The patient is a 21 year old American Literature major who graduated from college this December. Upon graduating, he followed in the footsteps of his idol Thoreau and decided he wanted to "live simply" so he bought an old, rustic, wood-stove cabin in the woods. He was further inspired by the #Minimalist movement that he learned about on Netflix. After one week gathering and cooking his own food in the cabin he noticed that he had a persistent headache with occasional dizziness and confusion. He's never had these symptoms before so he decided to go to the nearby ED. In the ED, he is hypertensive, tachycardic and complaining of nausea. Which of the following is true?
A. You would expect to see a Rightward shift of hemoglobin dissociation curve
B. Half-life of CO with face mask is 90 minutes
C. Headache is the most common symptom
D. A common presenting sign is skin discoloration
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