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A 56-year-old man undergoes a laryngoscopy. Due to a strong gag reflex, extra doses of benzocaine (Hurricaine) spray are used. The patient tolerated the procedure well, but while waiting for his wife to pick him up, he started to have cyanosis around the lips. On exam, the patient has a bluish discoloration of his lips and fingertips and is complaining of a headache. You administer oxygen by nasal canula with no improvement in his cyanosis. You draw venous blood for labs, and find that it has an unusual brownish discoloration.