Carpal tunnel syndrome: clinical, epidemiological and nerve conduction studies in 668 cases. / Síndrome do túnel do carpo: aspectos clínico-epidemiológicos e de condução nervosa em 668 casos.

AUTOR(ES)
DATA DE PUBLICAÇÃO

1998

RESUMO

Carpal tunnel syndrome: clinical, epidemiological and nerve conduction studies in 668 cases Between January/89 and June/96, 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) 1.0 ms that strongly supports electrodiagnosis of CTS (standard deviation >6) after simultaneous stimulation on wrist and recording on thumb. The age ranged from 17 to 83 years (mean 47.5) and 91.3% were female; the complaints were bilateral in 72% and nocturnal/awakening in 85.3%; pain, numbness and paraesthesia occurred in 64.4%; pain as the only symptom was rare but proximal extension was frequent (39.4%); all fingers were symptomatic in 42.5%, followed by middle, middle-ring, thumbindex- middle and then index-middle-ring ones; there was no correlation with traumatic past history on wrist. The duration CTS symptoms ranged from 1 to >120 months without precise correlation with the severity of conduction abnormalities on median nerve. MRD 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 3.01 ms, middle finger 3.14 ms and ring finger 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 1.0 ms is very sensitive for CTS diagnosis.

ASSUNTO(S)

compressão nervosa neurology neurologia neurologia carpal tunel síndrome compresión nervosa síndrome do túnel carpal síndromes de compressão nervosa nerve crush síndrome del túnel carpiano

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