Capnography traces. a) A good-quality trace showing a clear plateau that will ensure an accurate measurement of ETCO2. b) A trace from a patient with airflow.

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Physiology Lab Spirometry

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Presentation transcript:

Capnography traces. a) A good-quality trace showing a clear plateau that will ensure an accurate measurement of ETCO2. b) A trace from a patient with airflow obstruction (forced expiratory volume in 1 s 40% predicted). c) A trace from a patient with chronic... Capnography traces. a) A good-quality trace showing a clear plateau that will ensure an accurate measurement of ETCO2. b) A trace from a patient with airflow obstruction (forced expiratory volume in 1 s 40% predicted). c) A trace from a patient with chronic hyperventilation. This trace is less than technically ideal, as there is no clear plateau, meaning that ETCO2 may be underestimated. Andrew Robson Breathe 2017;13:45-50 ©2017 by European Respiratory Society