A post-anesthesia patient has a respiratory rate of 8 breaths/min and SpO2 of 88% on room air. After applying 6L/min oxygen via face mask, SpO2 rises to 94%. What is the most likely cause of initial hypoxemia?
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A
Hypoventilation from residual opioid effect
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B
Pulmonary embolism
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C
Pneumothorax
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D
Bronchospasm