What does it mean that there is no baseline variation in fetal monitoring? Flat fetal heart, that is, the baseline variation decreases or disappears, which may be the damage of the central nervous system (hypoxia), or the fetal age is less than 32 weeks, and the fetus is in a sleeping state. Sedation, anesthesia, magnesium sulfate and parasympathetic nerve blockers are used.
Fetal monitoring is to check whether there is intrauterine hypoxia: Fetal heart monitoring can judge the intrauterine safety of the fetus by describing the number of fetal movements within 20 minutes, whether the fetal heart accelerates at each fetal movement, whether it is more than 15 times per minute, and whether the acceleration time lasts for more than 15 seconds. However, insufficient fetal movement and insufficient acceleration of fetal heart during fetal movement indicate that intrauterine hypoxia may exist. False positive results will appear when the fetus is asleep or for other reasons (medication, maternal disease, hypoglycemia). The score does not represent whether the fetus is healthy and smart or indicates the safety of the fetus in the uterus at this time. As long as there is a reaction, the score is greater than 8, which is normal. It depends on the deduction, if the fetal heart rate; 160 beats/min, points will be deducted, or points will be deducted if the fetal movement is unresponsive, suggesting the possibility of intrauterine hypoxia. In addition, the fetal monitor will also check for contractions.
Fetal heart monitoring is a very important examination in the third trimester, which can reflect the intrauterine safety of the fetus. If it is particularly abnormal, it is necessary to terminate the pregnancy in time and save the fetus. Unqualified fetal heart monitoring does not necessarily mean lack of oxygen, but its graphics are actually ugly. It is divided into many types, and different types of unqualified fetal hypoxia have different relationships. The most common failure in fetal heart monitoring is insufficient acceleration after fetal movement, but it is good in other aspects. Most of this does not mean that the fetus is hypoxic, so it is good to review the fetal monitoring. Another unqualified fetal heart monitoring is the variation and loss of fetal heart baseline, and the fetal heart monitoring performance is straight line. If you pull the line for more than 90 minutes, it means that there is a high possibility of fetal hypoxia.
Four types of baseline variation of fetal heart rate? The fetal heart monitoring often done in prenatal examination is NST. Fetal heart monitoring mainly depends on the baseline, baseline changes, acceleration and deceleration of fetal heart.
Baseline variation refers to the amplitude change of fetal heart rate from peak to trough per minute, which is divided into:
1. Change disappears: amplitude fluctuation disappears completely.
2. Minor change: amplitude fluctuation ≤5 times/minute.
3. Moderate variation (normal variation): The amplitude fluctuates 6-25 times/min, suggesting that the fetal placenta has good function and good reserve.
4. Significant change: amplitude fluctuation >; 25 times per minute, suggesting that acute fetal hypoxia is mostly caused by umbilical cord compression.
Fetal heart baseline is used to measure fetal heart rate. The normal fetal heart rate ranges from 120 to 160 beats per minute. If there is any change, it may be caused by lack of oxygen. You need to take oxygen under the guidance of a doctor. It is suggested that health care should be done during pregnancy, diet and nutrition should be reasonable, all kinds of examinations should be done in time, and prenatal examinations should be done regularly. If there is any abnormality, you need to see a doctor in time.
In general, before 15 weeks of pregnancy, there is no need to use ultrasonic Doppler fetal heart rate for self-monitoring. For pregnant women with 15-28 weeks, it is safe to test three times a day, each time 1 minute. For pregnant women after 28 weeks of pregnancy, the fetal differentiation is completed, which can prolong the monitoring time and times. For high-risk pregnant women after 35 weeks of pregnancy (such as pregnant women complicated with pregnancy-induced hypertension and hyperthyroidism), the fetal heart rate should be monitored continuously in the hospital, and it can be monitored for a long time if necessary (1 hour or more).