___ he electroencephalogram (EEG) is often the single most informative laboratory test in evaluating a children with seizures. At the most rudimentary level, it helps in differentiating epileptic from nonepileptic behavior. Because many conditions, including breathholding spells, movement disorders, syncope, cardiac arrhythmias, sleep disorders, migraine, and various psychiatric syndromes, may mimic epilepsy, EEG findings are often essential in making an accurate diagnosis.
EEG, however, offers much more. More detailed analysis of epileptiform abnormalities assists in distinguishing focal from generalized seizures and in identifying epileptic syndromes, which are indispensable cornerstones of rational therapy. EEG aids in recognizing subclinical and nonconvulsive seizures, in documenting antiepileptic drug (AED) toxicity, and probably in selecting patients for AED withdrawal after remission of seizures. Finally, EEG is critical in evaluating patients with medically refractory seizures for focal resective and other surgical procedures.
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