Related Experiment Video
Updated: Aug 1, 2026

Expired CO2 Measurement in Intubated or Spontaneously Breathing Patients from the Emergency Department
Published on: January 29, 2011
Hypercapnia related to a faulty adult co-axial breathing circuit
W S Jellish1, T Nolan, B Kleinman
1Department of Anesthesiology, Loyola University Medical Center, Maywood, Illinois 60153, USA.
Implications:
This report describes the appearance of CO2 on the capnograph during inspiration, which was linked to disconnection of the inner tube of a coaxial circuit extension piece. The increased use of coaxial breathing systems for adults makes inner tubes disconnections an important consideration when the CO2 appears during inspiration.
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