Auditory evoked potential

The study of auditory evoked potentials (AEP) records the electrical activity of the auditory nerve pathways of the ear and brain. It is performed in a physiology laboratory either in primary care or in a hospital.

Auditory provoked potential - the process

The evoked potential is a graphical expression of the information carried by the stimulated nerve. In AEP, the aim is to study the functioning of the auditory neuronal pathways of the ear and brain. Changes in the latent period and amplitude of the AEP indicate the presence of damage to the auditory pathways. For example, it can identify a neurinoma or damage to the nerve sheath in multiple sclerosis. An AEP is also performed as part of the assessment of cerebrovascular accidents (CVA), head injuries, comas, etc.

The AEP procedure

No preparation is required. The patient lies down with a cap and electrodes placed on his/her scalp, ear lobes and forehead. Each ear is investigated separately. The examination lasts an average of 20 minutes.

Possible risks of AEP

The AEP carries no risks.

Source: The Merck manual, 4^th edition