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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.
The main risk factor is a history of diabetes mellitus type 2. [4] Occasionally it may occur in those without a prior history of diabetes or those with diabetes mellitus type 1. [3] [4] Triggers include infections, stroke, trauma, certain medications, and heart attacks. [4] Other risk factors: Lack of sufficient insulin (but enough to prevent ...
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]
Pre-gestational diabetes can be classified as Type 1 or Type 2 depending on the physiological mechanism. Type 1 diabetes mellitus is an autoimmune disorder leading to destruction of insulin-producing cell in the pancreas; type 2 diabetes mellitus is associated with obesity and results from a combination of insulin resistance and insufficient insulin production.
Non-modifiable risk factors include a family history of diabetes, advanced maternal age, and ethnicity. Modifiable risk factors include maternal obesity. [ 14 ] There is an elevated demand for insulin during pregnancy which leads to increased insulin production from pancreatic beta cells .
An AFI smaller than 5–6 cm is considered as oligohydramnios. [3] The exact number can vary by gestational age. The fifth percentile for gestational age is sometimes used as a cutoff value. [7] An AFI larger than 24–25 cm is considered as polyhydramnios. [3] [8]
A fluid or water deprivation test is a medical test [1] which can be used to determine whether the patient has diabetes insipidus as opposed to other causes of polydipsia (a condition of excessive thirst that causes an excessive intake of water). The patient is required, for a prolonged period, to forgo intake of water completely, to determine ...
Illustration of deformed pelvises. A deformed pelvis is a risk factor for obstructed labour: Specialty: Obstetrics: Complications: Perinatal asphyxia, uterine rupture, post-partum bleeding, postpartum infection [1] Causes: Large or abnormally positioned baby, small pelvis, problems with the birth canal [2] Risk factors