life (P<0.05). There were significant differences in the index of ADL I+II and the ratio of Hs to b-S (Hs/ b-S) among different birth weight groups (P<0.05). No significant differences were found in all the indexes of cerebral electrical admittance plethysmogram between the left and right brain of newborns. Gender and parturition mode had also no effects on these indexes. CONCLUSIONS: The research reported the reference values of cerebral electrical admittance plethysmogram in healthy newborns. The postnatal age and birth weight are influencing factors for the cerebral electrical admittance plethysmogram.