Her condition kept blood from tissue
Warren diagnosed her with "acquired methemoglobinemia," a reaction caused by certain medicines that stops blood from carrying oxygen to tissue, he said.
Oxygen-rich blood is typically associated with a bright-red color. But even though blood appears blue in patients with methemoglobinemia, oxygen levels are actually quite high, Warren said.
Blood "selfishly binds" with oxygen and doesn't release it to the tissue where it's needed. And thus, the patient appears blue.
It's fitting that the antidote is a brilliant blue, too. Methylene blue returns a missing electron to the hemoglobin molecule that restores oxygen levels and helps release oxygen back into tissue, he said.
"In my field, emergency medicine, when you can cure a patient with a single antidote--that's a rare thing for us," he said.
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