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检测３８例妊娠满４１周～４２周胎儿的大脑中动脉（ＭＣＡ）、脐动脉（ＵＡ）血流阻力指数ＲＩＭＣＡ和ＲＩＵＡ及其比值ＲＩＭＣＡ／ＲＩＵＡ，与同期足月妊娠组和过期妊娠组进行比较。结果：妊娠４１周组胎儿ＲＩＭＣＡ和ＲＩＵＡ与足月妊娠组相似，但ＲＩＭＣＡ／ＲＩＵＡ明显低于足月妊娠组（Ｐ＜０．０５），当ＲＩＭＣＡ／ＲＩＵＡ≤１．１０时，胎儿预后不良发生率明显上升（Ｐ＜０．０１）。提示：检测妊娠４１周～４２周间胎儿ＲＩＭＣＡ／ＲＩＵＡ，对了解胎儿宫内状况，预测围产儿预后，有临床指导意义。
The blood flow resistance index (RIMCA), RIUA (RIMCA / RIUA) and ratio of RIMCA / RIUA in 38 fetuses from 41 weeks to 42 weeks of gestation were measured and compared with those of term pregnancy group and outdated pregnancy group . Results: The Fetal RIMCA and RIUA of 41 weeks pregnant group were similar to those of term pregnancy group, but RIMCA / RIUA was significantly lower than that of term pregnancy group (P <0.05). When RIMCA / RIUA≤1.10, fetal prognosis was poor The rate was significantly increased (P <0.01). Tip: Detection of fetal 41 to 42 weeks gestation RIMCA / RIUA, fetal status to understand the fetus, prognosis of perinatal prognosis, clinical significance.