Fetal hydantoin syndrome is a rare disorder that affects babies exposed to certain anticonvulsant medications in the womb, causing birth defects, developmental delays, and intellectual disabilities. The condition is characterized by distinct craniofacial abnormalities and can be prevented, diagnosed, and treated through various methods of rehabilitative and behavioral therapy.
The healthcare team for treating fetal hydantoin syndrome may include pediatricians, oral surgeons, plastic surgeons, neurologists, psychologists, and others. The treatment of fetal hydantoin syndrome is directed towards the specific symptoms that are apparent in each individual and may require adjusting medications before pregnancy or while pregnant. Adequate counseling regarding the need to control seizures, their adverse effects, and the teratogenicity of AEDs should be done.
Fetal hydantoin syndrome is a drug-related embryofetopathy that can occur when an embryo/fetus is exposed to the anticonvulsant drug phenytoin, characterized by distinct symptoms. Five unrelated children born to epileptic women treated with hydantoin anticonvulsants were found to have a similar broad multi-system pattern of abnormalities, including fetal hydantoin syndrome.
After the identification of children with fetal hydantoin syndrome, supportive therapy is carried out to minimize manifested somatic or intellectual abnormalities. Early intervention can improve outcomes for these children, and it is essential to provide adequate counseling about the use of hydantoin, carbamazepine, and other anticonvulsant drugs.
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How can fetal hydantoin syndrome be prevented?
Fetal hydantoin syndrome is a fetal disorder that occurs when a woman takes phenytoin during pregnancy as an anticonvulsant, which is indicated in some forms of epilepsy. The syndrome affects approximately 4-7 of newborns exposed to the drug in the womb. To prevent malformations, women should take a folic acid supplement and start taking the vitamin before conception. The damage caused by phenytoin during pregnancy is irreversible, making prevention crucial. Symptoms include seizures, seizures in the brain, and seizures in the brain. Diagnosis is based on the presence of phenytoin in the womb.
What does phenytoin do to baby?
Between 1993 and 2007, approximately 1 in 5 people with epilepsy were prescribed antiepileptic drugs, with phenytoin being the most common. This is due to its well-established human teratogen status, increasing the risk of having a child with congenital malformations. Fetal hydantoin syndrome, which includes growth retardation, characteristic facies, cleft lip, limb anomalies, and heart defects, is a common result of phenytoin exposure during the first trimester of pregnancy.
Phenytoin exposure during the first trimester of pregnancy increases the risk of maxillary hypoplasia, with a prevalence of 16. 7 in one study. This is part of a continuum resulting from underdevelopment of the maxillary processes (MP). In a rat model of fetal hydantoin syndrome, litters with CL fetuses were always observed within litters containing other fetuses with MH.
Phenytoin’s embryotoxicity has been suggested to cause disturbances in folate metabolism, embryonic hypoxia due to phenytoin-induced bradycardia, or free radical formation via prostaglandin pathways. Similarities between phenytoin-induced malformations and those produced by maternal hypoxia or drug-induced embryonic bradycardia have led to the proposal of an over-arching fetal hypoxia syndrome. Cleft lip and palate also occur with high frequency in offspring of type I diabetic mothers.
What birth defects can be prevented?
To prevent neural tube defects, it is imperative that women consume 400 micrograms of folic acid daily, a B vitamin, both before and during pregnancy. This vitamin can be obtained from fortified foods, dietary supplements, or a combination of both. Folic acid is the only form of folate that has been proven to assist in the prevention of birth defects, making it a vital nutrient during the early stages of pregnancy.
What heart defects are associated with fetal hydantoin syndrome?
About one-third of children born to mothers taking phenytoin during pregnancy experience intrauterine growth restriction, small head, minor dysmorphic craniofacial features, limb defects, heart defects, and developmental delays. A smaller population may have growth problems, developmental delay, or intellectual disability. Heart defects and cleft lip may also be present. Fetal hydantoin syndrome is not diagnosed through diagnostic testing, but a diagnosis is made clinically based on characteristic symptoms in the affected infant and a history of phenytoin exposure during gestation. Most infants born to mothers taking phenytoin during pregnancy will not develop the syndrome.
