I have used nonrebreather masks with high flow oxygen to treat
hyperventilation syndrome prior to giving vistaril or someother sedative..My
concern is not for the hypercarbia, which we want to induce to a mild degree
but rather the low inhaled oxygen when using a paper baag..ie expired air has
O2 content of about 16%, which for someone with vasospasm, tetany etc may not
be high enough to assure tissue perfusion.
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