Fetal heart monitoring is a general term for fetal heart rate. It is a mode of recording fetal heart rate graph and contraction pressure wave graph by using fetal heart electronic device ECG monitor for clinical medical analysis, which can grasp the reflection of fetal heart rate during fetal movement and contraction and infer whether the baby in intrauterine tube is hypoxic. It is a specific test method, which can correctly evaluate the intrauterine situation of infants. Generally, fetal heart monitoring is done gradually in 32-36 weeks. If there is a history of abortion or failure of fetal heart monitoring, it will be advanced to 28 weeks. The general doctor will ask you to set the time for fetal heart monitoring according to your situation. Time depends on your personal situation.
There are two main ways to monitor fetal heart rate. The first one is fetal heart rate. Under normal conditions, fetal heart rate fluctuates between 1 10- 160 beats/min. After fetal movement, the fetal heart rate can be temporarily increased, higher than 160 beats/min, but it doesn't take long to recover, which is also the main performance of the baby's excellent health. If the fetal heart beats more than 160 times per minute, or less than 1 10 times, or the heart rate is irregular, jumping fast and slow, and there is a gap in the middle, it is abnormal. The bottom one shows that the working pressure in the uterine cavity will only increase when the uterus contracts, and then it will remain at around 20mmHg. The comprehensive score of fetal heart monitoring is above 8 points, which is regarded as reaching the standard. If the score is 6-7, it may be a problem of insufficient oxygen. Need to complete a fetal heart monitoring, comprehensive query results.
There are three main parameters: baseline rate, gene variation and regular change.
1. Baseline rate: refers to the fetal heart rate without fetal movement and contraction, lasting above 10min, which is different from the traditional stethoscope. Fetal distress can be diagnosed by stethoscope fetal heart rate ≥ 160 and ≤ 1 10 times/time-sharing chart. However, the fetal heart rate recorded by fetal heart monitoring for a period of time, although ≥ 160 beats/min, is tachycardia due to various influencing factors. The chart of heartbeat ≤ 1 10 beats/hour indicates bradycardia. Also pay special attention to whether sedatives and anesthetics are used and whether the position of fetal head is stressed in the basin. Naturally, we should attach great importance to the speed of heart rate, and pay more attention to the changes of heart rate, such as the slow increase or gradual decrease of baseline rate, which is an obvious change of intrauterine precursors of hypoxia, metabolic acidosis or fetal death.
2. Gene variability refers to the regular dynamic response of two independent central nervous systems to heartbeat regulation. Only when their functions are normal, they mainly show ups and downs within a certain intensity. It is emphasized that short gene variation may be absent during intrauterine ischemia and hypoxia, but with the increase of baseline rate, the variation of simple baseline gene decreases. The false positive rate of vertical or excessive elevation in predicting intrauterine hypoxia is high, and other main parameters need to be observed.
3. Regular change: refers to whether NST accelerates with fetal movement. The commonly used concept of reflex NST is: the fetal movement accelerated by fetal heart rate is at least ≥3 times within 20 minutes, the intensity is ≥15s, and the time is ≥15s. If the above accelerated reaction does not occur within 40 minutes, it is non-reflective.
In addition to going to the hospital once a week for fetal heart monitoring, other time ranges must also be in the number of fetal movements, and there must be more than three fetal movements per hour. If the child doesn't take the initiative, it will last for hours. For example, if it lasts for 12 hour, the number of fetal movements is less than 20, which needs attention. Some people who are too tired to count fetal movements can have fetal heart monitoring at home and enjoy the services of doctors and experts at home.