In patients who are breathing, nasal prongs can be applied that capture exhaled air. Two sensors can be used to measure capnography. Changes in respiratory rate and tidal volume are displayed immediately as changes in the waveform and ETCO2. Capnography also measures and displays the respiratory rate. The capnograph is the waveform that shows how much CO2 is present at each phase of the respiratory cycle, and it normally has a rectangular shape. This is end-tidal CO2 (ETCO2) which is normally 35-45 mm Hg. The number is capnometry, which is the partial pressure of CO2 detected at the end of exhalation. Waveform capnography represents the amount of carbon dioxide (CO2) in exhaled air, which assesses ventilation. Capnography provides breath-to-breath ventilation data Here are five things you should know about waveform capnography.
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