Fetal Doppler

Definition of Fetal Doppler

Fetal Doppler is an ultrasound device used to detect the heart rate and other relevant physiological parameters of the fetus. It uses the Doppler effect, a physical phenomenon in which the frequency of a wave changes when there is relative motion between the source and the observer. In obstetrics and gynecology, this device monitors the heart activity of the fetus by transmitting and receiving ultrasound waves.

Benefits of Fetal Doppler

Monitoring fetal heart rate

This is its main function. Normal fetal heart rate is generally around 110-160 beats per minute. Fetal Doppler can be used to check fetal heart rate regularly at home or in the clinic at various stages of pregnancy, especially in the third trimester, to detect abnormalities such as fetal distress in a timely manner.

Assessing fetal health

Lorem ipsum dolor sit amet consectetur adipisicing elit.In addition to heart rate, some advanced Fetal Doppler devices can also detect fetal blood flow, such as umbilical cord blood flow. The state of umbilical cord blood flow is crucial for the fetus to obtain oxygen and nutrients. Abnormal umbilical cord blood flow may indicate fetal development problems or placental dysfunction.

Determine fetal position

To a certain extent, it helps doctors or midwives determine the position of the fetus in the uterus. Although it is not as accurate as ultrasound examination, it can provide some preliminary information, especially in combination with the position of the fetal heart rate to infer the fetal position.

Application of Fetal Doppler

Prenatal examination: It is widely used in routine prenatal examinations in hospitals or clinics. Compared with traditional stethoscopes, Fetal Doppler can hear the fetal heartbeat more clearly and accurately, and is not disturbed by external environmental sounds. And it can provide visual heart rate display and recording functions, which is convenient for medical staff to record and track changes in fetal heart rate.

Home self-monitoring: There are many portable Fetal Doppler devices available for pregnant women to use at home. This allows pregnant women to monitor the condition of the fetus at any time, increasing their sense of security. However, it should be noted that although the operation of the equipment used at home is relatively simple, it also requires correct guidance, and home monitoring cannot completely replace professional prenatal examinations.

Types of Fetal Doppler

Handheld fetal monitor

small and light, easy to operate, composed of a probe and a display screen, suitable for routine fetal monitoring, and can be widely used in maternal checkups or daily monitoring.

Bedside fetal monitor

suitable for situations where long-term monitoring of the fetal status is required, such as delivery rooms, obstetric wards, etc. It usually consists of a central monitor and multiple monitoring bedside instruments, which can monitor the data of multiple pregnant women or fetuses at the same time, making it convenient for medical staff to observe and manage them in a centralized manner.

Continuous fetal heart rate monitor

suitable for situations such as high-risk pregnancy and fetal distress that require continuous fetal heart rate monitoring. It can record and analyze fetal heart rate changes for a long time and issue an alarm in time so that doctors can take corresponding measures in time.

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FAQ

Q: Does the fetal heart monitor have any effect on the baby?

A: Generally speaking, normal use will not have any effect. The acoustic radiation dose of the fetal heart monitor is far lower than the safety index requirements. However, it is not suitable to listen to it too frequently during pregnancy. If used at home, you can monitor when the baby is active, because every time you listen to the fetal heart, it will interfere with the baby's rest.

Q: When can the fetal heart monitor be used?

A: In addition to allowing mothers to clearly perceive the connection with the baby, it has a more important mission: to evaluate the intrauterine status of the fetus, to detect fetal abnormalities as early as possible and in time, and to take effective emergency treatment measures before the fetus suffers irreversible damage. How long after pregnancy can the fetal heart be heard? Generally speaking, starting from the 12th week of pregnancy, expectant mothers need to listen to the fetal heart every time they have a prenatal check-up; starting from the 36th week, fetal heart monitoring is performed once a week, generally for 20-40 minutes.

Q: How to listen to the fetal heartbeat?

A: Starting from the seventh month of pregnancy, pregnant mothers need to listen to the fetal heart every day to understand whether the fetus is developing healthily. The fetal heart position of pregnant mothers who are less than 6 months pregnant is generally just below the navel, to the left or right. Pregnant mothers who are 6 months pregnant usually listen to the fetal heart at the back of the fetus, so that the fetal heart rate will be clearer and more accurate. The fetal heartbeat is similar to the ticking sound of a clock, and the speed is relatively fast.

Q: What is the normal fetal heart rate?

A: Its normal value is generally 110 to 160 beats/minute. The average fetal heart rate before 20 weeks of pregnancy is 162 beats/minute, the average is 147 beats/minute from 21 to 30 weeks of pregnancy, and the average is 139 beats/minute from 31 to 40 weeks of pregnancy. The physiological regulation of fetal heart rate can be roughly divided into three types: external regulatory factors, internal regulatory factors, and regulatory factors that the fetus uses to maintain internal environment homeostasis.

Q: How to use the fetal heart monitor?

A: Let's introduce the correct use of the fetal heart monitor. When listening to the fetal heart, expectant mothers need to find a quiet environment where they can lie flat, slightly raise their heads, stretch their legs, and relax. After lying flat, the fetal heart position will be closer to the abdominal wall, and the distance to the fetal heart probe will be closer, so it is easier to listen to the fetal heart. Ultrasound is very easy to dissipate in the air. The role of the coupling agent is to squeeze out the air in the skin pores so that the probe is in close contact with the skin.