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A 2-MHz probe is recommended for pregnant women who are overweight. 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.
Funic souffle (also known as funicular or fetal souffle), is a blowing sound heard in synch with fetal heart sounds, and may originate from the umbilical cord. It has also been described as a sharp, whistling sound that is synchronous with the pulse of the foetus, usually heard during the second trimester of pregnancy (13–28 weeks). [3]
A fetal heartbeat can be detected at around 17 to 20 weeks of gestation when the chambers of the heart have become sufficiently developed. [ 20 ] During childbirth , the parameter is part of cardiotocography , which is where the fetal heartbeat and uterine contractions are continuously recorded.
The sex of the fetus may be discerned by ultrasound as early as 11 weeks' gestation. The accuracy is relatively imprecise when attempted early. [15] [16] [17] After 13 weeks' gestation, a high accuracy of between 99% and 100% is possible if the fetus does not display intersex external characteristics. [18]
OPINION: Stacey Abrams caused a stir after making the assertion, but the medical community has long debated the merits of claiming that a heartbeat can be heard at six weeks. This hasn't stopped ...
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A Doppler device detects a heart tone further away from the location of origin. A Pinard horn must be pressed to a location very close to the fetal heart in order to detect it, providing a more accurate indication of fetal position. A doctor, nurse, or midwife can also use palpation and auscultation to determine fetal position. [4]
US: Fetal breathing movements At least one episode of > 30s or >20s [3] in 30 minutes None or less than 30s or 20s [3] US: Fetal activity / gross body movements At least three discrete body/limb movement in 30 minutes (episodes of active continuous movement considered a single movement. Less than three or two [3] movements US: Fetal muscle tone
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