Use one before the third trimester, and you'll likely be met with silence, the sound of air moving through your GI tract, or the whoosh of blood flowing through your own arteries instead of a. There is no evidence that an ”admission trace”, or being monitored for a while at the beginning of labour is beneficial to the outcome for normal women.Įnkin et al 2000 ‘A guide to effective care in pregnancy and childbirth.’ Third addition, Oxford University Press A true heartbeat doesn't develop until roughly weeks 17 to 20 of pregnancy, when the heart chambers have developed enough to appear on an ultrasound. Intermittent auscultation should be used throughout normal labours wherever that may be (NICE 2007). The embryonic heart-rate peaks at 8 weeks gestation between 144 and 159 BPM, and after 9 weeks the rate plateaus at 137 to 144 BPM. The normal rate is 110 to 160 beats per minute, although it can be higher in the first trimester or during periods of fetal activity. Partners and other birth supporters will focus on the machine and not the woman. Continuous electronic fetal monitoring should therefore be restricted to births that are considered ‘high risk’ or after complications have developed in labour. The doctor uses a Doppler ultrasound to gauge the fetal heart rate (the number of times the baby’s heart beats per minute) and makes sure it falls within the correct range. The device picks up your baby’s heartbeat and displays the readout on a screen. Your provider will squeeze gel onto your abdomen and place the probe in the gel. Providers often use handheld Doppler devices during prenatal visits.
This can inhibit labour and lead to further interventions causing a snowball effect leading to caesarean section. Handheld Doppler ultrasound: Doppler ultrasound uses sound waves to measure your baby’s heart rate. Women who are strapped to monitors have their movements restricted preventing them adopt natural upright positions. It also showed however, that continuous electronic fetal monitoring increased the caesarean section rate and post natal complications for women (Enkin et al 2000). The reflected sound can be used to diagnose restricted blood flow, blood clots, and fetal health. Several randomised controlled trials have since been done comparing continuous electronic fetal monitoring with intermittent auscultation. The results showed that a baby dying in labour could be prevented equally effectively by both intermittent auscultation and continuous electronic fetal monitoring. Updated on MaDoppler ultrasound gives doctors a visual or audible representation of blood movement through veins, arteries and blood vessels with sound waves. The continuous use of these monitors throughout labour became widespread despite no research to justify this. It was thought that it would identify which babies were at risk of hypoxia during labour and therefore save the lives of those babies.
During the 1970’s electronic monitoring was introduced with the cardiotocograph (CTG) or fetal monitor machine.
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