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Old 08-07-2015
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Default Remembered USMLE Question 934
You are the internist on call. Surgery department calls you for an emergency. One of the patients had surgery today and got a large dose of lidocaine and now she has tachycardia and discoloration of her skin and lips. On examination, she has rapid regular pulse and cyanosis. Further investigations reveal methemoglobinemia.
What is the mechanism of action of the drug used for this patient?
A- Oxidation reaction to convert Fe2 to Fe3
B- Reduction reaction to convert Fe3 to Fe2
C- Chelating of Fe3
D- Excretion of toxic substance
Answer: http://medical-usmle.com/repeated-usmle-questions-63
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