Absence of fetal heart sounds (absence of fetal heart sounds)

Introduction The fetus itself has abnormalities. If it develops for a certain period of time, it will not continue to grow, and there will be a phenomenon of fetal death. It is very necessary to perform regular fetal heart sound monitoring every month during pregnancy, so that problems can be detected early and solved in time. If the fetal heart rate is found to be too slow, pregnant women should go to the hospital for examination so that the baby is not in a dangerous situation and cannot be dealt with in time. If there is no dangerous situation such as umbilical cord around the neck, but the pregnant woman is weak and the environment is hypoxia, the doctor may let the pregnant woman carry out oxygen therapy for a period of time, and increase the nutrition intake to increase the vitality of the fetus.

Cause

Generally, there are several reasons: First, the fetus itself has abnormalities. If it develops for a certain period of time, it will not continue to grow, and there will be a phenomenon of fetal death. Second, the pregnant womans own body is weak or the hormone secretion is low, and the growth of the fetus is not maintained. Level, so that the fetus collapses in the abdomen; Third, the pregnant woman's body posture is not right or stay in the place where ventilation and ventilation are not good for a long time, causing the fetus to have hypoxia in the palace, and the heartbeat is slowed down due to suffocation; another reason is that the pregnant woman and the fetus are Normal, but when the fetus is active in the amniotic fluid, the umbilical cord around the neck causes suffocation.

an examination

Related inspection

Obstetric B super fetal heartbeat fetal heart sound

It is very necessary to perform regular fetal heart sound monitoring every month during pregnancy, so that problems can be detected early and solved in time. If the fetal heart rate is found to be too slow, pregnant women should go to the hospital for examination so that the baby is not in a dangerous situation and cannot be dealt with in time. If there is no dangerous situation such as umbilical cord around the neck, but the pregnant woman is weak and the environment is hypoxia, the doctor may let the pregnant woman carry out oxygen therapy for a period of time, and increase the nutrition intake to increase the vitality of the fetus. But whether oxygen therapy has side effects on the fetus, there is no scientific conclusion yet, so pregnant women should not do oxygen therapy themselves, and must be carried out when necessary and under the guidance of a doctor.

If the pregnant woman consciously weakens or disappears the fetal heart, it is best for the pregnant woman to have the doctor immediately perform fetal heart examination and B-ultrasound examination to see if the fetal growth is abnormal, to find out whether there is fetal intrauterine distress or fetal death. The disappearance of heart sounds may mean dangerous situations, so pregnant women must pay attention to them. If the fetal heart rate has been normal in the early stage, the fetal development is also in line with the normal standard. Suddenly, the fetal heart rate is slowed and weakened. Generally, the fetal heart is first accelerated, and the fetal movement becomes a violent precursor. Usually, the fetus has an intrauterine distress. Struggling, then breathing weakened. In any case, in this case, pregnant women should go to the hospital immediately to avoid delays. Pregnant women should learn some fetal monitoring knowledge, usually take care of the fetus, so that you can know how to do it when you encounter an abnormality.

Differential diagnosis

It needs to be distinguished from the following symptoms:

Heart sounds and pulse disappearance: heart sound and pulse disappearance are manifestations of ventricular fibrillation: pulse can not be touched, heart sound disappears, blood pressure (systolic blood pressure) is often below 60 mm Hg? or signs of deterioration of blood circulation are not detected.

Fetal heart sound: The patient takes the supine position, and the patient is auscultated in the apical area. If the first heart sound loses its inherently low blunt tone, it is similar to the second heart sound, and both heart rate tachycardia occur continuously, like The "tick" sound of the pendulum is called the pendulum law. If accompanied by tachycardia, when the heart rate is more than 120 beats per minute, it is called fetal heart rhythm.

A weak heart sound: a sound produced by vibrations caused by myocardial contraction, heart valve closure, and blood damaging the ventricular wall, aortic wall, and the like. It can be heard with a stethoscope on a certain part of the chest wall, and the mechanical vibration of the heart sound can also be recorded by an instrument such as a transducer, which is called a heart sound map.

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