Methemoglobinemia

Methemoglobinemia is a hematologic disorder characterized by an abnormal accumulation of methemoglobin in circulating erythrocytes, leading to impaired systemic oxygen delivery and functional anemia Pathophysiologically, the condition occurs when heme iron is oxidized from its functional ferrous state to the ferric state, which prevents affected subunits from binding oxygen and shifts the oxygen dissociation curve of remaining normal hemoglobin to the left It can be congenital due to enzymatic d...

Methemoglobinemia is a hematologic disorder characterized by an abnormal accumulation of methemoglobin in circulating erythrocytes, leading to impaired systemic oxygen delivery and functional anemia

It can be congenital due to enzymatic deficiencies or hemoglobin mutations, but it most frequently arises as an acquired condition secondary to exposure to oxidizing drugs or toxins, with infants exhibiting heightened vulnerability

It can be congenital due to enzymatic deficiencies or hemoglobin mutations, but it most frequently arises as an acquired condition secondary to exposure to oxidizing drugs or toxins, with infants exhibiting heightened vulnerability

Characteristic clinical manifestations include central cyanosis that is refractory to supplemental oxygen, chocolate-brown discoloration of arterial blood, fatigue, and tissue hypoxia that can progress to cardiac arrhythmias, seizures, or death at severe levels