An electroencephalogram (EEG) is a test that measures and records the electrical activity of your brain. Special sensors (electrodes
) are attached to your head and hooked by wires to a computer. The computer records your brain's electrical activity on the screen or on paper as wavy lines. Certain conditions, such as seizures
, can be seen by the changes in the normal pattern of the brain's electrical activity.
Ambulatory EEG monitoring is a prolonged EEG done while the patient is at home. Patients come into the laboratory to receive portable monitoring equipment and have the EEG electrodes placed on their head. The patient is then sent home with the EEG equipment attached, and are monitored for one or more days. The patient will then come back to the laboratory daily to have the equipment removed and the data evaluated.