evoked potential
A neurophysiological response recorded from the nervous system following stimulation of sensory pathways.
Full Definition
Evoked potentials (EPs) are electrical responses of the nervous system to specific sensory stimuli, measured using surface electrodes placed over relevant anatomical regions. These tests evaluate the integrity and function of sensory pathways from peripheral receptors through the spinal cord to the brain cortex. The three main types are visual evoked potentials (VEPs), auditory brainstem responses (ABRs), and somatosensory evoked potentials (SSEPs). Evoked potential studies are valuable for detecting subclinical lesions, monitoring disease progression in conditions like multiple sclerosis, and assessing neurological function during surgical procedures. The amplitude, latency, and morphology of responses provide diagnostic information about pathway integrity.
Usage
Usage note: Specify the type of evoked potential (visual, auditory, somatosensory) for clarity in clinical documentation.
In Context
- "Visual evoked potential testing showed prolonged P100 latencies bilaterally, suggesting optic pathway dysfunction." — Neurophysiology diagnostic report
- "Intraoperative somatosensory evoked potential monitoring detected signal changes requiring immediate surgical intervention." — Surgical monitoring report