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The best choice for this client is oxygen during an exacerbation of COPD.During a COPD exacerbation, treat patients with hypercapnia 24% or 28% oxygen through a Venturi facemask to maintain an oxygen saturation of > 90%. Titrate the oxygen concentration upwardly in individuals who do not have hypercapnia to keep the saturation above 90%.COPD damage can sometimes prevent the little air sacs in your lungs, known as alveoli, from receiving adequate oxygen. This is known as alveolar hypoxia. This type of hypoxia can set off a chain reaction that results in low oxygen levels in your blood, also known as hypoxemia. Hypoxemia is a major cause of COPD-related shortness of breath.To learn more about COPD damage visit:https://brainly.com/question/28420811#SPJ9