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[Patent blue-induced false-methemoglobinemia]
M Hayakawa1, Y Morimoto, O Kemmotsu
1Department of Anesthesiology and Intensive Care, Hokkaido University School of Medicine, Sapporo.
Masui. the Japanese Journal of Anesthesiology
|August 10, 2000
Summary
Patent blue dye can interfere with pulse oximetry readings, mimicking methemoglobinemia. Anesthesiologists must understand monitor principles to avoid misinterpreting oxygen saturation changes.
Area of Science:
- Anesthesiology
- Medical Device Technology
Background:
- Hypotensive anesthesia using nitroglycerin infusion during mastectomy.
- Use of patent blue dye for surgical localization.
Observation:
- Sudden decrease in finger pulse oximeter oxygen saturation from 100% to 90%.
- Blood gas analysis confirmed decreased oxygen saturation and increased methemoglobin levels.
Findings:
- Initial diagnosis of nitroglycerin-induced methemoglobinemia was suspected.
- Inconsistent findings led to the conclusion that patent blue dye interfered with pulse oximetry.
- The patient experienced no adverse effects, suggesting a monitoring artifact.
Implications:
- Highlights the critical need for anesthesiologists to understand the operating principles of hematological monitoring devices.
- Emphasizes the importance of critically evaluating monitor data in conjunction with clinical presentation.
- Underscores potential interference of dyes with pulse oximetry, necessitating careful interpretation of results.