In this lecture, I?m going to review fetal alcohol syndrome.
It?s not a genetic syndrome.
Well, maybe it is a little bit in that alcoholism
is a little bit genetically inherited
but it?s not a genetic syndrome because these patients acquire this disease
as a result of exposure in utero to alcohol that the mother drinks.
The reason I?m bringing it up in the genetics course
is because it presents with such syndromic features
that it?s often mistaken as a genetic syndrome
and people call geneticists to make this diagnosis.
So, let?s go through it.
Fetal alcohol syndrome occurs in roughly 1% of all live births
in the United States.
You think that?s a lot. It is a lot. It?s way too many.
But the disease does have variable penetrants
depending on the degree of exposure
and also the underlying genetics of the child,
so it?s somewhat hard to really know for sure what this rate is.
This is the most common cause of teratogenic intellectual disability
in the United States.
The risk increases in certain circumstances.
Patients are more likely to have infants
who are born with fetal alcohol syndrome
if these women have a high-dose exposure in utero.
So, with a blood alcohol level of more than 150mg/dl,
that infant is at increased risk for exposure.
It?s hard to really correlate that with how many drinks
but if a patient is drinking more than 2g/kg/day of alcohol,
that?s gonna be a problem.
It?s also associated with binge drinking.
In patients who don?t drink much on the weekdays
but then get a little bit drunk on the weekends, there?s a concern.
Alcoholics have a 30 to 50% chance of having a child born
with multiple problems with fetal alcohol syndrome.
Alcoholism is a bad disease
and when they get pregnant, their children are at substantial risk.
So, how does it happen?
Alcohol crosses the placenta and reaches the fetus.
The fetus needs the mother?s hepatic detoxification.
Infants don?t have alcohol dehydrogenase activity in their fetal liver.
So, it?s really the mother?s clearance of the drug
that the fetus is requiring.
The amniotic fluid though, acts as a reservoir for alcohol.
So, while the mother may clear it from her system,
it?s going to persist in the amniotic fluid
and these infants get prolonged fetal exposure of alcohol.
And remember ethanol and its metabolite acetaldehyde
will alter fetal development.
So, it?s not just ethanol, it?s also its next metabolite, acetaldehyde.
So how do these children present?
Well, they may have shortened palpebral fissures.
The palpebral fissure remember is just the opening of the eye
and it can be a bit shorter. They may have a flattened mid face.
They may have a long and flat philtrum.
The philtrum remember is those 2 little lines under the nose.
It will be a little flattened so you almost can?t see them
and a little bit longer.
And they may have a thin upper lip
or a thin vermilion border on the upper lip.
So, a long flat philtrum and a thin upper lip,
and then the flattened mid face and the shortened palpebral fissures.
The nose may also angle a little bit up.
So here?s some examples of patients with fetal alcohol syndrome.
You can see these patterns on all these children.
So, what else can go wrong?
If it?s just a problem with the face, why are we so worried?
Well, these children will typically have growth retardation.
Their birth weight will be low
and they will have a decelerating weight gain
and they will have a thin body habitus.
They can have brain abnormalities, structural brain abnormalities
such as microcephaly or even an absent corpus callosum
or a reduced generation of a cerebellum.
They can have structural problems
that can cause significant neurologic disease.
They may have cognitive abnormalities as well with poor impulse control,
attention deficit or attention deficit hyperactivity disorder,
they may have language deficits, and they may be less capable of doing math.
And, these patients may have birth defects
such as congenital heart disease or urinary tract abnormalities.
And lastly, they may have extremity defects.
You may see the hockey-stick crease
which is an angular crease in the shape of a hockey stick on the palm,
and they may have small distal phalanges.
So how do we treat these patients?
Well, we have to fix any congenital heart disease
or anything else that?s going on,
but the mainstay of therapy is intervention
in terms of behavior and intellectual development.
We need to get these kids plugged in to early intervention
so they can maximize their young childhood intellectual development.
We need to put them in programs like Head Start
and get them into good schools with good programs
and to find them individual learning plans that work for the family.
Also, it?s critical to counsel families about prevention.
We need to talk to parents about how they can prevent future pregnancies
from also having fetal alcohol syndrome.
We need to counsel women to avoid drinking while pregnant.
So that?s my review of fetal alcohol syndrome.
Thanks for your time.