ELECTRODIAGNOSTIC TESTS AND INTRAOPERATIVE MONITORING. INTRODUCTION. Evoked response studies are recordings of the nervous system's electrical response to the stimulation of specific sensory pathways (e.g., visual, auditory, general sensory).
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Electrical activity induced in visual cortex by light stimuli
Rods and Cones
Anatomical basis of the VEP:
Anterior visual pathways
Lateral geniculate body
Occipital lobe, visual cortex
The common waveforms- N75,P100,N145.
Assessment of abnormal VEP
1-Latency prolongation2-Amplitude reduction
3-Combined latency and amplitude abn.VEP ABNORMALITIES
lesion of the lower brainstem
IN HEAD AND SPINAL INJURY
Documenting motor deficit
TYPES OF WAVE FORMS :
less drug usage
faster wake-up in the OR
earlier discharge eligibility from the PACU
higher quality recovery
significant cost savings.