Methods for calculating EEG-based epileptiform activity index

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Electroencephalography (EEG) is mainly used for epilepsy diagnostics in modern clinical practice. Epileptiform activity index (EAI) is recognized as one of the essential quantitative parameters for assessing the presence of epileptiform activity by using EEG. However, depending on EAI calculation method, the result may vary dramatically. In this regard, the term “epileptiform activity index” per se is not defined very clearly and remains unambiguous. Different manufacturers of EEG equipment like different medical specialists may put different meanings into this concept and understand it differently. The article discusses possible EAI calculation methods for EEG and clarifies the understanding of this term.