[Value of electroencephalographic findings in the prognosis of Lennox-Gastaut syndrome].

The electroencephalographic findings observed in twenty-nine patients with Lennox-Gastaut syndrome were related with prognosis of the epileptic manifestations. The presence of slow spike-wave complexes with preponderance of spike over the slow wave and the presence of fixed complexes in spite of the medical treatment, are related with poor prognosis for the epileptic manifestations.