System misuse (duration, angulation) and systems operating outside of intended range can produce thermal and non-thermal effects on fetal tissue, including the possibility for over-heating fetal tissue and introducing mechanical stress on the fetus due to cavitation, radiation force, and acoustic streaming. Fetal dopplers using 2-3MHz ultrasound are prescription devices designed and developed for use by licensed and trained health care professionals. In response to increasing home usage of clinical fetal doppler systems, the FDA issued a formal statement recommending against at-home use. Typically, they work from about 12 weeks. Heart rate display: some Dopplers automatically display the heart rate on a built-in LCD for others the fetal heart rate must be counted and timed by the practitioner.Ī major advantage of being able to record and share the recording is that it can be emailed to a healthcare professional to be checked if there are any concerns about whether or not it is the fetus's heart rate and whether or not is normal.The newer EchoHeart 5-MHz transvaginal probes aids in the detection of fetal heart tones (FHT) early in pregnancy (6–8 weeks) and for patients who have a retroverted uterus or throughout pregnancy for FHT detection for women who are obese. A 2-MHz probe is recommended for pregnant women who are overweight. A 3-MHz probe is recommended to detect a heart rate in early pregnancy (8–10 weeks gestation). Most practitioners can find the heart rate with either probe. Probe frequency: 2- MHz or 3- MHz probes.Waterproof probes are used for water births. Manufacturer: popular manufacturers Baby Doppler, Sonoline, Ultrasound Technologies, Newman Medical, Nicolet (purchased by Natus), Arjo-Huntleigh, and Summit Doppler (now Cooper Surgical).Types Fetal Heart Rate and Activity Monitor - Baby Dopplerĭopplers for home or hospital use differ in the following ways: Hon, Originally intended for use by health care professionals, this device is becoming popular for personal use. One disadvantage is the greater complexity and cost and the lower reliability of an electronic device. One advantage of the Doppler fetal monitor over a (purely acoustic) fetal stethoscope is the electronic audio output, which allows people other than the user to hear the heartbeat. It may be classified as a form of Doppler ultrasonography (although usually not technically -graphy but rather sound-generating).ĭoppler fetal monitors provide information about the fetus similar to that provided by a fetal stethoscope. The Doppler fetal monitor is commonly referred to simply as a Doppler or fetal Doppler. Use of this monitor is sometimes known as Doppler auscultation. Some models also display the heart rate in beats per minute (BPM). It uses the Doppler effect to provide an audible simulation of the heart beat. If you do decide to get one, never ignore your instincts if you feel something is wrong, regardless of what you hear on the device.Problems playing this file? See media help.Ī Doppler fetal monitor is a hand-held ultrasound transducer used to detect the fetal heartbeat for prenatal care. Home doppler companies aren't going anywhere anytime soon, despite the call from organisations for sales to be restricted. If you're tempted to get one, I would suggest not to bother as you will likely be worried if you can't pick anything up (knowing where the baby's heart is likely to be located is key which is one of the reasons why we palpate the abdomen first), you may not know what you are listening to, or you may be tempted to check in on the heartrate if movements are reduced, which can sometimes lead to false reassurance from a doppler. During labour, it may give us an idea of how well baby is coping with contractions. Dopplers don't really tell us much other than whether a heartbeat is present or not, and whether it's within the normal range. More Buying a Fetal heart doppler may seem like a great way to connect with your baby and it's exciting right? You might be at an early stage in your pregnancy where you can't feel movements yet which for some can be anxiety inducing, and feel that a doppler might put your mind at ease.
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