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Some places will use a cutoff value of COHgb to determine need for HBO therapy, while others use symptoms to guide treatment. Symptoms are not predictably consistent at COHgb ranges from 20-60%. We only consider HBO in CO poisoning where the patient is comatose. Even then, there is a serious lack of literature demonstrating any benefit of HBO therapy. The criteria for this are getting narrower and narrower, and unless someone publishes a study showing that it changes outcomes, HBO may go away for this indication.
I apologize that I didn't exactly answer your question.
'zilla
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You may find me one day dead in a ditch somewhere. But by God, you'll find me in a pile of brass. -Tpr. M. Padgett
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