Article Figures & Data
Figures
- Fig. 1.
Metabolic pathways for the reduction of methemoglobin. The major pathway for methemoglobin reduction is cytochrome b5 reductase. An alternative pathway that requires an exogenous electron acceptor (ie, methylene blue) is nicotinamide adenine dinucleotide phosphate (NADPH) methemoglobin reductase. A small amount of methemoglobin is reduced through a nonenzymatic pathway (dashed line).
- Fig. 2.
Extinction curves of 3 hemoglobin species. Oxyhemoglobin and reduced hemoglobin have different absorptions of 660-nm and 940-nm light waves. Methemoglobin has a similar absorption at the 2 wavelengths. The extinction coefficient is shown with a logarithmic scale.
