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Capnography devices utilize a chemical probe that measures the level of expired carbon dioxide (ETCO₂) and can be used to monitor respirations. It is typically utilized in conjunction with a nose mask or nasal hood or nasal cannula. This “open” system can lead to limitations in its usefulness if a patient is breathing through their mouth instead of through the nose. It can be extremely useful, however, as it provides a measure of tidal volume, respiratory rate, and respiratory depth. While it does not provide an estimate of blood oxygen saturation, it is more sensitive than pulse oximetry for detecting respiratory depression and apnea.