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Review Question - QID 219986

QID 219986 (Type "219986" in App Search)
A 50-year-old man undergoes an arthroscopic shoulder surgery to repair a large right supraspinatus tear. Preoperatively, he received a supraclavicular nerve block by the anesthesiologist with bupivacaine, and also underwent general endotracheal anesthesia with video laryngoscopy. During the case, his vital signs remained stable. Postoperatively, he complains of moderate dyspnea in the recovery unit and is started on supplemental oxygen by nasal cannula for decreased blood oxygen saturation. Chest X-ray reveals no abnormal findings. What is the most likely etiology of his dyspnea?