Pediatria polska
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Pediatr Pol
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Two cases of the congenital methemoglobinemia in children due to the deficiency of NADH-dependent methemoglobin reductase in erythrocytes. These children were referred to the Cardiological Ward at the Child Health Centre with suspected cyanotic heart defect. ⋯ Methylene blue and vitamin C diminished cyanosis. These cases advocate inclusion of methemoglobinemia into differential diagnosis of cyanotic disorders especially if there is no evident pathology in cardio-vascular system.