How does pregnant woman oligohydramnios return a responsibility?

summary

When the volume of amniotic fluid is less than 300 ml, it is called oligohydramnios, which is a traditional concept. However, it is difficult to accurately estimate the total amount of amniotic fluid whether vaginal delivery or cesarean section. In recent years, due to the application of imaging, especially the application of obstetric B-ultrasound technology, the diagnosis of oligohydramnios is more accurate and the diagnostic standard is unified, which has been gradually used in clinical practice. The criteria of B-ultrasound diagnosis of oligohydramnios are amniotic fluid index (AFI) < 5cm or maximum amniotic pool depth < 2cm. Let's share my experience with you.

How does pregnant woman oligohydramnios return a responsibility?

Fetal malformations many congenital malformations, especially urinary system malformations, are associated with oligohydramnios, such as congenital absence of kidney, renal dysplasia, polycystic kidney and urethral stricture or atresia. The above deformities lead to the reduction or inability of urine production, the resulting urine can not be excreted or excreted, anuria or oliguria, resulting in the decline of amniotic fluid production, normal amniotic fluid absorption, and finally oligohydramnios.

Placental dysfunction placenta is the organ of material exchange between fetus and mother. Decreased placental function can lead to decreased fetal blood volume, decreased fetal renal blood supply, and finally reduced fetal urine production. Placental function is determined by placental blood supply, maternal fetal barrier and effective working area. The decrease of placental function usually includes the decrease of placental blood supply, the decrease of permeability of placental maternal fetal barrier and the decrease of effective area of placenta.

The decrease of placental blood supply theoretically includes the decrease of blood volume of pregnant women, the decrease of blood pressure of pregnant women and the abnormality of placental blood supply vessels. However, it is generally believed that the decrease of blood volume of pregnant women is the main reason for the decrease of placental blood supply.

matters needing attention

For women of childbearing age, we should strengthen the propaganda and guidance of eugenics and eugenics, do a good job in prenatal screening, establish a card at the third month of pregnancy, and conduct regular and systematic health examination; Planned delivery after 37 weeks to before 40 weeks reduces the incidence of oligohydramnios. At present, the main drugs that can affect the amount of amniotic fluid are indomethacin, which can reduce the amount of amniotic fluid for the treatment of excessive amniotic fluid. When using it, we should pay attention to detect the amount of amniotic fluid, reduce or stop the drug in time, so as to avoid causing oligohydramnios. This drug should not be used after 34 weeks of pregnancy, because it can cause premature closure of fetal ductus arteriosus.