Somatosensory evoked potentials in neuro-proctology

Purpose: SSEP of the pudendal nerve have been established in neurophysiological evaluation of anorectal dysfunction. Alternatively, tibial nerve SSEP and perianal SSEP are frequently used. It is not yet clear whether the procedures provide a comparable diagnostic statement. Methods: We recorded all the said SSEP in 31 patients (20 women, 56.2±11.2 years). Results: The P40– latencies were 42.0±3.99 ms (right tibial), 41.8±3.9 ms (left tibial), 38.6±4.4 ms (pudendal), 36.4±2.4 (right anal) and 36.5±2.8 ms (left anal). Only the tibial nerve showed a good correlation to each other. All the others correlated only wea…