What causes fetal hypoxia in the third trimester

Fetal hypoxia occurs in the third trimester of pregnancy for many reasons, including maternal reasons and fetal placental causes, the fetus develops more in the third trimester, the oxygen demand increases, the heart load of the pregnant woman increases, and the heart function of the pregnant woman is not good.

Hypoxia of pregnant women has a great impact on the safety of mothers and babies, and must be paid attention to, the main causes of hypoxia of pregnant women are maternal factors, blood oxygen transport and exchange disorders between mothers and fetuses, fetal factors, etc., and it is hoped that pregnant women must develop good living habits, do not be careless about their own abnormal conditions, seek medical attention as soon as possible, and take effective countermeasures under the guidance of doctors.

What are the causes of fetal hypoxia in the third trimester? Pregnancy is a special physiological period for women, special attention should be paid to safety, in order to ensure the safety of the mother and baby, the incidence of fetal hypoxia is very high, especially in the third trimester of pregnancy, the probability of fetal hypoxia is greater, for the fetal hypoxia to cause enough attention, to avoid affecting the health of the fetus. Let's learn what are the causes of fetal hypoxia in the third trimester?

1. Maternal factors.

This is one of the common causes of fetal hypoxia in the third trimester of pregnancy, the oxygen required by the fetus comes from the mother's supply, and the maternal hypoxia will cause the fetus to be hypoxic. Maternal hypoxia mainly occurs in maternal acute blood loss and severe anemia, fever caused by acute infection, high-risk pregnancy, etc., and some pregnant women are due to excessive sedation or anesthetics to inhibit breathing, or excessive tension of pregnant women, resulting in vasoconstriction, placental blood supply is insufficient, which will cause hypoxia of pregnant women, resulting in insufficient oxygen supply to the fetus.

2. Disorders of blood oxygen transport and exchange between mother and fetus.

This is also one of the common causes of fetal hypoxia in the third trimester, mainly seen in placenta previa, placental abruption, post-term pregnancy or placenta is too large or too small and other conditions that cause placental hypofunction, or the fetus umbilical cord around the neck, umbilical cord knotting, umbilical cord hematoma, umbilical cord prolapse and other umbilical cord abnormalities, or abnormal uterine contraction, etc., will cause fetal hypoxia in the third trimester.

3. Fetal factors.

This situation is relatively rare, if the fetus has congenital cardiovascular disease and intracranial hemorrhage, etc., it will affect the function of the fetal cardiovascular system, resulting in insufficient blood of the fetus, resulting in fetal hypoxia, and some fetal malformations, fetal infection, or maternal and infant blood group incompatibility will cause fetal hypoxia.

What are the causes of fetal hypoxia in the third trimester? The above is an introduction to this issue, I hope it will be helpful to you. Fetal hypoxia will cause different degrees of impact on the fetus, and serious cases will affect the intellectual development of the fetus and affect the health of the fetus.

Human life activities are inseparable from oxygen, which is an indispensable condition for a person's survival, and a person needs to breathe every minute and every second. If there is a lack of oxygen, it can cause a lot of damage to the body. For the fetus, this is even more so.

The fetus is fragile, what happens if the fetus is deprived of oxygen in the late stage?

Fetal hypoxia, starting with abnormal fetal heartbeat. A normal fetal heartbeat is regular and forceful, usually about 120 160 beats per minute, and can be heard after 12 weeks of pregnancy. Before the fetal movement decreases, the fetal heart rate is more than 160 minutes, which is a signal of early fetal hypoxia; Fetal movements are reduced or stopped, and the fetal heart rate is less than 120 minutes, which is the late stage of fetal hypoxia.

Fetal hypoxia will show that the fetal heart rate increases or slows down, the normal fetal heart rate is between 120 and 160, as long as the fetal heart rate is between 120 and 160, it generally means that the fetus is not hypoxic, it is best to go to the hospital for a check-up and close observation. The position of the fetal heartbeat should be heard at the doctor's point of view, followed by changes in fetal movements. Fetal movement is a normal physiological activity of the fetus, which can be felt by pregnant women at 18 to 20 weeks of gestation.

Fetal movements vary from fetal to fetus, and in general, quiet fetal movements are softer and less frequent; Excitable fetal movements are large and frequent. Fetal hypoxia can also lead to failure to thrive. Fetal growth is also stunted after a lack of oxygen.

Fetal growth can be determined by measuring fundal height, i.e., the distance from the top of the pubic symphysis to the highest point of the fundus. Normally, after 28 weeks of pregnancy, it should increase by about 1 cm per week. Pregnant women can be measured at home or at the hospital regularly.

