Related Experiment Videos
[Pulse oximetry and methemoglobinemia]
S Moretti1, P Jouvet, G Schleiermacher
1Service de réanimation pédiatrique, hôpital Necker-Enfants-Malades, Paris, France.
Summary
Cyanosis with low oxygen saturation and high PaO2 suggests methemoglobinemia, a hemoglobin pathology. This case highlights prilocaine-lignocaine cream as a potential cause, treatable with methylene blue.
Area of Science:
- Pediatric Hematology
- Toxicology
- Anesthesiology
Background:
- Cyanosis, often indicating low oxygen saturation, can signal underlying hemoglobin disorders.
- Methemoglobinemia is a condition where hemoglobin is oxidized, reducing oxygen-carrying capacity.
Observation:
- A 3-year-old child with nephroblastoma developed persistent cyanosis post-anesthesia.
- Despite pleural effusion drainage, oxygen saturation remained low with high arterial PaO2.
- The patient had partial G6PD deficiency, a risk factor for certain drug-induced conditions.
Findings:
- Methemoglobinemia was diagnosed as the cause of cyanosis.
- Prilocaine-lignocaine cream, used for local anesthesia, was identified as the causative agent.
- Treatment with methylene blue effectively resolved the methemoglobinemia.
Implications:
- Cyanosis with preserved or high PaO2 warrants investigation for methemoglobinemia.
- Awareness of anesthetic cream risks is crucial in pediatric patients, especially those with G6PD deficiency.
- Prompt diagnosis and methylene blue treatment are key for managing methemoglobinemia.