Premature rupture of membranes how is it shown on ultrasound?

Written by Zhang Lu
Obstetrics
Updated on January 11, 2025
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Ultrasound is a commonly used auxiliary method for diagnosing premature rupture of membranes. After the membranes rupture prematurely, amniotic fluid intermittently leaks out from the uterine cavity, but the production of amniotic fluid often cannot keep up with the leakage. Therefore, the majority of pregnant women with premature rupture of membranes will experience a reduction in amniotic fluid volume. Ultrasound will reveal that there is still a small amount of amniotic fluid in the amniotic cavity, but the volume is much lower than the normal range; the maximum depth of the amniotic fluid should be less than three centimeters, and the amniotic fluid index should be less than eight centimeters, which is a common occurrence. However, sometimes, if not much amniotic fluid leaks out after premature rupture of membranes, the ultrasound may sometimes show that the amniotic fluid volume is normal. In such cases, it is necessary to combine this finding with the patient's clinical symptoms to jointly determine the presence of premature rupture of membranes.

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Written by Yue Hua
Obstetrics and Gynecology
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What are the risks of premature rupture of membranes?

After premature rupture of membranes, the amniotic cavity is directly connected to the woman's vagina at this time, which primarily poses the risk of infection. If the fetus becomes infected, it is easy to lead to sepsis after birth, resulting in an increased mortality rate for the fetus. Additionally, it can cause bleeding in the fetus. Moreover, for the mother, there is a likely risk of placental abruption, which is due to the reduced abdominal tension after membrane rupture, making placental abruption more likely to occur. Furthermore, the mother is also prone to infections, which can easily lead to chorioamnionitis under these circumstances.

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Written by Zhao Li Li
Obstetrics
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What will happen to fetal movement if the membranes rupture prematurely?

Generally, if premature rupture of membranes occurs, it is necessary to clearly determine the specific development of the embryo and the specific gestational age. If the fetus is preterm with premature rupture of membranes, it is necessary to promptly provide anti-infection treatment and promote fetal lung maturity among other symptomatic treatments. If the fetus is already at term, it is important to closely monitor the specific condition of cervical dilation and abdominal pain to decide on the mode of delivery. Normally, premature rupture of membranes does not affect fetal movement at all. A fetal heart rate monitoring test can be conducted to clarify the specific situation of the embryo's development within the uterine cavity and whether there is any fetal hypoxia, to comprehensively analyze the situation.

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Written by Liu Wei Jie
Obstetrics
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Will the fetus still move if the membranes rupture prematurely?

Firstly, it is necessary to identify what the issue of premature rupture of membranes is. Premature rupture of membranes can occur during early pregnancy or the mid-to-late pregnancy stage and involves uncontrollable leakage of fluid from the vagina. If there is no umbilical cord prolapse after the rupture of membranes, the baby will definitely move. The most common issues following premature rupture of membranes are umbilical cord prolapse and infection, as well as a reduction in amniotic fluid. What should be done after premature rupture of membranes occurs? It is essential to remain in bed, raise the buttocks, and avoid getting out of bed. Getting out of bed increases the risk of umbilical cord prolapse, and following umbilical cord prolapse, fetal death in utero can occur, after which fetal movement will no longer be observed.

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Written by Liu Wei Jie
Obstetrics
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Premature rupture of membranes causes

The causes of premature rupture of membranes, or premature rupture of membranes, occur before labor when the membranes break. Normally, the membranes should rupture during labor when the cervix is fully dilated. Any rupture before this is called premature rupture of membranes. The main causes of premature rupture of membranes are maternal infections or cephalopelvic disproportion. Infections can cause the membranes to become fragile and thin, and movements afterwards may lead to premature rupture. Another scenario is cephalopelvic disproportion, where the fetus is relatively large and the pelvis is small, leading to changes in amniotic fluid pressure, which can also result in premature rupture of membranes.

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Written by Zhang Lu
Obstetrics
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Premature rupture of membranes symptoms

Premature rupture of membranes, as the name implies, refers to the clinical symptoms caused by the rupture of the amniotic sac before labor. These symptoms include the following aspects. First, there will be a leakage of amniotic fluid from the vagina, manifesting as wet pants or a wet bedsheet, which is a primary indication of premature rupture of membranes. Second, when the membranes rupture prematurely, there is often a small amount of bloody show. This is mainly because there are small capillaries on the membranes that also bleed when the membranes rupture, causing blood to mix with the amniotic fluid. Third, premature rupture of membranes often is accompanied by significant contractions, as the increase in pressure within the amniotic cavity during contractions can cause the membranes to rupture. When these situations occur, it is important to promptly go to the hospital to undergo an ultrasound and gynecological examination to confirm whether there is a premature rupture of membranes.