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Amniotic fluid. The amniotic fluid is the protective liquid contained by the amniotic sac of a gravid Amniote. This fluid serves as a cushion for the growing fetus, but also serves to facilitate the exchange of nutrients, water, and biochemical products between mother and fetus. For humans, the amniotic fluid is commonly called water or waters (Latin liquor amnii)
In a normal patient, amniotic fluid doesnât enter the maternal circulation system; it remains safely contained inside the uterus, sealed off by the amniotic sac. AFE occurs when the barrier between the amniotic fluid and maternal circulation is broken, and the amniotic fluid enters the motherâs venous system. The most likely time for this thankfully very rare event to occur is during delivery, or during a pregnancy termination.