Electroencephalographic findings in Tanzanian epileptic patients.

Electroencephalogram (EEG) of 524 Tanzanian epileptic patients seen between 1985 and 1987 were reviewed. Over two thirds were young patients between the ages of five and thirty. Four hundred and fifty (86%) had abnormal records. Eighty nine per cent of abnormal records had focal abnormality and 11% had centrencephalic abnormality. Grand mal seizures did not imply centrencephalic abnormality, only 13% had such abnormality. Petit mal seizures are rare, over one third of these had temporal focal abnormality. Partial seizures were associated highly with focal abnormality. However, complex partial seizures did not imply temporal focal abnormality. Implications of EEG findings to correlation with epileptic seizures is discussed.