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Respiratory monitoring 

Respiratory monitoring
Chapter:
Respiratory monitoring
Author(s):

Carl Waldmann

, Neil Soni

, and Andrew Rhodes

DOI:
10.1093/med/9780199229581.003.0006
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date: 05 May 2021

Pulmonary function tests in critical illness 90

End-tidal CO2 monitoring 92

Pulse oximetry 94

Pulmonary function test results in critically ill patients can be important prognostically and guide ventilatory and weaning strategies. However, they are not straightforward to measure in mechanically ventilated patients and remain limited to dynamic volumes. Fortunately, most modern mechanical ventilators are able to calculate and display static and dynamic lung volumes, together with derived values for airway resistance, compliance and flow/volume/time curves. The ability to monitor these changes after altering ventilatory parameters has enabled more sophisticated adjustments of ventilation, to prevent potentially damaging mechanical ventilation....

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