Overview
Delayed encephalopathy due to carbon monoxide poisoning (also called delayed neurological sequelae of carbon monoxide poisoning, or DNS) is a condition where a person appears to recover from carbon monoxide (CO) poisoning, only to develop serious brain and nervous system problems days to weeks later. Carbon monoxide is a colorless, odorless gas produced by burning fuels. When someone breathes in too much of it, the gas replaces oxygen in the blood and damages the brain. In delayed encephalopathy, there is a 'lucid interval' — a period of seeming recovery lasting anywhere from 2 to 40 days — before neurological symptoms suddenly appear. Symptoms can include confusion, memory loss, difficulty concentrating, personality changes, trouble walking, stiff or slow movements similar to Parkinson's disease, urinary incontinence, and sometimes mutism (inability to speak). The condition affects the white matter of the brain, which is the tissue that connects different brain regions. MRI scans often show characteristic damage to these white matter areas. Treatment focuses on supportive care and rehabilitation. Hyperbaric oxygen therapy (breathing pure oxygen in a pressurized chamber) is sometimes used, though its effectiveness for the delayed form is still debated. Many patients improve over months, but some are left with lasting cognitive or movement problems. Early recognition of carbon monoxide poisoning and prompt treatment may reduce the risk of developing this delayed condition.
Also known as:
Key symptoms:
Memory lossConfusion and disorientationDifficulty concentratingPersonality or behavior changesSlow, stiff movements similar to Parkinson's diseaseTrouble walking or poor balanceUrinary incontinenceInability to speak (mutism)Apathy or lack of motivationDepression or anxietyDifficulty performing daily tasksTremor or involuntary movementsIrritability or agitationSeizures in severe cases
Clinical phenotype terms (9)— hover any for plain English
Sporadic
Usually appears on its own, not inherited from a parent
Adult
Begins in adulthood (age 18 or older)
Treatments
No FDA-approved treatments are currently listed for Delayed encephalopathy due to carbon monoxide poisoning.
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Specialists
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Treatment Centers
8 centersBaylor College of Medicine Rare Disease Center ↗
Baylor College of Medicine
📍 Houston, TX
🏥 NORDStanford Medicine Rare Disease Center ↗
Stanford Medicine
📍 Stanford, CA
🔬 UDNNIH Clinical Center Undiagnosed Diseases Program ↗
National Institutes of Health
📍 Bethesda, MD
🔬 UDNUCLA UDN Clinical Site ↗
UCLA Health
📍 Los Angeles, CA
🔬 UDNBaylor College of Medicine UDN Clinical Site ↗
Baylor College of Medicine
📍 Houston, TX
🔬 UDNHarvard/MGH UDN Clinical Site ↗
Massachusetts General Hospital
📍 Boston, MA
🏥 NORDMayo Clinic Center for Individualized Medicine ↗
Mayo Clinic
📍 Rochester, MN
👤 Mayo Clinic Center for Individualized Medicine
🏥 NORDUCLA Rare Disease Day Program ↗
UCLA Health
📍 Los Angeles, CA
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Questions for your doctor
Bring these to your next appointment
- Q1.How severe is the brain damage shown on my MRI, and what does that mean for my recovery?,Would hyperbaric oxygen therapy be helpful in my case?,What rehabilitation services do you recommend, and how often should I attend?,What symptoms should prompt me to seek emergency care?,How long does recovery typically take, and what level of improvement can I expect?,Are there medications that could help with my specific symptoms?,When might I be able to return to work or driving?
Common questions about Delayed encephalopathy due to carbon monoxide poisoning
What is Delayed encephalopathy due to carbon monoxide poisoning?
Delayed encephalopathy due to carbon monoxide poisoning (also called delayed neurological sequelae of carbon monoxide poisoning, or DNS) is a condition where a person appears to recover from carbon monoxide (CO) poisoning, only to develop serious brain and nervous system problems days to weeks later. Carbon monoxide is a colorless, odorless gas produced by burning fuels. When someone breathes in too much of it, the gas replaces oxygen in the blood and damages the brain. In delayed encephalopathy, there is a 'lucid interval' — a period of seeming recovery lasting anywhere from 2 to 40 days — be
How is Delayed encephalopathy due to carbon monoxide poisoning inherited?
Delayed encephalopathy due to carbon monoxide poisoning follows a sporadic inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.
At what age does Delayed encephalopathy due to carbon monoxide poisoning typically begin?
Typical onset of Delayed encephalopathy due to carbon monoxide poisoning is adult. Age of onset can vary across affected individuals.