amniotic band syndrome

(redirected from Amniotic bands)

amniotic

 [am″ne-ot´ik]
pertaining to the amnion.
amniotic band syndrome a condition characterized by isolated or multiple constriction defects of the fingers, toes, limbs, and less frequently the skull, face, or viscera. It results from a tear of unknown etiology in the amnion, which allows amniotic fluid and fetal parts to escape from the amnion into the chorion. When the amnion and chorion are separated, strands from either the maternal amnion or the fetal chorion may entangle fetal parts. As the fetus grows the strands become more constrictive, causing defects.
amniotic fluid the albuminous fluid contained in the amniotic sac; called also liquor amnii and, informally, waters. The fetus floats in this fluid, which serves as a cushion against injury from sudden blows or movements and helps maintain a constant body temperature for the fetus. Normally the fluid is clear and slightly alkaline; discoloration or excessive cloudiness may indicate fetal distress or disease, as in erythroblastosis fetalis in which fluid is usually greenish yellow. The amount varies from 500 to 1500 ml.

An excessive amount of amniotic fluid (more than 2000 ml) is called hydramnios; the amount may be as much as several gallons. The cause of this condition is unknown but it frequently accompanies multiple pregnancy or some congenital defect of the fetus, especially hydrocephalus and meningocele.

An abnormally small amount of amniotic fluid is referred to as oligohydramnios; there may be less than 100 ml of fluid present. The cause is unknown. The condition may produce pressure deformities of the fetus, such as clubfoot or torticollis. Adhesions may result from direct contact of the fetus with the amnion.

Removal of a sample of amniotic fluid from the pregnant uterus is called amniocentesis.

amniotic band sequence

activity comprising early rupture of the amnion with formation of bands that adhere to or compress parts of the fetus, resulting in a wide variety of anomalies: craniofacial defects, amputation of a limb, and abdominal evisceration.

amniotic band syndrome

A triad of amnion-denuded placenta; foetal attachments to, or entanglement by, amniotic remnants; and foetal deformation, malformation or limb disruption.

amniotic band 'syndrome'

Obstetrics A triad of amnion-denuded placenta, fetal attachments to, or entanglement by, amniotic remnants, and fetal deformation, malformation, or limb disruption. See ADAM complex, Sequence.
References in periodicals archive ?
The rare condition occurs in the womb when the amniotic bands wrap around a foetus and become tangled, which in turn restricts the blood flow to certain parts of the body.
7,8 Other hypotheses include rupture of amniotic bands,9 teratogenic factors, intrauterine infections like chickenpox, zoster or herpes simplex, fetal exposure to cocaine, heroin, alcohol or antithyroid drugs, oligohydramnios and external compressions.
Every hand device the students create is donated free to kids born with Amniotic Band Syndrome, a group of congenital birth defects caused by the entrapment of fibrous amniotic bands.
Wang, "Prenatal sonographic diagnosis of acrania associated with amniotic bands," Journal of Clinical Ultrasound, vol.
Body stalk defects, body wall defects, amniotic bands with and without body wall defects, and gastroschisis: comparative epidemiology.
Postulated factors include disturbance of the interactions of growth factors,2 teratogenic drugs like meclizine,7 trauma late in pregnancy and local ischaemia and amniotic bands causing pressure on the first branchial arch.
Zak was born with severe physical disabilities caused when amniotic bands in the womb wrap around limbs.
Five-month-old Maddison Robinson suffers from amniotic band syndrome (ABS), which occurs when a foetus becomes trapped in fibrous amniotic bands in the womb.
The bubbly youngster, from Clifton Courtyard in North Belfast, was born with a rare illness - Amniotic Bands Syndrome - which affected the formation of his fingers, toes and right leg in the womb.
Mechanical: Amniotic bands, Oligohydramnios, Uterine Defects, etc.
by placental infarcts or solitary umbilical artery), intrauterine trauma, premature rupture of amniotic membranes or amniotic bands.
Preevacuation hysteroscopy can also confirm or rule out amniotic bands, Meckel-Gruber syndrome, Klippel-Trenaunay-Weber syndrome, and first-trimester varicella.