10.6.2 Use of bubble humidification systems Humidified oxygen is widely administered in hospitals across the UK and this is presumed to alleviate nasal and oral discomfort in the non-intubated patient. Humidification of supplemental oxygen is commonly delivered by bubbling oxygen through either cold or warm sterile water before it reaches the patient. However, the effect on patient comfort is negligible. Bubble humidifiers may, however, represent an infection hazard and should not be used.
There is no evidence of a clinically significant benefit from “bubble bottle” systems but there is an nfection risk.[Evidence level III]
——Guideline for emergency oxygen use in adult patients
British Thoracic Society Emergency Oxygen Guideline Group
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