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单水的来源和循环近年来,这方面研究有了较快的进展,现分妊娠前半期和后半期分别加以叙述。一、妊娠前半期通过对完整的10～22孕周胎儿及胎儿附属物包括生化和电镜为主的研究,早先认为羊水来源母体血清之渗透液之设想已逐渐被来源由胎儿血清所代替。以钠和尿素为例,羊水和母血清含量之相关系数依次为r=0.47,r=0.66。而羊水和胎儿血清含量之相关系数较羊水和母血清含量者为高,r=0.53,r=0.74。钾和氯的测定也存在着同样的相关关系。上述现象可用胎儿皮肤在妊娠前半期的特征来解释,此时,尚未角化之胎儿皮肤对上述电解质和水份自由通过,至妊娠前半期结束时,胎儿肾脏分泌尿液进入羊水,胎儿尿液中之钠含量稍低而尿素稍高。因而此时羊水中钠含量较前稍低,尿素则较前稍高。Lind 等认为胎儿体重和羊水量显著相关,根据上述现象,新观点认为在妊娠前半期,羊水量的增长
The origin and circulation of single water In recent years, research in this area has made rapid progress, is divided into the first half and second half of pregnancy were described. First, the first half of pregnancy through a complete 10 to 22 gestational weeks fetal and fetal appendages, including biochemical and electron microscopy based research, earlier that the amniotic fluid source of serum from the idea that the permeate has gradually been replaced by fetal serum. Taking sodium and urea as an example, the correlation coefficients between amniotic fluid and mother serum were r = 0.47 and r = 0.66, respectively. The correlation coefficient between amniotic fluid and fetal serum content was higher than that of amniotic fluid and serum, r = 0.53, r = 0.74. The same correlation exists between the determination of potassium and chlorine. The phenomenon can be used to explain the characteristics of fetal skin in the first half of pregnancy, at this time, not yet keratinized fetal skin on the electrolyte and water freely passed to the end of the first half of pregnancy, fetal urine secretion of urine into the amniotic fluid, fetal urine The sodium content is slightly lower while urea is slightly higher. Therefore, amniotic fluid sodium content slightly lower than the previous, urea is slightly higher than the previous. Lind, etc. that fetal weight and amniotic fluid volume was significantly related to the above phenomenon, the new view that in the first half of pregnancy, amniotic fluid volume growth