What causes no fetal heart rate?

There are various abnormalities in the fetal heart rate, the most common of which are bradycardia and tachycardia. If the fetal heart rate is lower than 120 beats per minute, it can be determined as bradycardia, and if the fetal heart rate is higher than 160 beats per minute, it can be called tachycardia. In addition, some fetuses have no fetal heart rate. At this time, we must first consider whether the detection is correct, such as checking whether the monitoring position is found correctly. So what is the reason for the absence of fetal heart rate?

What causes no fetal heart rate?

Under normal circumstances, the fetal heartbeat can be heard using a Doppler at 12 weeks of pregnancy. But what are the reasons why the fetal heartbeat stops after 12 weeks of pregnancy?

The most common cause of absent fetal heart rate is fetal hypoxia. Probably more than 50% of fetal heart arrest is caused by fetal hypoxia. The main cause of fetal heart arrest in the early and middle stages of pregnancy is fetal malformation.

Causes of fetal hypoxia include:

1. Umbilical cord lesions: umbilical cord torsion, umbilical cord prolapse, umbilical cord wrapped around the neck multiple times, etc.

2. Fetal factors: abnormal fetal development, intrauterine growth retardation, infection, multiple pregnancy, genetic diseases, maternal-fetal blood type incompatibility, etc.

3. Maternal factors: overdue pregnancy, pregnancy-induced hypertension, cardiovascular disease, toxic shock, diabetes, chronic nephritis, cardiovascular disease, systemic infection, abdominal infection, luteal insufficiency leading to decidual dysplasia, severe anemia or heart failure, strong mental stimulation, trauma, etc.

4. Placental factors: placental abruption, etc.

Local factors of the uterus: excessive uterine tension or strong contraction, uterine fibroids, uterine malformations, uterine rupture and other local ischemia that affect the placenta and fetus.

This situation does not rule out the possibility of fetal growth retardation. There are many reasons for fetal growth retardation, including immune factors, genetic factors, infectious factors, blocking antibody factors, endocrine factors, anatomical factors, etc. Generally, fetal growth retardation occurs in the first pregnancy. If the cause cannot be found, it will not be possible to preserve the fetus blindly in the future, and multiple miscarriages are very harmful to the body. It is recommended to go to the hospital for a comprehensive examination, clarify the cause of fetal growth retardation, and provide targeted treatment. It is recommended to check again after ten days.