Arielle Cruz
Fetal Alcohol Syndrome (FAS) is a preventable condition that occurs when a woman consumes alcohol during pregnancy. FAS is the most severe condition within a group of conditions called fetal alcohol spectrum disorders (FASDs). FASDs are preventable conditions that can occur in a person exposed to alcohol before birth and can have lifelong effects, including physical problems, problems with behavior, and learning difficulties. The physical characteristics of FAS include abnormal facial features, such as a smooth philtrum (the groove between the nose and upper lip), small eyes, a thin upper lip, and growth deficits (height and/or weight ≤10%). Other physical features associated with FASDs include maxillary hypoplasia, micrognathia, decreased interpupillary distance, and structural defects in various organ systems, including the cardiovascular, renal, musculoskeletal, ocular, and auditory systems.
| Characteristics | Values |
|---|---|
| Facial features | Small eyes, thin upper lip, smooth philtrum (groove between nose and upper lip), short palpebral fissures, thin vermillion border |
| Growth | Poor prenatal and/or postnatal growth, low birth weight, small head size, short height |
| Organs and systems | Heart, bone, kidney, eye, central nervous system, musculoskeletal, ocular, auditory, cardiovascular, renal |
| Behavioural and learning problems | Yes |
| Neurobehavioural problems | Yes |
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What You'll Learn
Facial features: small eyes, thin upper lip, smooth philtrum
Fetal Alcohol Syndrome (FAS) is a permanent condition that occurs when a woman consumes any amount of alcohol during pregnancy. Alcohol use during pregnancy can interfere with the baby's development, causing physical and mental defects.
FAS is the most severe condition within a group of conditions called fetal alcohol spectrum disorders (FASDs). FASDs classify the wide-ranging physical and neurological effects that prenatal alcohol exposure can inflict on a fetus.
FAS is diagnosed by the presence of all of the following criteria: two or three characteristic facial features (changes to the face), growth retardation (prenatally and/or postnatally), and central nervous system defects. The three specific facial features that are indicative of FAS are short palpebral fissures, a thin vermillion border, and a smooth philtrum.
Short palpebral fissures refer to small eyes. A thin vermillion border refers to the edge of the lip where it meets the skin of the face, which is often thin in individuals with FAS. A smooth philtrum refers to the vertical groove between the nose and upper lip, which is often flat or smooth in individuals with FAS. These facial features are the result of underdevelopment of the medial nasal processes.
In addition to the facial features described above, other physical characteristics of FAS can include low body weight, short height, small head size, vision or hearing problems, and sleep and sucking difficulties. Symptoms that may develop over time include delayed speech and language development, difficulty concentrating, hyperactivity, learning disabilities, and poor coordination.
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Growth retardation: low birth weight, small head size
Fetal Alcohol Syndrome (FAS) is a preventable condition that occurs when a woman consumes any amount of alcohol during pregnancy. Alcohol use during pregnancy can interfere with the baby’s development, causing physical and mental defects.
Growth retardation is a common characteristic of fetal alcohol syndrome, and can manifest in the following ways:
- Low birth weight: Prenatal alcohol exposure can result in smaller birth weight, with the average birth weight for a full-term child born with FAS being almost two pounds less than non-affected children. This low birth weight can persist through infancy and into young adulthood, with some studies showing alcohol-exposed children in low-income cohorts experiencing weight deficits up to 14 years.
- Small head size: Alcohol-exposed children may also have smaller head circumferences at birth, which can be used to help classify intrauterine growth retardation (IUGR).
- Short height: In addition to weight deficits, children with FAS may also experience height deficits, resulting in a general failure to thrive.
The impact of prenatal alcohol exposure on growth can vary, with some children experiencing more severe growth retardation than others. It is important to note that FAS is a preventable condition, and the only way to prevent it is to avoid consuming alcohol during pregnancy.
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Central nervous system defects: seizures, behavioural issues
Fetal Alcohol Syndrome (FAS) is a permanent condition that occurs when a woman consumes any amount of alcohol during pregnancy. Alcohol use during pregnancy can interfere with the baby's development, causing physical and mental defects. FAS is the most severe condition within a group of conditions called fetal alcohol spectrum disorders (FASDs).
FAS is diagnosed by the presence of all of the following criteria: two of the three characteristic facial features (short palpebral fissures, thin vermillion border, and a smooth philtrum), growth retardation (prenatally and/or postnatally), and central nervous system defects.
Central nervous system defects are a common feature of FAS and can manifest in a variety of ways. These defects can range from seizures to behavioural issues and learning disabilities. People with FAS may experience problems with learning, memory, attention span, communication, and social interaction. They might also exhibit impulsive behaviour and have challenges with judgment and school performance.
