A flight paramedic is managing a 68-year-old male with severe COPD exacerbation. Despite aggressive bronchodilator therapy and BiPAP, the patient's mental status is declining, and his capnography waveform shows a pronounced 'shark-fin' appearance. What is the most likely indication for this waveform morphology?
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A
Bronchospasm
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B
Esophageal intubation
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C
Hypoventilation
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D
Rebreathing of CO2