A patient with carbon monoxide poisoning has a COHb level of 20%. If the patient is given 100% oxygen, what will the approximate COHb level be in 1 hour?
a. 15%
b. 10%
c. 5%
d. 2.5%
B
Breathing 100% oxygen at one atmosphere pressure will reduce the COHb by half in l hour. A 20% COHb level will be reduced to about 10% after 1 hour of breathing FIO2 1.0.
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