A survey of instutionalized patients with clinical diagnosis of probab
le dementia of the Alzheimer type (DAT) indicated that 21% of patients
developed seizures after the onset of DAT. Of the total of 27 patient
s, 11 developed seizures at home and 16 after institutionalization. In
9 of the 11 patients (82%), who suffered the initial seizure at home,
the patients' condition suddenly worsened and required long-term care
admission within 6 months of the seizure onset. Language function dec
lined significantly more rapidly in 5 patients with seizures than in c
ontrols matched by age and duration of DAT.