[Critical study of electrophysiologic techniques for exploration of carpal tunnel syndrome]

Carpal tunnel syndrome is the most frequent entrapment neuropathy. Nerve conduction studies and electromyography are useful to appreciate the localization and the degree of nerve involvement, and help to the therapeutic management. Various electrophysiological procedures may be used and are reviewed. For each of them, positive (sensitivity and specificity) and negative points (technical difficulties, errors and false positive) are reported. A guideline is proposed.