Epilepsy and non-localized brain dysfunction have been invoked, among
others, as underlying factors in borderline personality disorder. We h
ave recorded 58 electroencephalograms in 20 borderline patients, first
after complete drug washout and then under carbamazepine or placebo d
ouble-blind treatment. Taking into account only definite abnormal trac
ings, we found a 40% incidence of abnormal diffuse slow activity. No p
atient disclosed focal or epileptiform EEG features. Carbamazepine did
not appear to modify the electroencephalogram. (C) 1998 Elsevier Scie
nce Ireland Ltd.