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Normal CO2 waveform

Normal CO2 waveform
A - B: Dead space ventilation
B - C: Ascending expiratory phase
C - D: Alveolar Plateau
D: End-tidal CO2
D - E: Descending inspiratory phase
Reproduced with permission from: Krauss B, Deykin A, Lam A, et al. Capnogram shape in obstructive lung disease. Anesth Analg 2005; 100:884. Copyright © 2005 Lippincott Williams & Wilkins.
Graphic 67700 Version 11.0