Motor terminal latency index in carpal tunnel syndrome.
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.
Kabiraj
M M
MM
Department of Neurology and Clinical Neurophysiology, King Khalid University Hospital, King Saud University, Riyadh, Saudi Arabia.
al-Rajeh
S
S
al-Tahan
A R
AR
Abdulijabbar
M
M
al-Bunyan
M
M
D000200:Action Potentials; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002349:Carpal Tunnel Syndrome / Q000145:classification / Q000175:diagnosis / Q000503:physiopathology; D016022:Case-Control Studies; D004576:Electromyography; D005260:Female; D006801:Humans; D008297:Male; D008475:Median Nerve / Q000503:physiopathology*; D008875:Middle Aged; D009048:Motor Skills / Q000502:physiology*; D009431:Neural Conduction / Q000502:physiology*; D011930:Reaction Time; D012677:Sensation / Q000502:physiology; D012720:Severity of Illness Index