[Carpal tunnel syndrome: sensory median-radial latency difference versus conduction studies in 1059 hands (668 cases)].

Abstract:

:Between January 1989 and June 1996, 1,059 carpal tunnel syndrome hands (CTS) from 668 patients were studied. None had been previously operated and all had bilateral conduction studies; peripheral neuropathy was excluded. The patients were selected with sensory median/radial difference (MRD) > or = 1.0 ms that strongly supports electrodiagnosis of CTS (standard deviation > 6) after simultaneous stimulation on wrist and recording on thumb. Normal MRD were obtained in 125 hands with upper limit of normality = 0.43 ms (mean + 2SD). The age ranged from 17 to 83 years (mean 47.5) and 91.3% were female. MRD > or = 1.0 ms correlates in 95% with median distal motor latency > 4.25 ms (80 mm distance) and with median distal sensory latency to index finger > or = 3.01 ms, middle finger > or = 3.14 ms and ring finger > or = 3.26 ms, all of them 140 mm distance, antidromic and onset-measured. The results have brought new values for the limit of normality in our EMG laboratory since MRD > or = 1.0 ms is very sensitive for CTS diagnosis.

journal_name

Arq Neuropsiquiatr

authors

Kouyoumdjian JA

doi

10.1590/s0004-282x1999000200008

subject

Has Abstract

pub_date

1999-06-01 00:00:00

pages

208-15

issue

2A

eissn

0004-282X

issn

1678-4227

journal_volume

57

pub_type

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