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Titolo:
Sequential changes of orthodromic sensory nerve action potentials induced by experimental compression of the median nerve at the wrist
Autore:
Tani, T; Ushida, T; Kimura, J;
Indirizzi:
Kochi Med Sch, Dept Orthopaed Surg, Nankoku, Kochi 7838505, Japan Kochi Med Sch Nankoku Kochi Japan 7838505 , Nankoku, Kochi 7838505, Japan Univ Iowa Hosp & Clin, Dept Neurol, Iowa City, IA 52242 USA Univ Iowa Hosp& Clin Iowa City IA USA 52242 rol, Iowa City, IA 52242 USA
Titolo Testata:
CLINICAL NEUROPHYSIOLOGY
fascicolo: 1, volume: 112, anno: 2001,
pagine: 136 - 144
SICI:
1388-2457(200101)112:1<136:SCOOSN>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
ENDONEURIAL FLUID PRESSURE; CONDUCTION BLOCK; SCIATIC-NERVE; SPINAL-CORD; BLOOD-FLOW; ISCHEMIA; CAT; DEFORMATION; PRINCIPLES; PITFALLS;
Keywords:
nerve compression; ischemia; conduction block; compound sensory nerve action potential; phase cancellation; waveform analysis;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Tani, T Kochi Med Sch, Dept Orthopaed Surg, Kohasu Oko Cho, Nankoku, Kochi7838505, Japan Kochi Med Sch Kohasu Oko Cho Nankoku Kochi Japan 7838505 05, Japan
Citazione:
T. Tani et al., "Sequential changes of orthodromic sensory nerve action potentials induced by experimental compression of the median nerve at the wrist", CLIN NEU, 112(1), 2001, pp. 136-144

Abstract

Objective: We studied sequential waveform changes associated with a progressive conduction block to elucidate the relative vulnerability of slow versus fast conducting fibers to a focal compression. Methods: In 12 healthy men, orthodromic compound sensory nerve action potentials (SNAPs) of the median nerve were recorded unipolarly at 4 sites overthe forearm during a 30 min period of constant, localized compression of the nerve at the wrist. Results: Initial findings at the compression site consisted of nearly immediate reduction in size of the negative component accompanied by progressive enlargement of the initial-positive component. Recording at 2 cm proximalto the compression and at the elbow showed no change in onset latency initially, indicating at least partial preservation of the fast conducting fibers. Amplitude also remained unchanged for about 20 min, presumably because loss of negative and positive peaks compensated each other until conductionblock began to involve a greater number of the fast conducting fibers. Conclusions: The analysis of waveform changes and their time course suggests that a focal compression initially affects the slow conducting small diameter fibers. Partial conduction block gives rise to complex waveform changes depending on recording sites. A reduction in one polarity of constituentnerve fiber action potentials may enhance the other polarity of the SNAP. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/01/20 alle ore 10:49:31