Evoked potentials are potentials that are derived from the
peripheral or central nervous system. They are time locked with an
external stimulus and can be influenced by subjective intentions.
Evoked potentials have become increasingly popular for clinical
diagnosis over the last few years. Evoked potentials from the
visual system are used by ophthalmologists in order to localize the
abnormalities in the visual pathway. The otologists are mainly
involved in brainstem auditory evoked potentials, while the
pediatricians, neonatologists, neurologists and clinical
neurophysiologists make use of multimodal stimulation. The
psychiatrists and psychologists, generally, examine the slow
potentials such as P300 and CNV. Anesthesiologists use short
latency somatosensory and visual evoked potentials in order to
monitor the effectiveness of the anesthesia. Pharmaco evoked
potentials are very promising measures for the quan tification of
the effectiveness of drug action on the cerebral cortex. Urologists
are more and more involved in pudendal somatosensory evoked
potentials and in the intensive care unit evoked potentials are
used in order to monitor the functional state of the central
nervous system of the patient. This overwhelming number of
examinations and exam ina tors clearly demonstrates the need for
guidelines and standardization of the methods used. The evoked
potential metholody is restricted by the relative poor signal to
noise ratio. In many diseases this signal to noise ratio decrease
rapidly during the progression of the illness. Optimal technical
equipment and methodology are therefore essential."
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