What is Methemoglobinemia?
Methemoglobinemia (congenital or acquired) occurs when red blood cells (RBCs) contain methemoglobin at levels higher than 1%. Methemoglobin results from the presence of iron in the ferric form instead of the usual ferrous form.This results in a decreased availability of oxygen to the tissues. Symptoms are proportional to the methemoglobin level . As levels rise above 15%, neurologic and cardiac symptoms arise as a consequence of hypoxia.
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