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妊娠早期,子宫增大不明显,体位对胎儿的影响不大。妊娠5个月以后,子宫的重量、容积显著增大,子宫与周围脏器、血管的毗邻关系也发生了变化,特别是妊娠7个月以后,由于孕妇自身体重和胎儿体重的增加,这时期的体位可直接影响子宫的血液流量,不仅关系到孕妇的健康,而且对胎儿的安危也有着至关重要的影响。仰卧体位尤其会对孕妇及胎儿产生一系列的不利影响。仰卧时,增大的子宫压迫腹动脉,使子宫动脉的血流量降低而影响子宫供血,从而使胎盘的供血减少。子宫血流量不足,使缺血的胎盘释放出大量的肾素,肾素进入母体血液循环,可导致动脉压增高,易发
Early pregnancy, uterine enlargement is not obvious, little effect on the fetus. 5 months after pregnancy, uterine weight and volume increased significantly, the uterus and the surrounding organs, blood vessels have also changed the adjacent relationship has also changed, especially after 7 months of pregnancy, due to pregnant women, their own weight and fetal weight gain, this period Of the body position can directly affect the uterine blood flow, not only related to the health of pregnant women, but also the fetus’s safety also has a crucial impact. Supine position especially pregnant women and fetuses will have a series of adverse effects. Supine, the enlarged uterus abdominal artery compression, uterine artery blood flow decreased and affect the uterine blood supply, so that the placenta to reduce blood supply. Inadequate uterine blood flow, the release of a large number of ischemic placenta renin, renin into the maternal blood circulation, can lead to increased arterial pressure, easy to send