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Investigation of a Blue Light LED Device to Suppress Wound Pathogens Using a Collagen-Based Synthetic Skin Model
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Blue cures blue but be cautious.

Pranav Sikka1, V K Bindra, Seema Kapoor

  • 1Department of Pharmacology, LLRM Medical College, Muradnagar (Ghaziabad), India.

Journal of Pharmacy & Bioallied Sciences
|January 6, 2012
PubMed
Summary
This summary is machine-generated.

Methemoglobinemia treatment with methylene blue requires caution in patients with glucose-6-phosphate dehydrogenase deficiency. Insufficient NADPH in these patients hinders methylene blue

Keywords:
G6PD deficiencymethemoglobinemiamethylene blue

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Area of Science:

  • Hematology
  • Biochemistry
  • Pharmacology

Background:

  • Methemoglobinemia is a condition where methemoglobin levels exceed 1% of total hemoglobin.
  • Enzymatic systems, like nicotinamide adenine dinucleotide phosphate (NADPH) methemoglobin reductase, normally prevent methemoglobin accumulation.
  • Supplemental oxygen and intravenous methylene blue are standard treatments for methemoglobinemia.

Observation:

  • Methylene blue acts as an artificial electron acceptor, facilitating the reduction of methemoglobin via the NADPH-dependent methemoglobin reductase system.
  • Glucose-6-phosphate dehydrogenase (G6PD) is crucial for generating NADPH through the pentose phosphate pathway.
  • G6PD-deficient individuals exhibit reduced NADPH production, impairing the methylene blue activation pathway.

Findings:

  • Methylene blue efficacy is compromised in G6PD-deficient patients due to insufficient NADPH.
  • This deficiency represents a relative contraindication for methylene blue administration.
  • The reduction of methylene blue to its active leukomethylene blue form is significantly impaired.

Implications:

  • Careful consideration of G6PD status is essential before administering methylene blue for methemoglobinemia.
  • Assessing G6PD levels prior to treatment can prevent therapeutic failure and potential adverse events.
  • Alternative treatment strategies may be necessary for methemoglobinemia patients with known or suspected G6PD deficiency.