The CNS is particularly vulnerable to the effects of ethanol during prenatal development. Severe exposure can lead to gross morphological abnormalities and an overall decrease in white matter. Damage to neural stem cell progenitor pools that give rise to neurons and glia is believed to be a major factor contributing to these abnormalities.
The effects of prenatal alcohol exposure on the CNS were first observed in the late 1960s and early 1970s, and FAS was officially defined in 1973 to describe the combination of pre- and postnatal growth deficiencies, facial abnormalities, and neurological defects associated with prenatal alcohol exposure.
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Heart, bone and kidney problems
Fetal Alcohol Syndrome (FAS) is a permanent condition that occurs when a woman consumes any amount of alcohol during pregnancy. Alcohol use during pregnancy can interfere with the baby's development, causing physical and mental defects. It is the most severe condition within a group of conditions called fetal alcohol spectrum disorders (FASDs). FASDs classify the wide-ranging physical and neurological effects that prenatal alcohol exposure can inflict on a fetus.
Heart Problems
Prenatal alcohol exposure has been linked to cardiac anomalies. Structural defects may occur in the cardiovascular system, leading to abnormal heart development. These defects can range from mild to severe and may require medical intervention.
Bone Problems
FAS can cause bone development issues, resulting in abnormal bone growth and structure. This can include maxillary hypoplasia, micrognathia, and decreased interpupillary distance. These bone abnormalities can lead to a distinctive facial appearance associated with FAS, including small eyes, a thin upper lip, and a smooth philtrum (the groove between the nose and upper lip).
Kidney Problems
Renal dysfunction is a significant concern in children with FAS. Studies have shown that fetuses exposed to ethanol perinatally exhibit several renal functional abnormalities, including impaired renal acidification and potassium excretion, as well as defects in urinary concentration abilities. These abnormalities can persist even in the absence of structural kidney anomalies. Additionally, prenatal alcohol exposure has been linked to urinary and kidney anomalies, suggesting a direct impact on the urogenital system.
The physical characteristics of FAS related to heart, bone, and kidney problems can vary in severity and manifestation. Early identification and intervention are crucial to help children with FAS reach their full potential and manage any related health issues effectively.
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Vision and hearing problems
Fetal Alcohol Syndrome (FAS) is a permanent condition that occurs when a woman consumes any amount of alcohol during pregnancy. Alcohol use during pregnancy can interfere with the baby's development, causing lifelong physical and mental defects.
Vision Problems
Individuals with FAS may experience a range of vision problems, including decreased visual acuity, refractive errors, and eye movement disorders. They may also have structural abnormalities in the ocular system, including microphthalmia (small eyes) and decreased interpupillary distance. These structural abnormalities can lead to impaired vision and even blindness in some cases. Additionally, FAS can cause issues with visual processing, which can affect the individual's ability to interpret and understand visual information.
Hearing Problems
Hearing loss or impairment is also a common issue for individuals with FAS. This can range from mild hearing loss to profound deafness. The hearing problems may be caused by structural defects in the ear, such as abnormalities in the outer, middle, or inner ear. These defects can affect the transmission of sound to the brain, resulting in hearing impairment. Additionally, FAS can lead to central auditory processing disorders, where the brain has difficulty interpreting sound signals, even when the ears are functioning properly.
The presence of vision and hearing problems in individuals with FAS can significantly impact their daily lives. These issues can interfere with their ability to learn, communicate, and interact with their environment. Early identification and intervention are crucial to providing the necessary support and accommodations for those affected.
It is important to note that the severity of vision and hearing problems in FAS can vary depending on various factors, including the amount and timing of alcohol exposure during pregnancy. Additionally, these problems may occur in isolation or in combination with other physical and neurological symptoms associated with FAS.
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Frequently asked questions
Fetal Alcohol Syndrome (FAS) is a permanent condition that occurs when a woman consumes any amount of alcohol during pregnancy. It is the most severe condition within a group of conditions called fetal alcohol spectrum disorders (FASDs).
The physical characteristics of fetal alcohol syndrome include abnormal facial features, such as a smooth philtrum (the groove between the nose and upper lip), small eyes, a thin upper lip, and short palpebral fissures. People with FAS may also experience growth problems, including low birth weight and small head size (microcephaly).
In addition to physical characteristics, FAS can cause mental and emotional challenges, including problems with learning, memory, attention span, communication, and behavior. These challenges can impact a person's social life, education, and work.
FAS can be prevented by avoiding alcohol consumption during pregnancy. It is recommended that women who are trying to get pregnant or think they may be pregnant also refrain from drinking alcohol.
