All EEGs with reported delta slowing were re-reviewed by two board-certified clinical neurophysiologists blinded to clinical history. Seizure history, response to treatment, and EEG reports were reviewed. Patients with epileptic encephalopathy syndromes such as Lennox-Gastaut syndrome were excluded. Methods: Children with absence epilepsy with EEGs performed at the Mayo Clinic in Rochester, MN between January 2003 and February 2013 were identified from the EEG database. This study determined the prevalence of PRDA among children with absence epilepsy and evaluated other associated EEG and epilepsy features. PRDA is underrecognized and often misinterpreted as a pathological focal finding or epileptiform. Rationale: Posterior rhythmic delta activity (PRDA) is a non-specific interictal EEG finding characterized by trains of monomorphic delta waveforms over the posterior head regions, reported in children with generalized absence epilepsy.
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