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SEP interpretation

Somatosensory EP interpretation

QuestionAnswer
Absence of all waves Peripheral nerve lesion, rule out technical problem
Absent EP with normal P14 and N20 Normal
Increased EP latency with equally increased P14 and N20 latencies; decreased peripheral nerve conduction velocity with normal central conduction time Peripheral nerve lesion, rule out technical problem
Increased clavicular-spinal conduction time with normal peripheral conduction and normal cervical-scalp conduction time Defect between the brachial plexus and the lower medulla
Absent cervical potential and abent or delayed scalp potential Defect between the brachial plexus and the somatosensory cortex
Increased cervical-scalp central conduction time with normal peripheral conduction and normal clavicular-cervical potential Defect above the lower medulla at or below the somatosensory cortex
Absent scalp potential with normal peripheral conduction and normal clavicular-cervical conduction time Defect between the lower medulla and the somatosensory cortex
Decreased peripheral conduction velocity and increased central conduction time Combination of peripheral nerve lesion and central defect
Increased latency of all SEPs at all levels Hypothermia; inaccurate measurement of distance between stimulating and recording electrodes
Created by: schmittse
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