Evoked Potentials Somatosensory

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Somatosensory evoked potentials (SEP)

Vertex . Parietal (reference) / (active)

Vertex . Parietal (reference) / (active)

C2 ' t vertebra (active)

C2 ' t vertebra (active)

5 ms

The sensory evoked potential is recorded over the parietal cortex in response to stimulation of a peripheral nerve (e.g. median nerve). Other electrodes sited at different points along the sensory pathway record the ascending activity. Subtraction of the latencies between peaks provides conduction time between these sites.

Central conduction time (CCT): sensory conduction time from the dorsal columns (or nuclei) to the parietal cortex.

Uses: Detection of lesions in the sensory pathways - brachial plexus injury

- spinal cord and brainstem tumours or demyelination.

Peroperative recording - straightening of scoliosis 1 .

- removal of spinal tumours/AVM J

- aneurysm operation with temporary vessel occlusion - CCT. Motor Evoked Potential (MEP)

Subtraction of the latencies between motor evoked potentials elicited by applying a brief magnetic stimulus to either the motor cortex, the spinal cord or the peripheral nerves gives peripheral and central motor conduction velocities. The use of MEP in clinical practice awaits further evaluation.


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