These numeric measurements and graphic depictions, known as waveforms, depict how well a patient’s cells are using the oxygen in the system and how well they are eliminating the resulting carbon dioxide from the system. Now, with capnography, a patient’s level of function can be evaluated by measuring their exhaled carbon dioxide gases. Pulse oximetry does not inform on how the body is using the oxygen that has been delivered. Physicians, nurses, and paramedics have been using pulse oximetry for a long time to measure how well oxygen is being delivered to the cells and tissue.
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