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AbstractMethemoglobinemia is a state recognized by the increased production of met-hemoglobin, which is a form of oxidized hemoglobin, which is unable to bind oxygen. As a result the patient has a functional anemia, in which the remaining oxyhemoglobin has increased oxygen affinity, shifting the oxygen curve to left and perpetuating the impairment of oxygen delivery to tissues. Methemoglobinemia is a rare, but serious cause of hypoxemia, which can be difficult to recognize. It has beendoi:10.1055/s-0039-1678624 fatcat:4c3djdbjfzapfka4f7bria3fhi