Why did this woman's blood turn blue? A common numbing medicine is to blame.

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Why did this woman's blood turn blue? A common numbing medicine is to blame.
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'I'm weak and I'm blue,' the woman told ER doctors.

A 25-year-old woman in Rhode Island gave new meaning to the phrase “feeling blue” when she developed a rare and sometimes fatal condition called methemoglobinemia that turned her blood a deep shade of navy blue., told doctors that she had used a topical pain reliever for a toothache.“I’m weak and I’m blue,” she told emergency room doctors, according to Dr. Otis Warren, an ER physician at Miriam Hospital in Rhode Island who treated the woman and wrote the case report.

Blood from the woman's artery and vein . Blood from the arteries is usually bright red, while blood from the veins is a darker shade of red.Her blood had also taken on a dark blue appearance. While blood drawn from a vein typically takes on a darker appearance because it isn't carrying oxygen, blood drawn from an artery should appear bright red. In the woman’s case, blood from her veins and arteries were dark blue.

The diagnosis prompted Warren to take a more precise measurement of the woman's blood oxygen level, which showed that it was in fact much lower, at 67 percent. At this level, tissue damage can occur. Methemoglobinemia is easily treatable, using a medication that, perhaps ironically, is called methylene blue. The woman was given the drug intravenously, and within minutes reported feeling better. Still, she was given a second dose and spent the night in the hospital for observation before being sent home the next morning with a referral to a dentist.

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