Tufts University

Prior to blood gases, a 24-28% Venturi mask aiming for oxygen saturation of 88-92% is appropriate for patients with risk factors for hypercapnia but no prior history of respiratory acidosis. Occasionally, patients with normal PaCO2 , and no history or risk of hypercapnia, can initially elevate PaCO2 when given oxygen, though rarely to a ... ................
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