Editorial II: Deadspace: invasive or not?

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Editorial II: Deadspace: invasive or not? G.B. Drummond, R Fletcher British Journal of Anaesthesia Volume 96, Issue 1, Pages 4-7 (January 2006) DOI: 10.1093/bja/aei289 Copyright © 2006 British Journal of Anaesthesia Terms and Conditions

Fig 1 (A) The SBT-CO2 showing the three phases of the plot, airway deadspace (phase I), the interchange between airway and alveolar gas (phase II), and the sloping alveolar plateau (phase III). (B) Block diagrams exist to illustrate the different equations for deadspace. The volume of carbon dioxide exhaled in a single breath (shaded box) can be considered to be exhaled in a given volume of gas containing end tidal carbon dioxide, or a smaller volume containing gas equilibrated with arterial blood. In each case, the calculated deadspace is different. British Journal of Anaesthesia 2006 96, 4-7DOI: (10.1093/bja/aei289) Copyright © 2006 British Journal of Anaesthesia Terms and Conditions

Fig 2 The use of the cumulative exhaled carbon dioxide vs volume plot to estimate airway deadspace. British Journal of Anaesthesia 2006 96, 4-7DOI: (10.1093/bja/aei289) Copyright © 2006 British Journal of Anaesthesia Terms and Conditions

Fig 3 Using of the slope of the alveolar plateau to estimate the efficiency of carbon dioxide elimination, by the Koulouris8 or Romero10 methods. British Journal of Anaesthesia 2006 96, 4-7DOI: (10.1093/bja/aei289) Copyright © 2006 British Journal of Anaesthesia Terms and Conditions