Why is the CO2 so high?

A 29 yo female presents with tachycardia and shortness of breath and some pleuritic chest pain. She has driven from interstate for the last 8 hours. Examination reveals vitals of: Heart rate of 108bpm sinus BP 105/68 Saturations of 87% on room air The physical examination is normal. The working diagnosis is a pulmonary embolism.…

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