• T Hildebrandt, M Espelund, and K S Olsen.
• Department of Anaesthesia and Intensive Care, Glostrup Hospital, University of Copenhagen, Denmark. vonhildebrandt@yahoo.dk
• Anaesthesia. 2010 Oct 1; 65 (10): 1017-21.

AbstractWe compared a small and transportable Capnometer (EMMA™) with a reference capnometer, the Siesta i TS Anaesthesia. During air-breathing through a facemask, both the EMMA (nine modules) and reference capnometer sampled expired gas simultaneously. A wide range of end-tidal carbon dioxide values were obtained during inhalation of carbon dioxide and voluntary hyperventilation. The median IQR [range] difference between all sets of carbon dioxide values (EMMA - reference) was -0.3 (-0.6 to 0.0 [-1.7 to 1.6] kPa; n = 297) using new batteries, which was statistically significant (p = 0.04) and located to two of the nine EMMAs tested. Using batteries with reduced voltage did not influence the measurements. The 95% CI of the medians of the differences were -0.4 to -0.2. We conclude that the EMMA can slightly under-read the end-tidal carbon dioxide but is generally comparable with a free-standing monitor. The precision of the EMMAs was similar whether new batteries or batteries with reduced voltage were used.© 2010 The Authors Anaesthesia © 2010 The Association of Anaesthetists of Great Britain and Ireland.

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