Subjects were 5 patients with anti-MAG and/or anti-SGPG antibody associated neuropathy. We performed conventional motor conduction studies in unilateral median, ulnar and tibial nerves. The cut-off point of distal temporal dispersion was set at 9ms based on a previous report.
Distal CMAP duration was prolonged in 4 of 5 patients. Among 13 responses, 50 % (median), 60 % (ulnar) and 75 % (tibial) presented distal temporal dispersion. There were negative correlation between distal CMAP duration and conduction velocity (R[2] = 0.63, p = 0.0012), and positive correlation between distal CMAP duration and distal latency (R[2] = 0.75, p = 0.0001).
Our findings suggest that distal temporal dispersion is not rare in patients with anti-MAG/SGPG antibody associated neuropathy, which is in contrast to previous reports.