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Methemoglobinemia

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Updated 2023 AHA guidelines for the management of methemoglobinemia.

Guidelines

Key sources

The following summarized guidelines for the evaluation and management of methemoglobinemia are prepared by our editorial team based on guidelines from the American Heart Association (AHA 2023) and the European Hematology Association (EHA 2021). ...
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Screening and diagnosis

Screening of family relatives: as per EHA 2021 guidelines, test first-degree relatives of patients with hereditary methemoglobinemia.
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Diagnostic investigations

Clinical assessment
As per EHA 2021 guidelines:
Assess clinical findings and elicit family history to distinguish acquired from inherited forms of methemoglobinemia.
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Recognize the neurologic and cardiac symptoms and their progression with increasing methemoglobin.
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More topics in this section

  • Methemoglobin levels

  • Testing for NADH-cytochrome b5 reductase deficiency

  • Testing for G6PD deficiency

Respiratory support

Oxygen supplementation: as per EHA 2021 guidelines, administer oxygen supplementation if needed in minimally symptomatic or asymptomatic patients. Obtain routine monitoring of oxygen saturation with pulse oximetry in case oxygen is initiated, at least in neonates.
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  • Hyperbaric oxygen therapy

Medical management

General principles: as per EHA 2021 guidelines, manage methemoglobinemia in pediatric patients based on the symptoms, level of methemoglobin, cause of methemoglobinemia, and patient's age.
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  • Methylene blue

  • Ascorbic acid

  • N-acetylcysteine

Therapeutic procedures

Exchange transfusion: as per AHA 2023 guidelines, consider performing exchange transfusion in patients with methemoglobinemia not responding to methylene blue.
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  • Therapeutic phlebotomy

Perioperative care

Perioperative care: as per EHA 2021 guidelines, identify potential precipitating and exacerbating factors before surgery.
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Specific circumstances

Pregnant patients: as per EHA 2021 guidelines, ensure a multidisciplinary decision for methylene blue treatment during pregnancy and discussed with the patient weighing the risk of hypoxia on the fetus and the teratogenic and other effects of methylene blue.
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Patient education

General counseling: as per EHA 2021 guidelines, advise avoiding precipitating factors in patients with known hereditary or acquired methemoglobinemia and in patients with a CYB5R3 heterozygous variant.
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Follow-up and surveillance

Indications for referral: as per EHA 2021 guidelines, refer patients with mild symptoms to specialized laboratories or directly to emergency units in case of more severe symptoms to establish methemoglobin levels and initiate treatment.
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