EEG with hyperventilation-induced epileptiform discharges

What it means

Epileptiform discharges induced by hyperventilation (overbreathing) in cerebral electrical activity recorded along the scalp by electroencephalography (EEG).

Hyperventilation (overbreathing) is widely used as a diagnostic procedure to activate epileptiform EEG discharges.

Rare diseases that can present with this1

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category