PMC8258779_01
Motor-nerve conduction studies focused on the right median nerve on admission. Prolonged distal latency, slowed conduction velocities, and conduction block between the wrist and elbow are observed. MCV, motor-nerve conduction velocity.
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Nerve conduction studies revealed bilateral conduction block in the median nerve between the wrist and elbow segment (Fig. 1).
Clinical course. We examined the grasping power and VEP within 1 week before and after IVIg. VEP to checkerboard pattern reversal stimulation was recorded at midline occipital portion (MO). Before IVIg treatment, there is bilateral deterioration of grasping power in the hands, although P100 latencies are within the normal range (<121.0 ms). After every IVIg treatment, an improvement in the grasping power is observed. In addition, P100 latencies have shortened significantly (p = 0.03; Wilcoxon's signed rank-sum test). VEP, visual evoked potential; IVIg, intravenous immunoglobulin.
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There was significant post-treatment shortening in the latencies (Rt, 103.4 +- 2.4 ms; Lt, 103.4 +- 0.9 ms; p = 0.03, Wilcoxon's signed-rank sum test) (Fig. 2, Supplementary Figure).