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Abstract
Methemoglobinemia (MetHb) is a clinical and laboratory syndrome characterized by an increase in the amount of methemoglobin in the blood and is usually manifested by central cyanosis caused by a decrease in oxygen delivery to tissues. MetHb is a diagnosis of exclusion because the diagnostic possibilities can be difficult due to the high variability in clinical manifestations (from asymptomatic to fatal) and the need for laboratory confirmation. Authors present the classification, pathophysiological mechanisms of MetHb and methods of treatment. A clinical case observation of a severe acquired MetHb in a child in connection with the intake of benzocaine contained in the ointment is presented as well: the timely diagnosis and treatment have led to stop the manifestations of MetHb.
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