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Capnogram artifact due to water trap

Capnogram artifact due to water trap
Capnograms during mechanical ventilation. The endotracheal tube was partially obstructed and peak pressure in the circuit was 50 cm H20. The waveforms indicate a brief expiration during mechanical inspiration.
PCO2: partial pressure of carbon dioxide; H2O: water.
From: van Genderingen HR, Gravenstein N. Capnogram artifact during high airway pressures caused by water trap. Anesth analg 1987; 66:185. Copyright © 1987 International Anesthesia Research Society. Reproduced with permission from Lippincott Williams & Wilkins. Unauthorized reproduction of this material is prohibited.
Graphic 114793 Version 2.0