The nerve conduction in the nervous system is measured using magnetic or electrical stimuli. This allows us to check how signals are transmitted from the arm or leg to the brain (somatosensory evoked potentials, SEP), from the inner ear to the balance center (auditory evoked potentials, FAEP), or from the retina to the visual center (visually evoked potentials, VEP).
Description of the examination
Evoked potentials are measurements used to check how quickly and efficiently stimuli are transmitted in the nervous system. Typically, small electrical or magnetic impulses are applied to the arm, leg, eye, or ear for this purpose. Electrodes on the head, back, or other areas then register how the central nervous system reacts to these stimuli. This creates curves that provide information about the conductivity of certain nerve pathways.
There are various types of evoked potentials, such as visually evoked potentials (VEP), auditory evoked potentials (AEP), or somatosensory evoked potentials (SEP). Each variant is based on the sensory organ to be tested or the area of the body being examined. If necessary, several types of potentials can be measured one after the other.
When is this examination necessary?
Evoked potentials are used when the function of certain nerve pathways needs to be examined. This is relevant, for example, if there is a suspicion of multiple sclerosis or another demyelinating disease. In the case of unclear sensory disturbances or balance problems, the measurements also help to determine the location of possible damage more precisely.
In addition, this examination method is used when it comes to long-term monitoring of already diagnosed neurological diseases. This makes it easier to assess disease activity or progress under ongoing therapy.
Is this examination painful or uncomfortable?
Most types of evoked potentials are not painful. You will only feel brief impulses that may feel like a slight tingling or tapping. With magnetic stimuli, you may hear a rapid clicking or knocking sound generated by the device.
Since no needles are used and no invasive techniques are necessary, the risk of complications is minimal. As a rule, you can resume your normal daily routine immediately after the examination.