normal measures of median nerve motor and sensory latency in carpal tunnel syndrome
نویسندگان
چکیده
background : despite the high incidence and prevalence of cts, there is no exclusive data about normal values increment of motor and sensory distal latencies of median nerve at wrist according to age. this research was done in electrodiagnosis lab of physical medicine & rehabilitation ward in nemazi hospital in shiraz between 1374-1379. material and methods : this study was performed on 1200 cases that had no history of paresthesia and numbness in both hands and no history of diabetes mellitus, systemic disease, and electrodiagnosis evidence of no cervical radiculopathy or peripheral neuropathy. tinel’s and phallen’s tests were also negative in all cases. normal values, increment of motor and sensory distal latencies of both hands median nerves were studied and analyzed in ten age groups from 10-80 years. results : in this study, the mean normal value for distal motor latency of median nerve was 3.3 ms (2.50-4.20ms). increment of this value is mild (about 0.1ms per decade after 5th decade of life) and could be calculated with the following formula: dml (8cm)= (3.30+ ) ± 0.0025age. the mean normal value for distal sensory latency of median nerve was 3.2ms (2.7-3.70ms). increment of his value is mild (about 0.1ms per decade after the 5th decade of life) that could be calculated with the following formula: dsl (14cm) =(3.20 + ) ± 0.0025age. conclusions : it seems that age has significant influence on distal motor and sensory latencies at wrist. we recommend electrodiagnostic evaluations to be performed according to the age
منابع مشابه
Normal median nerve proximal latency in carpal tunnel syndrome: a clue to coexisting Martin-Gruber anastomosis.
Five of 65 patients referred for electrodiagnosis because of clinical evidence of carpal tunnel syndrome were found to have near normal latency on proximal stimulation of the median nerve, although the distal motor latency was prolonged. In one patient, the proximal latency was actually shorter than the distal latency. The failure of the proximal latency to be prolonged in proportion to the dis...
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متن کاملNerve Conduction Studies of Median Motor Nerve and Median Sensory Branches According to the Severity of Carpal Tunnel Syndrome
OBJECTIVE To evaluate each digital branch of the median sensory nerve and motor nerves to abductor pollicis brevis (APB) and 2nd lumbrical (2L) according to the severity of carpal tunnel syndrome (CTS). METHODS A prospective study was performed in 67 hands of 41 patients with CTS consisting of mild, 23; moderate, 27; and severe cases, 17. Compound muscle action potentials (CMAPs) were obtaine...
متن کاملCarpal Tunnel Syndrome and Median Nerve Lesions
Carpal tunnel syndrome (CTS) is by far the most common cause of median nerve damage. The carpal tunnel is an anatomical compartment of the hand; it is bounded on three sides by carpal bones which form an arch, and on the palmar side by the transverse carpal ligament. Pathogenesis CTS results from compromise of median nerve function at the wrist, caused by increased pressure in the carpal tunnel...
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فیضجلد ۸، شماره ۳، صفحات ۱۹-۲۴
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