论文部分内容阅读
胎心率电子监护是对胎儿生理学连续观察的方法.胎儿在宫内的生长情况可以通过心脏的机械活动或心肌收缩产生的电力活动进行分析估价。体内环境如血液 pH、PO_2、PCO_2的改变,对胎儿的生存有影响,而这些影响可从胎心率(fetal hcart rale,FHR)记录上显示出来.FHR 是中枢神经系统调节机能的表现,因此,与其说胎心率的监护是监测胎儿心脏机能,不如说它是监测胎儿中枢神经系统的调节机能。要正确地应用胎心监护仪,临床医生首先必须对胎儿血循环的特点、母胎交换的解剖、FHR 的生理调节有基本的了解,同时也要了解宫缩对 FHR 的影响及 FHR 的变异性.一、胎儿血循环系统的特点胎儿脐带无神经分布,内有一条静脉,二条动脉,脐静脉管腔粗约6～7mm,管壁薄,位于脐带中心,有内环外纵两组平滑肌,易被动受压而影响血流:脐动
Fetal heart rate electronic monitoring of fetal physiology is a continuous observation of the method of fetal growth in the uterus can be measured by the heart’s mechanical activity or myocardial contraction generated power activity evaluation. Changes in the body’s environment, such as blood pH, PO 2, and PCO 2, have an effect on the survival of the fetus, and these effects are shown by fetal hCAR (FHR) recordings. FHR is a manifestation of the central nervous system regulatory function , Rather than monitoring fetal heart rate fetal heart function monitoring, as it is to monitor fetal central nervous system regulatory function. To correctly apply the fetal heart monitor, clinicians must first understand the characteristics of fetal blood circulation, the anatomy of the maternal-fetal exchange, and the physiological regulation of FHR, and also understand the effect of contractions on FHR and the variability of FHR. Fetal blood circulation system characteristics Fetal umbilical cord without nerve distribution, there is a vein, two arteries, umbilical vein lumen about 6 ~ 7mm, the wall thin, located in the center of the umbilical cord, inner and outer longitudinal two groups of smooth muscle, easily passive Pressure and affect the blood flow: umbilical