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Oligohydramnios is a medical condition in pregnancy characterized by a deficiency of amniotic fluid, the fluid that surrounds the fetus in the abdomen, in the amniotic sac. The limiting case is anhydramnios , where there is a complete absence of amniotic fluid.
Post-maturity is more likely to happen when a mother has had a post-term pregnancy before. After one post-term pregnancy, the risk of a second post-term birth increases by 2 to 3 times. [8] Other, minor risk factors include an older or obese mother, a white mother, male baby, or a family history of post-maturity. [9]
Several conditions and risk factors can lead to fetal distress or non-reassuring fetal status, [1] including: Low amniotic fluid (oligohydramnios) If there is too little amniotic fluid around the baby in the uterus, the baby can have trouble moving around in the uterus and its growth and temperature can be impacted.
Women with abnormal amounts of amniotic fluid, whether too much (polyhydramnios) or too little (oligohydramnios), are also at risk. [35] Anxiety and depression have been linked as risk factors for preterm birth. [35] [61] The use of tobacco, cocaine, and excessive alcohol during pregnancy increases the chance of preterm delivery.
The greatest risk factors are an abnormal position of the baby within the uterus and a premature or small baby. [2] Other risk factors include a multiple pregnancy, more than one previous delivery, and too much amniotic fluid. [2] [3] Whether medical rupture of the amniotic sac is a risk is controversial.
The risk of placental abruption increases sixfold after severe maternal trauma. Anatomical risk factors include uncommon uterine anatomy (e.g. bicornuate uterus), uterine synechiae, and leiomyoma. Substances that increase risk of placental abruption include cocaine and tobacco when consumed during pregnancy, especially the third trimester.
Another risk factor is premature birth in which medical intervention, such as premature birth prevention or C-section delivery, can be used as prevention for intrauterine hypoxia. [ 37 ] Studies have shown a connection between tetrahydrobiopterin (BH 4 ) deficiency and hypoxia-ischemia brain injury, though further studies need to be done. [ 38 ]
The study also found no significant difference in rates of pregnancy loss between twin pregnancies that underwent amniocentesis and those that did not before 24 weeks of gestation. [38] Maternal factors that may further increase the risk of pregnancy loss following amniocentesis include: [1] [2] Presence of uterine fibroids