Bessie Amniotic fluid volume less than 300ml in late pregnancy is called oligohydramnios. Oligohydramnios in early and mid-pregnancy often ends in miscarriage. When there is oligohydramnios, the amniotic fluid is thick, turbid, and dark green. In the past, the incidence of oligohydramnios was thought to be approximately 0. 1%, but in recent years due to the widespread use of B-mode ultrasound, the detection rate of oligohydramnios is 0. 5% to 4%, the detection rate has increased. Oligohydramnios seriously affects the prognosis of perinatal infants and has attracted attention.
Oligohydramnios is fetus Dangerous, extremely important signal. If the pregnancy has reached full term, the membranes should be ruptured as soon as possible to induce labor. After rupture of membranes, if the amniotic fluid is low and thick, severely contaminated with meconium, and fetal distress occurs, it is estimated that labor cannot be completed within a short period of time. After fetal malformations are ruled out, cesarean section should be chosen to end labor. Cesarean section can significantly reduce perinatal mortality than vaginal delivery.
In recent years, the application of amniotic intravenous infusion to prevent and treat oligohydramnios in the second and third trimesters of pregnancy has achieved good results. One of the methods is to place a pressure measuring catheter and scalp electrodes in the amniotic cavity during delivery to monitor the fetus, and adjust the temperature to 0 at 37°C. 85% saline was poured into the amniotic cavity at a rate of 15 to 20 ml per minute, and dripped until the fetus heart rate The variant deceleration disappears, or the AFI reaches 8cm. Usually, about 250ml (100-700ml) of normal saline is needed to relieve fetal heart rate variation and deceleration. If the mutation deceleration does not disappear after infusing 800ml, it is considered a failure. Amnioinfusion can relieve umbilical cord compression, reduce fetal heart rate variation deceleration rate, meconium discharge rate and cesarean section rate, and improve neonatal survival rate. It is a safe, economical and effective method. However, multiple amniotic infusions can cause complications such as chorioamnionitis.
Treatment principles for pregnant women with low amniotic fluid
1. If oligohydramnios is found in early or mid-pregnancy, from a eugenic perspective, it is appropriate to terminate the pregnancy.
2. At 28 to 35 weeks of pregnancy, oligohydramnios was found, but no obvious fetal malformation was found on B-ultrasound. Treatment was given to improve placental circulation and intra-amniotic fluid injection to increase the amount of intrauterine amniotic fluid.
3. If oligohydramnios is found after 35 weeks of pregnancy and the amount of amniotic fluid does not increase after treatment, the pregnancy should be terminated after fetal malformation has been ruled out. The labor process should be closely observed. If there is intrauterine distress, oxygen should be given. If the vaginal delivery cannot be completed within a short period of time, the delivery will be completed by cesarean section.
