Investigating a Car Crash Case

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Investigating a Car Crash Case

Questions posed by this case:

* Why did the Connie crash the car?

* What triggered her status epilepticus?

* Was she taking phenytoin at the time, if so why did IT not prevent

her fit?

* How did Connie become pregnant if she was taking oral

contraceptives?

PHENYTOIN

COULD PHENYTOIN LEVELS BECOME UNSTABLE LEADING TO SEIZURE?

In most patients maintained at a steady dosage, stable phenytoin serum

levels are achieved.

Patients with unusually low levels may be noncompliant or

hypermetabolizers of phenytoin.

As phenytoin is highly protein bound, free phenytoin levels may be

altered in patients whose protein binding characteristics differ from

normal

.Determine Connie's plasma levels, if low, she may not be complying.

Since she has been stable for more than two years we can assume she

has no protein binding problems.

PHENYTOIN - ORAL CONTRACEPTIVE INTERACTION

Hepatic enzyme-inducing anti-epileptic drugs increase the metabolism

of both progesterone and oestrogen. As the concentrations of these

hormones may be lowered by 50% or more, adjustments are required in

contraceptive regimes to ensure that pregnancy is prevented

Oral contraceptives may have increased metabolism by phenytoin,

carbamazepine and phenobarbital and therefore may not adequately

protect against pregnancy.

TRIGGERS OF STATUS EPILEPTICUS

Abrupt withdrawal of phenytoin in epileptic patients may precipitate

status epilepticus. When, in the judgment of the clinician, the need

for dosage reduction, discontinuation, or substitution of alternative

antiepileptic medication arises, this should be done gradually

It is important to note that antiepileptic drugs should not be

discontinued in patients in whom the drug is administered to prevent

major seizures, because of the strong possibility of precipitating

status epilepticus with attendant hypoxia and threat to life.

RATIONALE FOR DRUGS GIVEN

ANTI-EPILEPTICS

Use in Pregnancy-do they harm the fetus?

· A number of reports suggest an association between the use of

antiepileptic drugs by women with epilepsy and a higher incidence of

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