Figure 2From: Successful treatment of methemoglobinemia in an elderly couple with severe cyanosis: two case reports The concentrations of methemoglobin over the first 15 h after sodium nitrite intake. * Represents the time at measurement of methemoglobin level (<1 h) while the patients were in the department of emergency medicine. ** Represents the timing of intravenous methylene blue infusion.Back to article page