If it does not grow for two weeks, further testing should be done.

There are many causes of hypoxia, you need to find out the cause of hypoxia while improving hypoxia, such as anemia, high blood pressure, umbilical cord knotting around the neck and other pregnancy diseases, check the placental function, fetal hypoxia can affect the normal development of the fetus, take the left position when resting. Fetal hypoxia will show that the fetal heart rate increases or slows down, the normal fetal heart rate is between 120 and 160, as long as the fetal heart rate is between 120 and 160, it generally means that the fetus is not hypoxic, it is best to go to the hospital for a check-up and close observation. Late hypoxia can easily lead to intrauterine fetal death, it is recommended to consider it in time, try oxygen inhalation to see the effect, if necessary, to see if vitamin C can improve the situation, pay attention to regular fetal heart rate monitoring, check to see the fetal umbilical cord and amniotic fluid.

If the lack of oxygen is severe, it will have a bad effect on the baby's brain. If it is severe, the baby may not be normal, so it is best to go for oxygen, follow the doctor's advice, and if it is necessary to have a caesarean section, it is still necessary to have a caesarean section.

The harm of fetal hypoxia is very great, and if it is not dealt with in time, it will even lead to the death of the fetus, which will bring great pain to the family. So how can we detect fetal hypoxia in time? What are the manifestations of fetal hypoxia?

Let's introduce the manifestations of fetal hypoxia, and expectant mothers can come to find out!

Fetal hypoxia. Changes in fetal movements.

Every baby will have fetal movements, which can be felt by expectant mothers at 18-20 weeks of gestation. Fetal movements are different for each baby, and usually quiet fetal movements are not strong and less frequent; Excitable fetuses have a large amplitude and frequent fetal movements. If your baby is moving more violently and suddenly quiet, or if the baby who has been very quiet is suddenly restless, and the fetal movement is less than 10 times for 12 hours or more than 40 times for 12 hours, it may actually be a lack of oxygen in the fetus.

It is caused by the baby's impact on the central nervous system in order to reduce oxygen consumption or hypoxia. Expectant mothers can calculate fetal movements in a sitting or lying position, counting 1 hour each in the morning, noon and evening at a fixed time every day, and multiplying 4 times 3 times is the number of fetal movements in 12 hours.

Abnormal fetal heartbeat. Normal fetal heart rate is to follow a certain regularity, 120-160 times per minute, if the baby is normal, the fetal position is on the left or right side of the lower abdomen of the expectant mother, that is, the side of the fetal back, then the expectant father can use a stethoscope to hear the child's fetal heartbeat. Before the fetal movement decreases, there is fetal heart rate frequency, if it exceeds 160 beats, then it indicates that the child is hypoxia in the early stage; If the fetal movement decreases or stops, and the fetal heart rate is less than 120 beats, it means that the child is in the late stage of hypoxia.

Listen to the position of the fetal heart rate to follow the doctor's guidance, and at the same time understand that if the fetal heart rate is normal, it is 20 minutes apart; If the fetal heart rate is fast, it is a second hearing when there is no fetal movement.

Growth stops. The growth of the fetus is affected by a lack of oxygen. The specific growth of the fetus can be known by measuring the height of the uterine fundus (the distance from the symphysis pubis to the fundus).

In general, after 28 weeks of pregnancy, it should be increased by about 1 cm per week. Expectant mothers can measure on their own. If it does not grow for 2 weeks, then you should go to the hospital for a checkup.

What are the manifestations of fetal hypoxia? The harm of fetal hypoxia is very large, when the fetus is hypoxic, it will send out some distress signals, the above we have introduced the symptoms of fetal hypoxia, the above situation, our expectant mothers must pay attention!

Fetal intrauterine hypoxia may lead to fetal growth retardation, that is, fetal intrauterine growth restriction, and severe fetal intrauterine hypoxia may also lead to fetal death in utero or fetal intrauterine distress. Fetal intrauterine hypoxia is mainly related to insufficient oxygen content in maternal blood, impaired blood oxygen transport or exchange between mother and fetus, and abnormal fetal factors. Fetal intrauterine hypoxia is divided into acute hypoxia and chronic hypoxia, and acute hypoxia is often caused by blood circulation disorders in the uterus and placenta, obstruction of gas exchange or disorders of blood circulation in the umbilical cord.

For example, placenta previa, placental abruption, excessive contractions or excessive twisting of the umbilical cord, true umbilical cord knot, or umbilical cord prolapse. Chronic fetal hypoxia is often related to insufficient blood oxygen content of the fetus and vascular lesions of the uterus and placenta. ”