Nageotte, Fetal Heart Rate Monitoring Third Edition, 2003, p. Auscultation - the use of a similar device to study a patient's own blood system.The company was acquired by Oxford Instruments in 1987 to form Oxford Sonicaid. Sonicaid products included the D205/206 portable fetal Dopplers and FM2/3/4 series of fetal monitors. The use of the word Sonicaid for Doppler fetal monitors comes from the products of the UK company Sonicaid Ltd. 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.
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