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Canadian Journal of Anesthesia 50:754 (2003)
© Canadian Anesthesiologists' Society, 2003

Correspondence

Abnormal end-tidal CO2 waveforms

Jonathan L. Benumof, MD

San Diego, California

To the Editor:

The publication of the letter "A bizarre end-tidal carbon dioxide waveform"1 now represents the third discovery of the relationship between a loosely fitting distal end of a CO2 sampling line and a biphasic capnograph.2,3 Indeed, the relationship between the degree of loose fit of the sampling line and degree of abnormality of waveform has been quantitatively studied.4 The present publication of the relationship underscores the fact that some clinical lessons need to be and should be relearned.

References

1 Apuya JS, Kanter G. A bizarre end-tidal carbon dioxide waveform (Letter). Can J Anesth 2002; 49:1098–9.[Free Full Text]

2 Martin M, Zupan J, Benumof JL. Unusual end-tidal CO2 waveform (Letter). Anesthesiology 1987; 66: 712–3.[Medline]

3 Sampson I. An unusual capnograph tracing. J Cardiothoracic Vasc Anesth 1994; 8: 243–5.[Medline]

4 Zupan J, Martin M, Benumof JL. End-tidal CO2 excretion waveform and error with gas sampling line leak. Anesth Analg 1988; 67: 579–81.[Free Full Text]





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