Two epileptologists blinded to diagnosis visually reviewed all EEGs and annotated all potential epileptiform abnormalities.

Most epileptiform abnormalities show a negative polarity on EEG.

Patients with occipital epileptiform abnormalities presenting with ictal vomiting are often diagnosed as having vague migraine-epilepsy syndromes.

A panel of 9 epileptologists blinded to diagnosis was then surveyed to generate a consensus interpretation of epileptiform abnormalities in each EEG.

Conclusion: Epileptiform abnormalities are common in AD but not all equivalent.