An Overnight EEG / 24hour EEG may sometimes be requested when a routine EEG does not provide clear answers to the physician. This type of EEG is often more helpful, because of its longer duration (several hours as opposed to the 20 minutes of a routine EEG) and includes a large portion of sleep. Sleep is an important method to increase the chances of detecting abnormalities in the EEG, due to the fact that sleep is a major activation method for evoking EEG abnormalities.
When is an Overnight EEG / 24hour EEG typically requested?
- The Overnight EEG / 24hour EEG is especially helpful in the diagnosis of Temporal Lobe Epilepsy (TLE), as the specific signs of TLE are often absent in a routine EEG
- It is a useful test to help a physician to decide whether it is safe for a patient to stop using their anti-convulsants or anti-epileptic medication
- Whenever there are doubts about the results of a routine EEG or if more information is needed
For more information on the Overnight / 24 hour EEG or to book an appointment, please Contact Us.