Very useful with a Grade 3 view, not so much a grade 4 view unless you get lucky. Grade 3 with a bougie seems a lot easier to me then grade 3 with a stylet, but default at my institution is "grade 3, grab the bougie" so I'm likely biased. They both seem to go in either way these days. I do notice the feel of tracheal rings much more with the bougie (and I worry a little about tracheal damage doing that with a stylet).
And I'd second the blue sum-med ones that are single use. The multi use ones seem to get floppier with age and it becomes tough to feel tracheal rings to confirm placement.
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Airway bougies
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