ArticleCanadian journal of anaesthesia = Journal canadien d'anesthesie2025
Safer oxygenation through flexible optical scopes during airway management: an in vitro study.
Article in Canadian journal of anaesthesia = Journal canadien d'anesthesie, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
purposeOxygen insufflation through the working channel of flexible optical scopes improves oxygenation and visibility during tracheal intubation but potentially causes barotrauma when not pressure-restricted. Pressure limited to 30-40 cm H
methodsIn the present in vitro study, we constructed a setup with equipment readily available in anesthesia locations, allowing regulation of the pressure at which oxygen is delivered at the distal end of the flexible optical scope. Pressure was regulated via the adjustable pressure-limiting valve and measured by immersion in water. We identified which combinations of set flow from the anesthesia machine and set pressure resulted in distal pressures of 10, 15, 30, and 40 cm H
resultsIn flexible scopes with a channel diameter ≥ 2 mm, we obtained clinically relevant flows > 3 L·min
conclusionsOxygen insufflation through a flexible optical scope at a targeted distal pressure is possible with ubiquitous anesthesia equipment. Scopes with a suction-/working-channel diameter ≥ 2 mm delivered clinically relevant flows > 3 L·min
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