![]() (1)Īs the name “delivery monitoring device” suggests, at that time it was mainly used during childbirth, but later it became the main method of pregnancy management from the middle of pregnancy to the time of delivery as NST, and its name also became fetal monitoring device (fetal monitor).īackground of the development of the ultra- compact mobile CTG (Fetal Monitor iCTG)Īs mentioned above, fetal monitors were developed in the 1970s, but the devices at that time were quite large and heavy (weighing more than about10kg), inevitably making them hospital-based and very expensive. As a result, the Doppler heart sound signal using the autocorrelation method is now used exclusively because it can be measured stably from the middle of pregnancy (all-weather type) and the measurement values are sufficiently reliable. However, direct induction fetal ECG can only be used at the time of delivery, maternal abdominal wall induction fetal ECG is easily affected by external electrical noise, the ECG becomes faint and it is difficult to detect the heart rate when there is a lot of amniotic fluid and fetal fat on the skin surface of the fetus in the middle of pregnancy, and the fetal heart sound signal using a heart sound microphone is easily affected by external noise. In the history of the development of cardiotocogram (CTG) for more than 50 years, detection methods of fetal heart rate by (1) direct induction fetal cardiac telegraph, (2) maternal abdominal wall induction fetal cardiac telegraph, (3) fetal heart sound signal, and (4) Doppler heart sound signal using ultrasound have been sought. ![]() Japanese Telemedicine and Telecare Association Kagawa University Seto Inland Sea Regional Research Honorary President, Ultra-compact mobile CTG using a cloud system (Fetal Monitor iCTG) ME instruments in Obstetric care – Proper usage and Trouble shooting –Fetal Heart Monitor/Tocometer (Delivery Monitoring System)
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