|Clinical Degree of Intoxication||Symptoms|
|I - Mild||Headache, vomiting, tachycardia, no disturbances of consciousness|
|II - Moderate||Disturbances or loss of consciousness without other neurological symptoms, tachycardia, nocioceptive reflexes still intact|
|III - Severe||Loss of consciousness, intense muscular tonus, pathological neurological symptoms, tachycardia and tachypnea, circulatory and respiratory disturbances not observed|
|IV - Very Severe||Loss of consciousness, clinical signs of central nervous system damage, circulatory and respiratory disturbances|
(From: Jain, K.K. 1990, Carbon Monoxide Poisoning, Warren H. Green, