Jackson D A, Clifford J C
Department of PM&R, St. Vincent Hospital, Ottawa, Ontario, Canada.
Arch Phys Med Rehabil. 1989 Mar;70(3):199-204.
Electrophysiologic tests have been reported to detect mild carpal tunnel syndrome (CTS). Such tests include (i) absolute palmar latency of median wrist segment; (ii) comparison of median and radial distal sensory latencies in digit I; (iii) comparison of median and ulnar distal sensory latencies in digit IV; (iv) comparison of median and ulnar palmar latencies; (v) comparison of median and ulnar sensory potential amplitudes in digits II and V. To clarify the clinical utility of these tests, the parameters of all five tests were determined across four carefully established patient subgroups: group A, controls; group B, CTS referrals with normal nerve conduction studies (NCS) and normal needle electromyography (EMG); group C, CTS referrals with abnormal NCS and normal EMG; group D, CTS referrals with abnormal NCS and abnormal EMG. Special attention was focused on patients in group B who represent the diagnostic dilemma. In group B, tests ii and iii each yielded abnormal results in 44% of hands, while the combination of tests ii and iii yielded abnormal results in 51% of hands.
据报道，电生理测试可检测轻度腕管综合征（CTS）。此类测试包括：（i）正中神经腕部节段的绝对掌侧潜伏期；（ii）示指正中神经和桡神经远端感觉潜伏期的比较；（iii）环指正中神经和尺神经远端感觉潜伏期的比较；（iv）正中神经和尺神经掌侧潜伏期的比较；（v）示指和小指正中神经和尺神经感觉电位幅度的比较。为阐明这些测试的临床效用，在四个精心确定的患者亚组中测定了所有五项测试的参数：A组，对照组；B组，神经传导研究（NCS）和针极肌电图（EMG）均正常的CTS转诊患者；C组，NCS异常但EMG正常的CTS转诊患者；D组，NCS和EMG均异常的CTS转诊患者。特别关注代表诊断困境的B组患者。在B组中，测试ii和iii在44%的手部产生了异常结果，而测试ii和iii的组合在51%的手部产生了异常结果。
