You are expecting more than one baby (twins or more). Your baby is coming early or seems smaller than expected. However, in certain situations, continual monitoring with CTG is advised. The midwife will listen to your baby's heart rate from time to time to check it is normal. In a normal, low-risk delivery, CTG is not usually needed. This measurement is used to show when the uterus is contracting. The other plate on the CTG measures how tense the mother's tummy (abdomen) is. This type of ultrasound is used to measure structures that are moving, making it useful for monitoring heart rate. In CTG monitoring, a special type of ultrasound, called Doppler®, is used. So, as ultrasound 'hits' different structures in the body, of different density, it sends back echoes of varying strength. Another example is that when ultrasound travels though bile in a gallbladder it will echo back strongly if it hits a solid gallstone. But, when it hits a solid valve, a lot of the ultrasound echoes back. For example, the ultrasound will travel freely through blood in a heart chamber. However, ultrasound bounces back as 'echoes' (it is reflected back) when it hits a more solid surface. Ultrasound travels freely through fluid and soft tissues. Ultrasound is a high-frequency sound that you cannot hear but it can be sent out (emitted) and detected by special machines. At this time you will not be having any contractions so the CTG will only monitor the baby's heart rate.ĬTG uses sound waves called ultrasound to detect the baby's heart rate. If you have CTG before you are in labour you may be asked to press a button on the machine every time the baby moves. It also shows how the heart rate changes with your contractions. The machine also provides a printout which shows the baby's heart rate over a certain length of time. Some mothers can find this distracting or worrying but it is possible to turn the volume down if the noise bothers you. The baby's heart rate can be heard as a beating or pulsing sound which the machine produces. The CTG belt is connected to a machine which interprets the signal coming from the plates. 
#Baby heartbeat monitor skin#
The midwife may put some jelly on the skin to help get a strong signal. In this way it is able to show when each contraction happens and an estimate of how strong it is. The other assesses the pressure on the tummy.
One of these plates measures the baby's heart rate. It has two round, flat plates about the size of a tennis ball which make contact with the skin. An elastic belt is placed around the mother's abdomen. This means that the equipment used to monitor the baby's heart is placed on the tummy (abdomen) of the mother. What happens during cardiotocography? External monitoringĬTG is most commonly carried out externally.
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