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. Author manuscript; available in PMC: 2017 Apr 1.
Published in final edited form as: J Clin Neurophysiol. 2016 Apr;33(2):86–93. doi: 10.1097/WNP.0000000000000241

Figure 1.

Figure 1

The ulnar motor nerve conduction study and ulnar nerve ultrasound in an individual with CIDP are depicted. The nerve conduction studies show a drop in amplitude when stimulation at the wrist is compared to the forearm. Since no median-ulnar anastomosis was detected, and similar amplitude drops were detected in other nerves, this is consistent with a conduction block. At the site of ulnar conduction block in the forearm the ulnar nerve cross-sectional area was greatly increased (28 mm2, indicated by arrow) compared with our reference range (normal < 10 mm2). Additionally, large fascicles can be seen within the nerve. The arrowhead points at the ulnar artery.