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The reservoir bag is primarily used to assist in patient breathing during nitrous oxide sedation. While it can also serve other purposes, its main function is to provide a constant source of gas for the patient, ensuring that they receive an adequate supply of nitrous oxide and oxygen. When a patient inhales, the reservoir bag collapses slightly, providing the necessary gases to the patient's lungs. If the bag deflates too much, it indicates that the patient may need assistance with their breathing, as it reflects the volume of air being drawn in. This helps maintain a stable and comfortable level of sedation throughout the procedure.

Other functions, such as monitoring gas levels or regulating flow rate, are usually managed by other components of the delivery system, making the reservoir bag primarily a support tool for patient respiration during nitrous oxide sedation.