The high fetal heart rate in the first period and the low fetal heart rate in the second period are generally caused by overwork of pregnant women, intrauterine hypoxia, uterine contraction and other reasons.
1. Excessive exertion of pregnant women: If pregnant women exercise or stand for a long time, so that the body is in a state of over-exertion, may make the fetal heart transient stabilization phenomenon, there will be the phenomenon of pre-fetal heart rate is high and low at the end of the phenomenon.
2. Intrauterine hypoxia: if pregnant women with anemia, hypoglycemia, hypotension and other diseases, resulting in abnormal hypoxia of the uterus, which will cause the symptoms of high fetal heart rate in the early stage and low in the late stage.
3. uterine contraction: with the growth and development of the fetus, pregnant women’s psychological changes will occur, if the pregnant woman is in a prolonged period of time in a state of tension and anxiety, so that the uterus abnormal contraction, may lead to the symptoms of pre-fetal heart rate high and low later.
It is recommended that pregnant women should develop good habits, maintain a good state of mind and adequate nutrient content of the body, and go to the hospital in time for fetal heart monitoring.