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Discussion Starter · #1 ·
A 62 year old man complains of severe headache, dizziness, nausea and deterioration of vision. On investigations, he has a decrease in oxygen carrying capacity with no change in PO2 of arterial blood.
Which of the following is most likely responsible for this patient's symptoms?
A- Ozone
B- Carbon monoxide (CO)
C- Sulfur dioxide
D- Nitrogen
Answer: http://medical-usmle.com/?p=1278
 
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