Abnormal fetal heart rate

Introduction The fetal heart rate is regulated by the sympathetic and parasympathetic nerves. The curve of the monitoring pattern formed by the transient fetal heart rate changes can be used to understand the fetal heart reaction during fetal movement and contractions, to predict whether the intrauterine fetus is hypoxic. Normal pregnancy is performed once a week from the 37th week of pregnancy. If there are complications or complications, you can start from the 28th to 30th week of pregnancy. Should pay attention to whether the rhythm of fetal heart sounds is slow or slow, etc., normal fetal heart sounds 120 ~ 160 beats / min, if the fetal heart sounds 160 beats / min or more or last 100 beats / min mean fetal intrauterine hypoxia, should Timely treatment.

Cause

More common in immature children, pregnant women with fever, intrauterine infection, fetal congenital heart disease, pregnant women with sympathomimetic drugs or parasympathetic block drugs (such as atropine), early fetal intrauterine hypoxia. Due to hypoxia in the fetus, it can cause abnormal fetal heart. If the pregnant woman has a fever, it may cause abnormal fetal heart; pregnant women with hyperthyroidism, rapid physical and mental rate, is also the cause of abnormal fetal heart; pregnant women take Shuchuanning, Ato Flat drugs may also cause fetal heart abnormalities. Abnormal fetal heart rate is caused by a variety of causes.

an examination

Related inspection

Fetal heart monitoring obstetric B-ultrasound developmental examination

The normal fetal heart is regular and powerful, 120-160 times per minute. If the fetal position is normal, the husband can use the simple device to listen to the left or right side of the lower abdomen of the pregnant woman. Before the fetal movement is reduced, the fetal heart rate is excessive. If it exceeds 160 beats/min, it is the signal of early hypoxia in the fetus; if the fetal movement is reduced or stopped, and the fetal heart rate is less than 120 beats/min, it is the late stage of fetal hypoxia. The position of the fetal heart should be at the doctor's designated place, but it should be noted that if the fetal heart is normal, it should be heard at intervals of 20 minutes; if the fetal heart is fast, it should be repeated when there is no fetal movement. At present, the application of fetal heart rate monitor has become more popular. When the fetal heart is protected, it is found that there is abnormal fetal heart pattern, and it is often used to indicate abnormal fetal heart. Abnormal fetal heart rate in most cases means that the fetus has hypoxia in the uterus. The more severe the abnormal fetal heart rate, the more severe the fetal hypoxia is, but not all fetal heart abnormalities are caused by hypoxia. In addition, the pregnant woman's own situation also affects fetal heart rate changes, such as pregnant women with fever, fetal heart rate often exceeds 160 beats / min, pregnant women have hyperthyroidism, her own heart rate is very fast, the fetal heart rate often exceeds 160 beats / min If pregnant women take certain drugs, such as salbutamol taken during preterm birth, or use atopine, it can cause heart rate in mothers and children to accelerate. Slow fetal heart rate may be caused by fetal hypoxia, but sometimes pregnant women take certain drugs, such as propranolol, the drug acts on the fetus through the placenta, causing the fetal heart rate to slow down. When the fetal heart rate continues to be slow, pay attention to check the possibility of congenital heart disease in the fetus. In addition, after more than 40 weeks of pregnancy, the fetal heart may sometimes be less than 120 times due to the development of the fetal nervous system. Points, therefore, in the case of fetal heart abnormalities, it is necessary to carefully analyze the situation and make correct judgments and treatments. If there is indeed fetal hypoxia, early delivery should be made.

Differential diagnosis

The diagnosis should be differentiated from the following symptoms:

1. Changes in fetal heart rate: The fetal heart rate is the curve of fetal heart rate regulated by sympathetic and parasympathetic nerves. The curve of the monitoring pattern formed by the instantaneous fetal heart rate changes can be used to understand the fetal heart rate during fetal movement and contractions. To speculate whether there is hypoxia in the intrauterine fetus. Abnormal fetal heart rate in most cases means that the fetus has hypoxia in the uterus. The more severe the abnormal fetal heart rate, the more severe the fetal hypoxia is, but not all fetal heart abnormalities are caused by hypoxia. In addition, the condition of the pregnant woman itself also affects the changes in the fetal heart, such as a fever in pregnant women.

2 sinus fetal heart rate: fetal heart rate is sinusoidal Fetal Heart Rate (SFHR), many authors believe that the emergence of SFHR indicates that the fetus has a serious danger, is a sign of fetal death. The perinatal mortality rate is as high as 50% to 75%.

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