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作者通过胎儿监护仪记录分析胎儿在胎内环境恶化(缺氧或营养不良)时的异常行为在胎心率(FHR)图型上的表现。 1.正常妊娠16～20周胎心率几乎呈直线型,甚致胎动时也无变化。23～24周FHR的长期变化(long term variation,LTV)出现不规则现象,随孕周的增加,LTV振幅加大,不规则性增多。至27～30孕周左右胎动时出现一过性加速。FHR图型上出现LTV和一过性加速,表示由窦房结控制转向交感神经及迷走神经控制。显示有此等
The authors used fetal monitor records to analyze fetal abnormalities in the fetal environment (hypoxia or malnutrition) abnormal fetal heart rate (FHR) pattern on the performance. 1. Normal pregnancy 16 to 20 weeks fetal heart rate was almost linear, even when fetal movement did not change. Irregularities were observed in long term variation (FVR) of LTV between 23 and 24 weeks. With the increase of gestational age, LTV amplitude increased and irregularities increased. To 27 to 30 gestational weeks there was a transient fetal acceleration. LTV and transient acceleration appear on the FHR pattern, indicating the switch from the sinus node control to sympathetic and vagal control. Shows that there is such