title: Additional method for diagnosis of carpal tunnel syndrome: value of the second lumbrical-interossei test (2L-INT).
abstract: We examined 57 hands referred with suspected carpal tunnel syndrome (CTS) using the second lumbrical-interossei nerve test (2L-INT) as well as standard test. Sensory nerve conduction velocity (SCV) was detectible in 67% of patients (38/57), the abductor pollicis brevis-compound muscle action potential (APB-CMAP) in 84% (48/57), 2L-CMAP in 96% (55/57) and the first interossei palmares muscle (INT-CMAP) in 100% (57/57). ABP-CMAP was not recorded in patients in whom severe atrophy of the abductor pollicis brevis muscle was evident. As 2L-CMAP is maintained even in the most severe cases of CTS, the 2L-INT method is a valuable test for improving the accuracy of preoperative diagnosis in the electrophysiological diagnosis of CTS.
authors: Department of Orthopaedics, National Hospital Organization, Fukui National Hospital, Fukui, Japan. tinukai@nhofukui.org
authors: Tomoo
authors: T
authors: Inukai
authors: Kenzo
authors: K
authors: Uchida
authors: Chikara
authors: C
authors: Kubota
authors: Takaharu
authors: T
authors: Takamura
authors: Hideaki
authors: H
authors: Nakajima
authors: Hisatoshi
authors: H
authors: Baba
mesh_terms: D000200:Action Potentials / Q000502:physiology*; D002349:Carpal Tunnel Syndrome / Q000175:diagnosis* / Q000503:physiopathology; D003937:Diagnosis, Differential; D004568:Electrodiagnosis / Q000379:methods*; D005260:Female; D006801:Humans; D008475:Median Nerve / Q000503:physiopathology*; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000294:innervation* / Q000503:physiopathology; D014459:Ulnar Nerve / Q000503:physiopathology*