RESUMO
We determined the motor terminal latency index (MTLI) of the median nerve across the carpal tunnel in 41 upper extremities of 31 patients with carpal tunnel syndrome. Changes in motor nerve conduction velocity (MNCV), motor terminal latency (MTL), sensory action potential and the amplitude of the compound muscle action potential recorded from the abductor pollicis brevis muscle were all suggestive of proximal and distal segment involvement of the nerve across the carpal tunnel. There was no correlation between forearm MNCV and MTL (r = 0.40), although MTLI was correlated with MTL (r = 0.67) but not with MNCV, indicating a disproportionate conduction across the carpal tunnel.
Assuntos
Síndrome do Túnel Carpal , Nervo Mediano/fisiopatologia , Destreza Motora/fisiologia , Condução Nervosa/fisiologia , Índice de Gravidade de Doença , Potenciais de Ação , Adulto , Idoso , Idoso de 80 Anos ou mais , Síndrome do Túnel Carpal/classificação , Síndrome do Túnel Carpal/diagnóstico , Síndrome do Túnel Carpal/fisiopatologia , Estudos de Casos e Controles , Eletromiografia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Tempo de Reação , Sensação/fisiologiaRESUMO
We determined the motor terminal latency index [MTLI] of the median nerve across the carpal tunnel in 41 upper extremities of 31 patients with carpal tunnel syndrome. Changes in motor nerve conduction velocity [MNCV], motor terminal latency [MTL], sensory action potential and the amplitude of the compound muscle action potential recorded from the abductor pollicis brevis muscle were all suggestive of proximal and distal segment involvement of the nerve across the carpal tunnel. There was no correlation between forearm MNCV and MTL [r = 0.40], although MTLI was correlated with MTL [r = 0.67] but not with MNCV, indicating a disproportionate conduction across the carpal tunnel
