Symptoms of post-yolk sac fetal arrest

After confirming the pregnancy, a B-ultrasound examination is required, mainly to check the development of the embryo and fetal heart. After pregnancy, everyone hopes that the fetus can develop normally. However, some people will experience fetal arrest after pregnancy, which is something no one wants to see. Therefore, we must be aware of the symptoms of fetal arrest after yolk sac pregnancy, and take timely measures to deal with them when abnormalities are found.

Symptoms of post-yolk sac fetal arrest

Fetal arrest is different from miscarriage. Although the fetus has stopped developing, it is not expelled from the body in time. Therefore, fetal arrest is also called "missed abortion." After embryonic arrest, some pregnant mothers experience gradual reduction or disappearance of various early pregnancy reactions such as nausea, vomiting, and breast swelling, while some pregnant mothers do not have any symptoms until the prenatal check-up ultrasound examination discovers them.

1. When the average gestational sac diameter is ≥25 mm, no fetal bud is seen.

2. When the head-to-hip diameter is ≥7 mm, no fetal heart beat is detected.

3. In a gestational sac without yolk sac, there is still no embryo or fetal heartbeat after 2 weeks.

4. In a gestational sac with a yolk sac, no embryo or fetal heartbeat is seen after 11 days or longer.

Causes of embryonic arrest

1. Chromosomal abnormalities

The embryo itself will follow the natural law of "survival of the fittest". If serious abnormalities in the number or structure of chromosomes occur, it will often stop developing naturally.

2. Endocrine disorders

If you want the embryo, this small seed, to take root, germinate, and grow normally, the mother needs to provide it with a safe and comfortable environment, and in particular, the levels of important hormones such as estrogen and progesterone must be maintained at a certain level. If the mother's hormone secretion is insufficient to meet the needs of embryonic development, it may cause fetal arrest, the most common of which is luteal insufficiency.

Pregnant women with corpus luteum insufficiency usually have abnormalities in other glandular functions, which can cause them to suffer from diseases such as hyperthyroidism or hypothyroidism, diabetes, etc. These diseases are not conducive to embryonic development and are closely related to miscarriage.

3. Abnormal intrauterine environment

Common ones include endometrium that is too thin or too thick, uterine fibroids, endometriosis, uterine malformation, intrauterine adhesions, etc.

4. Immune factors

If the mother suffers from autoimmune diseases, such as systemic lupus erythematosus, or reproductive immune abnormalities, such as positive anti-endometrial antibodies and anti-ovarian antibodies, it may lead to fetal arrest.

5. Intrauterine infection

Severe intrauterine infection in early pregnancy may cause fetal arrest or miscarriage, such as mycoplasma, toxoplasma, herpes zoster virus, rubella virus, cytomegalovirus, herpes simplex virus, etc.

6. Physical and chemical factors

In the early stages of pregnancy, the embryo is extremely sensitive to physical, chemical and environmental changes. Various harmful factors may damage the embryo, leading to fetal arrest, miscarriage, malformation or developmental delay.