The capnography extension uses infrared absorption spectroscopy to continuously measure CO? values. Designed to work with IntelliVue patient monitors and racks, the capnography extension provides CO? waveform and numeric values, plus temperature and 2 invasive pressure measurements on the IntelliVue patient monitor display. A digital signal processor located in the sensor measures either sidestream or mainstream etCO? and awRR for patients in surgery, in critical care, and during transport.