How can fetal abnormalities be prevented?
Prenatal care is crucial for preventing birth defects and pregnancy complications. A daily prenatal vitamin with at least 400 micrograms of folic acid can help prevent various birth defects. It is recommended for individuals of reproductive age, actively trying to conceive, or upon discovering pregnancy. Avoiding alcohol, tobacco, and illegal drugs can also help prevent birth defects. It is important to be aware of past or current conditions, such as spina bifida, to help plan preventive measures for future pregnancies.
High-resolution ultrasounds by certified prenatal ultrasound groups can help diagnose defects that will significantly impact the baby before birth. Pregnant women should have the first-trimester nuchal translucency scan between 11 and 14 weeks and the anatomy scan between 18 and 20 weeks, as these two ultrasounds provide the best opportunity for detecting birth defects.
What are the symptoms of a hydantoin overdose?
The neurotoxic effects of phenytoin are concentration-dependent and can range from mild nystagmus to severe adverse effects, including ataxia, slurred speech, vomiting, lethargy, and even coma or death. The occurrence of side effects is associated with the total plasma concentration of phenytoin. The development of mild horizontal nystagmus has been observed at concentrations ranging from 10 to 20 mg/L.
What are the side effects of fetal hydantoin syndrome?
Phenytoin exposure in utero can cause developmental delays in infants and children, with some experiencing stiff, tapered fingers, underdeveloped fingers and toes, digitalized toes, malformed fingernails, and toenails. Some infants may also have increased hair on their body and face. As affected children grow older, developmental delays improve, but they may remain slightly behind their unexposed siblings. The neurological effects of phenytoin exposure in utero have not been clearly established, with conflicting results.
Some studies suggest borderline to mild intellectual disability and a greater risk of learning disabilities, particularly in verbal skills. The exact risk of these findings in these children is not fully understood, and more research is needed to determine the specific long-term risks in neurological development. Additional symptoms include congenital heart defects, cardiac rhythm disturbances, behavioral abnormalities, ocular defects, joint laxity, kidney abnormalities, and inguinal and umbilical hernia.
What are the facial features of fetal hydantoin syndrome?
Fetal hydantoin syndrome is a condition affecting babies exposed to certain antiseizure medications during pregnancy, specifically phenytoin (Dilantin®). These medications disrupt normal fetal development and can cause birth defects, developmental delays, and intellectual disabilities. Symptoms at birth include hypertelorism, strabismus, and cleft lip or palate. Healthcare providers work with families to identify the cause and provide appropriate treatment and support. Other features may not be immediately noticeable, but may include developmental delays and intellectual disabilities.
What are the side effects of phenytoin in pediatrics?
Phenytoin is a medication that can cause common side effects such as headaches, drowsiness, sleepiness, dizziness, nervousness, nausea, vomiting, constipation, and sore or swollen gums. These side effects are usually mild and go away by themselves. To cope with them, it is important to rest, drink plenty of fluids, avoid excessive alcohol consumption, consult a pharmacist for painkillers, and consult a doctor if headaches last longer than a week or are severe. As the body adjusts to phenytoin, these side effects should wear off, and it is advised not to drive, ride a bike, or operate machinery until you feel better.
What is the side effect of phenytoin on fetus?
Phenytoin consumption during the first trimester of pregnancy has been linked to an increased risk of fetal hydantoin syndrome, a condition characterized by a combination of birth defects, including growth deficiency, in the offspring.
How to reduce side effects of phenytoin?
In order to effectively manage a phenytoin overdose, it is recommended to adhere to a diet comprising uncomplicated meals and to refrain from consuming foods that are particularly rich or spicy. It is recommended that phenytoin be taken either after a meal or a snack, and that the individual consume a sufficient quantity of fluids. In the event of illness, it is advisable to consume small quantities of water frequently in order to prevent dehydration.
Should symptoms worsen or persist for a period exceeding one week, it is advisable to seek the counsel of a duly qualified medical practitioner. In the event that a combined contraceptive pill or progestogen-only pill is being taken, it is advisable to consult the accompanying information leaflet for guidance.
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