Hyperbaric Oxygen Therapy for Carbon Monoxide Poisoning

What Is Carbon Monoxide Poisoning?

Carbon monoxide (CO) poisoning occurs when CO gas—an odorless, colorless byproduct of incomplete combustion—binds tightly to hemoglobin in red blood cells, preventing oxygen delivery to tissues. Even low levels can cause headache and confusion, while high exposures can lead to unconsciousness or death.

How Carbon Monoxide Affects Health

• Carboxyhemoglobin Formation: CO binds over 200× more strongly to hemoglobin than oxygen, reducing blood oxygen capacity.
• Cellular Hypoxia: Tissues, especially brain and heart, suffer oxygen deprivation leading to organ damage.
• Neurological Injury: Symptoms include headache, dizziness, cognitive impairment, and long-term neuropsychiatric sequelae.
• Cardiac Effects: Can trigger arrhythmias, myocardial ischemia, and increased risk of long-term heart disease.

Why HBOT Is Effective

HBOT is a first-line treatment for moderate to severe CO poisoning because it:

• Accelerates CO Elimination: High pressure and 100% oxygen reduce CO half-life from ~300 minutes to about 20 minutes.
• Restores Oxygen Delivery: Hyper-oxygenation ensures adequate tissue oxygenation despite CO presence.
• Reduces Oxidative Stress: Mitigates lipid peroxidation and cellular injury caused by reperfusion.
• Prevents Delayed Neurological Sequelae: Decreases risk of cognitive and motor deficits that can appear days to weeks after exposure.

Treatment Protocols

Standard HBOT protocols for CO poisoning often include:

• Pressure: 2.5 – 3.0 ATA
• Duration: 60 – 90 minutes per session
• Frequency: Typically 1–3 sessions within the first 24 hours, depending on severity

Who Should Consider HBOT?

• Patients with loss of consciousness or neurological symptoms after CO exposure
• Individuals with cardiac ischemia or elevated cardiac biomarkers due to CO
• Pregnant women exposed to CO (fetus is highly sensitive to hypoxia)
• Anyone with significant CO levels (>25% carboxyhemoglobin) measured in blood

*HBOT for CO poisoning should be administered in a medical hyperbaric facility under physician supervision. Seek emergency care immediately if CO poisoning is suspected.