Literature DB >> 12208088

Reproducibility of twitch and sniff transdiaphragmatic pressures.

Y M Luo1, N Hart, N Mustfa, W D C Man, G F Rafferty, M I Polkey, J Moxham.   

Abstract

Twitch transdiaphragmatic pressure (Tw Pdi) measured with magnetic stimulation of the phrenic nerve is used to follow up patients and to assess the effect of clinical treatments on diaphragm function. However the reproducibility of Tw Pdi on different occasions has been little studied. We investigated 32 normal subjects, measuring Tw Pdi elicited by bilateral magnetic stimulation of the phrenic nerves on two to 14 occasions. Sniff transdiaphragmatic pressure (sniff Pdi) was also measured. The mean value of Tw Pdi and sniff Pdi were 28+/-5 and 134+/-24 cm H(2)O, respectively. The within subjects coefficient of variation was 11% for both Tw Pdi and sniff Pdi. We conclude that there is a variability of Tw Pdi and the variability of Tw Pdi is the same as that of sniff Pdi. Copyright 2002 Elsevier Science B.V.

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Year:  2002        PMID： 12208088     DOI： 10.1016/s1569-9048(02)00115-5

Source DB:  PubMed          Journal:  Respir Physiol Neurobiol        ISSN： 1569-9048            Impact factor:   1.931


  8 in total

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