Left shift of oxyhemoglobin dissociation curve impairs tissue oxygen delivery
Cellular toxicity
Mitochondrial dysfunction and impaired oxidative phosphorylation
Oxidative stress and inflammatory cascades contributing to delayed neurologic sequelae
Target organs
Brain vulnerability to hypoxia
Myocardial vulnerability to hypoxia and dysrhythmia
Therapeutic Considerations
Oxygen kinetics
Carboxyhemoglobin half life approximations
Room air several hours
100% oxygen about 60 to 90 minutes
Hyperbaric oxygen markedly shorter
Treatment rationale
Rapid displacement of CO from hemoglobin
Increased dissolved oxygen in plasma
Hyperbaric oxygen evidence summary
Faster CO elimination than normobaric oxygen
Potential reduction in delayed neurologic sequelae suggested in some studies
Trial and meta analysis results mixed
Guideline support for use in selected patients with severe features
Patient Discharge Instructions
Copy discharge instructions
Carbon monoxide exposure aftercare
Do not return to the exposure site until it is declared safe by qualified services
Arrange inspection and repair of suspected source
Install and test carbon monoxide detectors
Avoid using generators, grills, or fuel burning heaters indoors
Medication and symptom plan
Hydration and rest
Avoid alcohol and sedatives for 24 hours
Return to emergency care immediately for
Chest pain
Shortness of breath
Confusion or unusual behavior
New weakness, trouble walking, or vision changes
Severe headache or persistent vomiting
Fainting or seizure
Follow up
Primary care follow up within 24 to 72 hours
Neurology follow up if any cognitive or neurologic symptoms recur
Pregnancy specific follow up with obstetrics
References
Clinical guidelines and society statements
Guideline sources
CDC Clinical Guidance for Carbon Monoxide Poisoning updated July 8 2024
ACEP Clinical Policy on Acute Carbon Monoxide Poisoning 2017 Level B recommendation
Undersea and Hyperbaric Medical Society Carbon Monoxide Poisoning indications and resources
Ontario Poison Centre Carbon Monoxide protocol December 2024
Evidence based reviews and coding systems
Evidence and reviews
StatPearls Carbon Monoxide Toxicity updated April 19 2025
Emergency Care BC Carbon Monoxide Toxicity Treatment summary October 27 2020
Medical coding alignment
ICD 10 CM category T58 Toxic effect of carbon monoxide
SNOMED CT 17383000 Toxic effect of carbon monoxide
Build spec reference
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