Here you go, JX, straight from a group of barristers who specialize in brain injury litigation......
From the Brain Injury Law Group:
"Carbon Monoxide Poisoning can be Subtle
The symptoms of carbon monoxide poisoning may not be as obvious as most people think. We commonly hear stories of the family that is overcome by a faulty furnace, found dead or in a coma. But less profound cases of carbon monoxide exposure can also result in severe disability or even death. Often times, the first symptoms of CO toxicity show up as flu like symptoms: headache, nausea, vomiting, dizziness and blurred vision. For this reason, exposure to CO can confused with flu, depression, chronic fatigue syndrome, and migraine or other headaches.
Delayed Onset of Severe Symptoms after Carbon Monoxide Poisoning
One of the most disturbing and unexpected aspects of carbon monoxide poisoning is the delayed onset of Neurological symptoms. Even more so than with other types of damage to the brain, this type of damage is an elongated process. Behavioral and neurological deficits can arise or worsen two to 40 days after the exposure. Often times a patient is discharged from the hospital after initial evaluation, to have a severe relapse of symptoms, from escalating pathology. The toxic effects of CO poisoning continue to attack the brain, for many weeks after the initial exposure. This syndrome, sometimes called DNS, can materialize as almost any neurological or behavioral symptom, including memory loss, confusion, seizures, urinary incontinence, loss of bowel function, disorientation, hallucinations, psychosis and balance and dizziness."
I would not use a lawsuit for reference because they will say and do anything for a buck so will their bought experts.