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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]
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 Doppler fetal monitor is commonly referred to simply as a Doppler or fetal Doppler. It may be classified as a form of Doppler ultrasonography (although usually not technically -graphy but rather sound-generating). Doppler fetal monitors provide information about the fetus similar to that provided by a fetal stethoscope. One advantage of the ...
A fetal stethoscope or fetoscope is an acoustic stethoscope shaped like a listening trumpet. It is placed against the abdomen of a pregnant woman to listen to the heart sounds of the fetus. [27] The fetal stethoscope is also known as a Pinard horn after French obstetrician Adolphe Pinard (1844–1934).
The fetal heartbeat is shown in orange, uterine contractions are shown in green, and the small green numbers (lower right) show the mother's heartbeat. Cardiotocography sound Schematic explanation of cardiotocography: heart rate (A) is calculated from fetal heart motion determined by ultrasound, and uterine contractions are measured by a ...
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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 ]
The head comprises nearly half of the fetus' size. The face is well formed. The eyelids close and will not reopen until about the 27th week. Tooth buds, which will form the baby teeth, appear. The limbs are long and thin. The fetus can make a fist with its fingers. Genitals appear well differentiated. Red blood cells are produced in the liver.