Dopplerometry in pregnancy - transcript

Dopplerometry utero-placental blood flow refers to those studies that are conducted to diagnose circulatory disorders in the uterus, fetal vessels, umbilical cord. A method based on the Doppler effect is based on a change in the frequency of oscillations of a wave reflected from moving bodies. The screen captures the graph, which is deciphered by the computer program.

How is dopplerometry performed?

Any special preparation before the procedure, the pregnant is not required. It is carried out in prone position. Dopplerometry itself does not differ from usual ultrasound and is absolutely painless. The duration of the manipulation is 30 minutes.

What indicators allows you to install dopplerometry?

To determine the state of blood flow, the following indicators of doplerometry are determined, which normally have corresponding values:

1. Systolic-diastolic ratio (SDO) - this indicator is calculated by dividing the systolic rate by diastolic.
2. The resistance index (IR) is calculated by dividing the difference between the systolic and diastolic velocity by the maximum rate.
3. The pulsating index (PI) is obtained if the difference between the maximum and minimum speeds is divided by the average blood flow velocity.

How is the decoding of the dopplerometry performed?

The interpretation of the dopplerometry performed during pregnancy is performed exclusively by the doctor. Despite the fact that there are certain norms, it is necessary to take into account the individuality of each organism, as well as its state at the moment.

The decoding of the fetal dopplerometry is performed according to the following indices:

1. IR of the umbilical arteries:

• from 20 to 23 week - 0,62-0,82;
• 24-29 weeks - 0.58-0.78;
• 30-33 weeks - 0.521-0.75;
• 34-37 weeks: 0.482 to 0.71;
• 38-40 weeks: 0.42-068.

• From 16 to 19 week - 4,55-4,67;
• 20-22 weeks - 3.87-3.95;
• 23-25 ​​weeks, 3.41-3.61;
• 26-28 weeks - 3,191-3.27;
• 29-31 weeks - 2.88-2.94;
• 32-34 weeks - 2.48-2.52;
• 35-37 weeks - 2.4-2.45;
• 38-41 weeks - 2,19-2,22.

The given values ​​of the indicators of the norm of doplerometry change weekly, as shown above.

After the results, the doctor evaluates the condition of the placental blood flow, and makes a decision on the need for therapy, if the indicators do not correspond to the norm.