Electromyographic diagnosis of the carpal tunnel syndrome

Toyonaga, K.; Faria, C. R. de

doi:10.1590/S0004-282X1978000200004

Abstracts

Sensory conduction velocities of the median nerVe were studied from digit to palm and from palm to wrist in normal subjects and in patients with the carpal tunnel syndrome. Definite slowing was noted in the palm to wrist segment, even in the early carpal tunnel syndrome. It was noted that 37% of normal women over 40 years of age had electrophysiological evidence of the carpal tunnel syndrome.

Velocidades de condução de fibras sensitivas do nervo mediano foram estudadas dos dedos à palma e da palma ao punho, em indivíduos normais e portadores de síndrome do tunel carpiano. Diminuição da velocidade foi observada no segmento da palma ao punho, mesmo em fases bastante precoces da sindrome. Encontrou-se também que 37% de mulheres clinicamente normais (acima de 40 anos de idade) tinham evidência eletrofisiológica de sindrome do tunel carpiano.

K. Toyonaga C. R. de Faria

Department Of Medicine (Neurology), McMaster University Medical Center, 1200 Main Street West, Hamilton, Ontario, Canada

SUMMARY

Sensory conduction velocities of the median nerVe were studied from digit to palm and from palm to wrist in normal subjects and in patients with the carpal tunnel syndrome. Definite slowing was noted in the palm to wrist segment, even in the early carpal tunnel syndrome. It was noted that 37% of normal women over 40 years of age had electrophysiological evidence of the carpal tunnel syndrome.

RESUMO

Velocidades de condução de fibras sensitivas do nervo mediano foram estudadas dos dedos à palma e da palma ao punho, em indivíduos normais e portadores de síndrome do tunel carpiano. Diminuição da velocidade foi observada no segmento da palma ao punho, mesmo em fases bastante precoces da sindrome. Encontrou-se também que 37% de mulheres clinicamente normais (acima de 40 anos de idade) tinham evidência eletrofisiológica de sindrome do tunel carpiano.

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Author's present address:

Dr. K. Toyonaga Okinawa Central Hospital 192 Miyasato Gushikawa Okinawa Japan.

Dr. C. R. DeFaria Instituto de Neurologia de Goiânia Caixa Postal 157 74000 Goiânia, GO Brazil.

1. ASBURY, A. K. Renaut bodies, a forgotten endoneurial structure. J. Neuropathol. Exper. Neurol. 32:334, 1973.
2. BUCHTHAL, F. & ROSENFALCK, A. Sensory conduction from digit to palm and from palm to wrist in the carpal tunnel syndrome. J. Neurol. Neurosurg. Psychiat. 34:243, 1971.
3. BUCHTHAL, F.; ROSENFALCK, A. & TROJABORG, W. Electrophysiological findings in entrapment of the median nerve at wrist and elbow. J. Neurol. Neurosurg. Psychiat. 37:340, 1974.
4. CSEUZ, K. A.; THOMAS, J. E.; LAMBERT, E. H.; GRAFTON LOVE, J. & LIPSCOMB, P. R. Long-term results of operation for carpal tunnel syndrome Mayo Clinic Proc, 41:232, 1966.
5. JOHNSON, R. K. & SHREWSBURY, M. M. Anatomical course of the thenar branch of the median nerve, usually in a separate tunnel through the transverse carpal ligament. J. Bone Joint Surg. 52-A :269, 19170.
6. McCOMAS, A. J.; SICA, R. E. P.; CAMPBELL, M. J. & UPTON, A. R. M. Functional compensation in partially denervated muscles. J. Neurol. Neurosurg. Psychiat. 34:453, 1971.
7. NEARY, D.; OCHOA, J. & GILLIATT, R. W. Subclinical entrapment neuropathy in man. J. Neurol. Sciences. 24:283, 1975.
8. PAYAN, J.-Electrophysiological localization of ulnar nerve lesion. J. Neurol. Neurosurg. Psychiat. 32:208, 1969.
9. PHALEN, G. S. The carpal tunnel syndrome. J. Bone Joint Surg. 48-A:211, 1966.
10. SEDAL, L.; MCLEOD, J. G. & WALSH, J. C. Ulnar nerve lesions associated with the carpal tunnel syndrome. J. Neurol. Neurosurg. Psychiat. 36:118, 1973.
11. UPTON, A. R. M. & McCOMAS, A. J. The double crush in nerve entrapment syndromes. Lancet 2:359, 1973.
12. WJEDERHOLT, W. C. Median nerve conduction velocity in sensory fibers through carpal tunnel. Arch. Physical Med. Rehabilit. 51:328, 1970.