Methylene Blue is the treatment of choice for symptomatic drug-induced methaemoglobinaemia (signs of hypoxia with chest pain, dyspnoea or confusion) or consider in asymptomatic patients with methaemoglobin (MetHb) levels >20%.
CLASS heterocyclic aromatic molecule MECHANISM OF ACTION two opposite actions on Hb (1) low concentrations: methylene blue -> NADPH-dependent reduction to leucomethylene blue (due to action of methaemoglobin reductase) -> reduces methaemoglobin -> Hb(2) high concentrations: methylene blue -> converts…
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