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NCS in Inherited neuropathy

KHUSHNUMA MANSUKHANI10/6/20 6:23 AM (CDT)
In  a patient with a severe inherited peripheral neuropathy- if the distal CMAPs (and SNAPs) are absent from the lower and upper limb nerves - how do we define whether it is predominantly demyelinating or only pure axon degenerative? 
We could think of the following :
1.Recording over the FCR /FCU muscle and stimulating the Median/Ulnar nerve at the elbow and mid arm : any data available for defining when it should be called demyelinating?
2. R1 & R2 components of  blink reflex if prolonged is it demyelinating ?
Could not find any defined criteria for this -would appreciate inputs please 
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