Clinical GradeFDA Cleared
For Wound Care
Perry Baromedical
Multiplace Series
Hard-Shell Multiplace·2-18+ person
Pressure3 ATA
$150,000 - $400,000+
FDA-Approved Indication●●●●Strong Evidence
Hyperbaric Therapy for Carbon Monoxide Poisoning
One of the original and most established FDA-approved indications for HBOT — an emergency medicine standard.
Key Takeaways
- HBOT reduces carboxyhemoglobin half-life from 5 hours (room air) to 20–25 minutes (at 3.0 ATA).
- Weaver et al. (2002) NEJM study showed HBOT significantly reduced cognitive sequelae after CO poisoning.
- CO poisoning is one of 14 FDA-approved indications for HBOT — covered by insurance.
- CO kills 400+ Americans and sends 50,000+ to emergency departments annually.
- Delayed neurological sequelae (DNS) affects 15–40% of CO poisoning patients and HBOT significantly reduces this risk.
- Emergency protocol: treatment within 6 hours is optimal, within 24 hours is recommended.
What is Carbon Monoxide Poisoning?
Carbon monoxide (CO) poisoning kills more than 400 Americans and sends over 50,000 to emergency departments each year. CO binds to hemoglobin 200–250 times more strongly than oxygen, displacing it and causing tissue hypoxia throughout the body — particularly affecting the brain and heart. At normal atmospheric pressure, the half-life of carboxyhemoglobin (CO-bound hemoglobin) is approximately 5 hours. Breathing 100% oxygen at 1.0 ATA reduces this to about 80 minutes. HBOT at 2.5–3.0 ATA reduces it to approximately 20–25 minutes, making hyperbaric oxygen the fastest way to clear CO from the blood and restore tissue oxygenation.
How Hyperbaric Therapy Helps Carbon Monoxide Poisoning
HBOT works against CO poisoning through multiple mechanisms. The primary effect is accelerated CO elimination: at 3.0 ATA, the half-life of carboxyhemoglobin drops from 5 hours (room air) to 20–25 minutes. But the benefit goes beyond CO clearance. HBOT directly oxygenates tissues via dissolved plasma oxygen, bypassing the blocked hemoglobin entirely. It reduces cerebral edema, inhibits lipid peroxidation in the brain, prevents the delayed neurological sequelae (DNS) that can occur days to weeks after exposure, and reduces the inflammatory cascade triggered by reperfusion injury when oxygen returns to previously hypoxic tissues.
Recommended Protocol
Pressure
2.5–3.0 ATA
Sessions
1–3 sessions (emergency)
Duration
90–120 minutes per session
What Does the Evidence Say?
●●●●Strong Evidence
Carbon monoxide poisoning was one of the earliest applications of HBOT and has the longest evidence history. The Weaver et al. (2002) landmark RCT in the New England Journal of Medicine demonstrated that HBOT significantly reduced cognitive sequelae at 6 weeks and 12 months after CO poisoning compared to normobaric oxygen alone. The UHMS recommends HBOT for CO poisoning as a primary indication. Current emergency medicine guidelines include HBOT for severe CO poisoning (loss of consciousness, cardiac involvement, neurological symptoms, or COHb >25%). The evidence is strong and well-established.
FDA-Approved Indication
Carbon Monoxide Poisoning is one of the 14 conditions for which the FDA has approved hyperbaric oxygen therapy. Insurance coverage may be available with a physician prescription and treatment in an accredited facility.
Recommended Chambers for Carbon Monoxide Poisoning
Based on the protocol requirements — minimum 2.5 ATA, Clinical Grade tier. Sorted by clinical credibility score.
Clinical GradeFDA Cleared
For Wound Care
Perry Baromedical
Sigma 34
Hard-Shell Monoplace·1-person
Pressure3 ATA
$50,000 - $90,000
Clinical GradeFDA Cleared
For Wound Care
Perry Baromedical
Sigma 36
Hard-Shell Monoplace·1-person
Pressure3 ATA
$55,000 - $95,000
Clinical GradeFDA Cleared
For Maximum Comfort
Perry Baromedical
Sigma 40
Hard-Shell Monoplace·1-person
Pressure3 ATA
$65,000 - $110,000
Clinical GradeFDA Cleared
For Wound Care
Perry Baromedical
Sigma 40-II
Hard-Shell Multiplace·2-person
Pressure3 ATA
$100,000 - $160,000
Clinical GradeFDA Cleared
For Wound Care
Perry Baromedical
Sigma Elite
Hard-Shell Monoplace·1-person
Pressure3 ATA
$80,000 - $130,000
Frequently Asked Questions
How quickly should HBOT be administered after CO poisoning?
As soon as possible. The greatest benefit is within the first 6 hours of exposure. Most emergency HBOT protocols aim for treatment within 24 hours. Delayed treatment (beyond 24 hours) may still reduce the risk of delayed neurological sequelae but is less effective than early treatment.
Does insurance cover HBOT for carbon monoxide poisoning?
Yes. CO poisoning is an FDA-approved indication and is covered by Medicare and most private insurers as emergency medical treatment. Treatment is typically administered at hospital-based hyperbaric facilities.
What is delayed neurological sequelae (DNS)?
DNS occurs in 15–40% of CO poisoning patients, appearing 2–40 days after the initial exposure. Symptoms include cognitive impairment, personality changes, movement disorders, and dementia-like presentation. HBOT has been shown to significantly reduce the incidence of DNS, which is one of the primary reasons for treating even mild-to-moderate CO poisoning with hyperbaric oxygen.
Related Conditions
Sources & References
- Weaver et al. (2002) — Hyperbaric oxygen for acute carbon monoxide poisoning, New England Journal of Medicine
- UHMS — Carbon Monoxide Poisoning indication
- CDC — Carbon Monoxide Poisoning Prevention
- Hampson et al. (2012) — Practice recommendations for CO poisoning, American Journal of Respiratory and Critical Care Medicine
Last updated: March 2026. Data sourced from manufacturer specifications, FDA databases, and published clinical research.
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