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How common is it for people with learning disability to also have epilepsy? |
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The frequency of epilepsy
occurring in people with learning disability is higher than in the
average population and increases in proportion to the severity of
their disability. About 30% of people with a learning disability
also have some form of epilepsy, however, in those people with a
severe learning disability atleast 50% will have additional epilepsy.
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What is the link between learning disability and epilepsy? |
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Both epilepsy and learning
disability are outward symptoms of underlying brain dysfunction
or damage. Generally, this damage has existed from birth. If the
mother has an infection such as rubella or abuses drugs or alcohol,
the developing brain of the baby may be damaged. Some learning disabilities
are genetic such as Down's Syndrome or Tuberous Sclerosis. Head
injuries from accidents, high fevers, brain infections or tumors
can also cause brain damage.
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Treatment of these seizures is more difficult and they are often more severe, more frequent
and harder to control.
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How can seizures be identified in someone with a learning disability? |
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There are many types of
seizure and some take the form of quite strange behavior sequences.
Seizures may be particularly unusual in people with learning disability
and can easily go unrecognised. This may be more likely in people
who have poor communication skills. |
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Any strange behaviour such
as long periods of confusion or unusual physical activity may be
the sign of a seizure. If any unusual behaviour occurs which you
think might be a seizure, it is important to observe it closely
and write down what you see. Many people with a learning disability
show unusual behaviour which might not be a seizure but another
sign of brain damage. Tests such as the EEG (if done whilst this
activity is occurring) will determine whether or not this is seizure
activity. Sometimes people will need special assessment to determine
this.
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Can anti-epileptic medication cause behaviour problems? |
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Anti-epileptic medication
may make people feel drowsy or sick and it may affect their vision,
but it seldom causes behaviour problems. The damaged brain is more
vulnerable to the side- effects of anti-epileptic medication and
obviously, if someone is not able to communicate what they are feeling
this may result in withdrawn or sometimes aggressive behaviour.
Sometimes, side- effects of medication such as slowing, inattention,
restlessness, and unsteadiness when walking may be difficult to
distinguish from the signs of underlying neurological disorder.
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regularly should serum levels be tested?
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It is probably not good
practise to rely heavily on drug levels for anti-epileptic drugs
with maybe the exception of phenytoin. They provide a rough guide
to dosing but should not be over- emphasised. The main reasons for
checking blood levels are for testing drug compliance, to document
overdoses and suspected drug interactions. They should be used when
there is a clinical need rather than on a routine basis. The rules
about testing serum levels should be the same for people with a
learning disability as for anybody else. |
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Can epilepsy impair cognitive functioning? |
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Cognitive difficulties in
individuals with learning disabilities are invariably due to the
underlying brain damage which gives rise to the epilepsy. If the
seizures are under optimal control, then further cognitive difficulties
are unlikely. Seizures, however, if poorly controlled and particularly
if undetected may result in additional impairments of cognitive
function. Improvements may then occur if seizure control improves,
although high levels of medications are to be avoided as this also
would have a negative impact on mental alertness.
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Is neurosurgery an option for people with a learning disability? |
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At one time, people with
learning disabilities were not considered good candidates for surgical
treatment of seizures. More recently, a more positive view is taken.
However, as for individuals without learning disabilities, not everyone
is suitable for surgery and each case requires close examination
with careful consideration of the potential benefits and possible
adverse effects of the surgery.
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