What are the reasons for embryonic arrest with no fetal heartbeat?

Written by Du Rui Xia

Obstetrics

Updated on February 24, 2025

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Embryonic arrest without a fetal heartbeat can be caused by many factors. For example, taking medications prohibited during pregnancy, exposure to harmful substances, radiation, or infections with bacteria or viruses during pregnancy. Other factors include genetic issues and poor emotional state of the pregnant woman during pregnancy. All these factors can affect the normal development of the embryo. If an ultrasound examination reveals no fetal heartbeat, it can be determined that the embryo has ceased to develop, and prompt treatment should be carried out.

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Written by Liu Wei Jie

Obstetrics

56sec

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Embryonic arrest generally occurs at what time?

First, let's discuss what embryonic arrest means. There are two scenarios of embryonic arrest. The first scenario is where the embryo initially does not develop well, leading to the cessation of development in the very early stages of pregnancy. The second scenario occurs when the embryo initially develops well, but after a period, embryonic arrest happens. Therefore, embryonic arrest generally occurs during early pregnancy but can also occur later, around the middle of early pregnancy. It can happen at any time, but it is most commonly identified after 8 weeks. However, some cases involve the presence of an embryonic bud and heart tube, and embryonic arrest can still occur even at 10 or 11 weeks.

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Written by Du Rui Xia

Obstetrics

52sec

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Do you need to be hospitalized for a miscarriage due to embryonic arrest?

In cases where there is an embryo arrest, an abortion generally does not require hospitalization. However, if the embryo arrest occurs after three months, then hospitalization is necessary for treatment. For pregnancies of shorter duration, within 50 days, it is usually possible to induce abortion with medication. But if it exceeds 50 days and is within 70 days, a painless surgical abortion can be performed to manage the condition. This scenario generally does not require hospitalization and can be handled in an outpatient gynecological clinic. However, for longer-term pregnancies, there may be complications during the abortion process, and it is advisable to be hospitalized for treatment.

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Written by Zhao Li Li

Obstetrics

45sec

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Does an embryonic arrest still have pregnancy reactions?

After a normal miscarriage, hormone levels do not suddenly drop to a non-pregnant state, so pregnancy reactions may still occur. Simply based on the current state of pregnancy reactions, it is not possible to accurately judge the developmental condition of the embryo in the uterine cavity. It is still necessary to undergo regular prenatal checks after becoming pregnant and monitor the development of the embryo in the uterine cavity via ultrasound. If the embryo has already stopped developing, it is necessary to seek medical treatment for an abortion in a timely manner to avoid causing disorders in the body's coagulation function.

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Written by Zhang Lu

Obstetrics

58sec

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Will the embryo still grow if the embryo has ceased development?

Embryo arrest, also known as missed abortion, refers to the condition in early pregnancy where, due to congenital developmental defects in the gestational sac or other influencing factors, natural development does not occur, resulting in the absence of a fetal heartbeat. Once embryo arrest has been diagnosed, the embryo generally does not continue to grow, because embryo arrest means that the gestational sac has died and is gradually decaying. If a subsequent ultrasound check reveals that the embryo may have grown slightly since the previous examination, this should not be considered as growth continuation of the embryo, but rather attributed to measurement error. Therefore, once embryo arrest is detected and meets diagnostic criteria, timely re-examination may show some lengthening of the embryo. However, in the absence of a fetal heartbeat, it still needs to be treated as embryo arrest, and an abortion procedure should be promptly performed.

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Written by Zhao Li Li

Obstetrics

59sec

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What are the causes of embryonic arrest?

If an embryonic arrest is discovered, there are many specific reasons for the arrest. Firstly, the main reason for embryonic arrest is due to congenital abnormalities in the formation and development of the fertilized egg, which is a relatively common situation. Moreover, embryonic arrest usually occurs early when there are developmental abnormalities. In some cases, it may be caused by maternal factors, such as abnormal diseases in the mother or abnormalities in chromosomes, which can lead to poor embryonic development and subsequently cause embryonic arrest. Occasionally, issues related to the viability of the male sperm, or the presence of abnormal sperm, may also lead to embryonic arrest. Because there are many reasons for embryonic arrest, it is generally not possible to systematically investigate the specific causes.