Conduction block

What is conduction block? 

Conduction block is a focal abnormality across a nerve segment that results in failure to conduct an action potential typically due to focal disruption of the myelin sheath.

Distal to the block, conduction is preserved.

In conduction block, a compound muscle action potential (CMAP) drop of 30% to 50% is recorded between the distal and proximal stimulation sites.


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