What Is Umbilical Blood Flow?
Umbilical blood flow refers to the ratio of the highest blood flow velocity in the systole of the umbilical artery to the lowest blood flow velocity in the stretch, the index of Yin force and the pulsation index to reflect the blood flow. Umbilical blood flow is examined to determine how the fetus is developing in the uterus.
Umbilical blood flow
- Chinese name
- Umbilical blood flow
- Application area
- medicine
- Instrument
- Umbilical artery blood flow detector
- Object
- Pregnant women
- Umbilical blood flow refers to the ratio of the highest blood flow velocity in the systole of the umbilical artery to the lowest blood flow velocity in the stretch, the index of Yin force and the pulsation index to reflect the blood flow. Umbilical blood flow is examined to determine how the fetus is developing in the uterus.
- Umbilical blood flow is checked to determine the fetal development in the uterus, such as the presence of
- Table 1 Normal group and
- Umbilical artery blood flow detector is used to detect umbilical artery blood flow on the side of the fetus. The built-in software will automatically measure the impedance of the bleeding flow according to the measured S / D, PI, RI, and FUR blood flow indicators.
- These are indicators of umbilical arterial blood flow impedance, which shows the circulation between the fetus and the placenta.
- RI: umbilical artery blood flow resistance index
- S / D: Umbilical artery blood flow velocity peak-to-valley ratio
- During normal pregnancy, the S / D and RI values of the fetus show a decreasing trend with the passage of pregnancy. In particular, the change in the S / D value is an important indicator of whether the fetal development is normal.
- The first stage: If the S / D and RI values increase from 26 to 28 weeks of pregnancy (S / D should be less than 3 and RI should be less than 0.8 after 28 weeks), the main considerations are:
- (1) Fetal malformation: Fetal congenital diseases are closely related to umbilical artery resistance, and further ultrasound examination should be performed.
- (2) Umbilical cord abnormality: When the umbilical cord is twisted, too long or too short, or too thin to affect the placental circulation, the abnormality is the blood flow impedance index. If the S / D value is higher than normal and the B-ultrasound shows abnormalities such as the umbilical cord around the neck, it should be closely observed according to the stages of pregnancy.
- (3) Placental dysfunction: Pathological changes of the placenta can lead to a reduction in placental volume, a decrease in the effective cross-sectional area of the blood vessels, an increase in blood flow resistance, and a decrease in blood perfusion volume.
- (4) Intrauterine growth retardation (IUGR): There are many reasons for the occurrence of IUGR in pregnant women. In addition to genetic nutrition, harmful contact, deformity, virus and other factors, the proportion of IUGR due to pregnancy attachments such as placenta is increasing , Showing that the S / D and RI values increase.
- The second stage: 36 to 37 weeks later, the umbilical artery blood flow impedance was divided into three levels.
- Grade 1: S / D value <3.0, umbilical artery blood flow impedance is at a normal level.
- Level 2: S / D value> 3.0, but <4.0, will not cause acute fetal distress, and should be treated in time to prevent the disease from worsening.
- Grade 3: S / D value> 4.0, will lead to poor prognosis of perinatal infants.
- The third stage: umbilical artery impedance index during delivery:
- In normal pregnancy, the S / D value does not change significantly. If the index is abnormal, it indicates that the perinatal prognosis is poor.
- If an abnormal umbilical blood flow is diagnosed, it is a good idea to count fetal movements every day to monitor the condition of the fetus. If the umbilical blood flow abnormality is not very serious, it is recommended to take the left lying position. If there is no improvement, oxygen inhalation treatment is needed if necessary.