Optimizing the use of mechanical ventilation and minimizing its requirement with capnography
© Cambridge University Press 2004, 2011. Optimizing mechanical ventilation This chapter focuses on the use of capnography to optimize and minimize the length of mechanical ventilation. The sophistication of modern mechanical ventilators enables clinicians with a myriad of options for providing mechanical ventilation. Clinicians can individualize ventilatory strategies to meet specific patient needs. No one would dispute the fact that these ventilatory options have greatly enhanced the delivery of mechanical ventilation; however, the complexity of some of the newer ventilatory parameters makes monitoring of the cardiorespiratory status of critically ill patients even more crucial. Continuous monitoring of capnography provides clinicians with instant feedback on the effects of ventilatory choices. Capnography can also provide continuous monitoring for potentially life-threatening situations. Advances in capnography Time-based capnometry is most commonly referred to as end-tidal carbon dioxide(et CO2) monitoring. Capnography, when used without qualification, refers to time-based values displayed over time. Volume-based capnography (i.e., volumetric capnography) uses a combination of a CO2 sensor and a pneumotachometer, and graphically displays CO2 elimination in relation to the exhaled volume of gas. This permits the calculation of the net quantity of CO2 expired by the subject (i.e., the difference between expired and inspired CO2, although normally inspired CO2 is negligible), and is expressed as a volume of gas rather than a partial pressure or gas fraction.
- Capnography, Second Edition
Start / End Page
International Standard Book Number 13 (ISBN-13)
Digital Object Identifier (DOI)