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Personally my first reaction/habit to any feeling of weirdness or inappropriate increased breathing rate is to exhale through my nose a few times and fire the adv. Aware now and sensitive of a possible issue I am ready to turn the bov (if im using one) or go to OC if the fresh gas doesnt show signs of illeviating the problem to a manageable level
In case of a O2 hit, would this not worsen the problem, by breathing the O2 rich gas allready present in the loop? I would guess that i need atleast one full breath before fresh gas from the ADV has found it's way to the dsv.