Adult epilepsy.
Abstract
The
epilepsies are one of the most common serious brain disorders, can
occur at all ages, and have many possible presentations and causes.
Although incidence in childhood has fallen over the past three decades
in developed countries, this reduction is matched by an increase in
elderly people. Monogenic Mendelian epilepsies are rare. A clinical
syndrome often has multiple possible genetic causes, and conversely,
different mutations in one gene can lead to various epileptic syndromes.
Most common epilepsies, however, are probably complex traits with
environmental effects acting on inherited susceptibility, mediated by
common variation in particular genes. Diagnosis of epilepsy remains
clinical, and neurophysiological investigations assist with diagnosis of
the syndrome. Brain imaging is making great progress in identifying the
structural and functional causes and consequences of the epilepsies.
Current antiepileptic drugs suppress seizures without influencing the
underlying tendency to generate seizures, and are effective in 60-70% of
individuals. Pharmacogenetic studies hold the promise of being able to
better individualise treatment for each patient, with maximum
possibility of benefit and minimum risk of adverse effects. For people
with refractory focal epilepsy, neurosurgical resection offers the
possibility of a life-changing cure. Potential new treatments include
precise prediction of seizures and focal therapy with drug delivery,
neural stimulation, and biological grafts.
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