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The Relative Accuracy of Three Transcutaneous Dual Electrodes at 45 °C in Adults

  • Colm Lanigan
  • Jose Ponté
  • John Moxham
Part of the Advances in Experimental Medicine and Biology book series (ABBI, volume 7)

Abstract

Conventional practice dictates that the results of any study comparing transcutaneous partial pressures of oxygen and carbon dioxide (tcPo2 and tcPCo2) with arterial blood gas values (PaO2 and PaCo2) should be presented in the form of a scattergram (Fig. 1). The relationship between the two is usually represented by a linear regression equation of the form
$$ {\rm{y}}({\rm{tcP}}{{\rm{O}}_2}) = {\rm{a}} + {\rm{bx}}({\rm{Pa}}{{\rm{O}}_2}) $$
and a correlation coefficient, r, calculated (Godfrey, I985). The probability that the transcutaneous and arterial blood gas values are related is given by a probability value, P (Table I). Does this statistical analysis give us the most useful information from transcutaneous monitoring for clinical purposes? We suggest that a recently proposed alternative method of analysis (Bland and Altman, I986) may be more useful and we demonstrate its practical application in evaluating combined tcPo2 and tcPCo2 electrodes against endtidal oxygen and carbon dioxide (ETPO2 and ETPCO2) values in normal adults.

Keywords

Linear Regression Equation Dual Electrode Transcutaneous Monitoring Transcutaneous Partial Pressure Transcutaneous Electrode 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Bland, J.M., and Altman, D.G., Statistical methods for assessing agreement between two methods of clinical measurement, Lancet, 1: 307 (1986).CrossRefGoogle Scholar
  2. Gardner, M.J., and D.G. Altman, Confidence intervals rather than P values: estimation rather than hypothesis testing, Br. Med. J., 1986, 292:746.CrossRefGoogle Scholar
  3. Godfrey, K., (1985), Simple linear regression in medical research, N Engl J Med, 313: 1629.CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • Colm Lanigan
    • 1
  • Jose Ponté
    • 1
  • John Moxham
    • 1
  1. 1.Departments of Thoracic Medicine and AnaesthesiaKing’s College HospitalLondonUK

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