Amniotic Fluid Problems. Amniotic fluid is an important part of pregnancy and fetal development....
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Amniotic Fluid Problems
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Amniotic fluid is an important part of pregnancy and fetal development. This watery fluid is inside a casing called the amniotic membrane (or sac) and fluid surrounds the fetus
throughout pregnancy. Normal amounts may vary, but, generally,
women carry about 500 ml of amniotic fluid
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Amniotic fluid helps protect and cushion the fetus and plays an important role in
the development of many of the fetal organs including the lungs, kidneys, and
gastrointestinal tract. Fluid is produced by the fetal lungs and kidneys. It is taken up with fetal swallowing and sent across the
placenta to the mother's circulation
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Amniotic fluid problems occur in about 7 percent of pregnancies. Too
much or too little amniotic fluid is associated with abnormalities in
development and pregnancy complications. Differences in the
amount of fluid may be the cause or the result of the problem
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What causes oligohydramnios
premature rupture of membranes (before labor)
intrauterine growth restriction (poor fetal growth)
post-term pregnancy birth defects, especially kidney and
urinary tract malformations twin-to-twin transfusion syndrome
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Ultrasound examination shows anhydramnios. Scans of the renal fossae fail to demonstrate the kidneys and bladder
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Why is oligohydramnios a concern
Amniotic fluid is important in the development of fetal organs,
especially the lungs. Too little fluid for long periods may cause abnormal
or incomplete development of the lungs called pulmonary hypoplasia. Intrauterine growth restriction (poor fetal growth) is also associated with decreased amounts of amniotic fluid
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Oligohydramnios may be a complication at delivery, increasing
the risk for compression of the umbilical cord and aspiration of thick
meconium (baby's first bowel movement).
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What causes hydramnios
Maternal factors: diabetes
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Fetal factors: gastrointestinal abnormalities that block the
passage of fluid abnormal swallowing due to problems with
the central nervous system or chromosomal abnormalities
twin-to-twin transfusion syndrome heart failure congenital infection (acquired in pregnancy)
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Why is hydramnios a concern
Too much amniotic fluid can cause the mother's uterus to become overdistended and may lead to
preterm labor or premature rupture of membranes (the amniotic sac).
Hydramnios is also associated with birth defects in the fetus.
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When the amniotic sac ruptures, large amounts of fluid leaving the
uterus may increase the risk of placental abruption (early
detachment of the placenta) or umbilical cord prolapse (when the
cord falls down through the cervical opening) where it may be
compressed
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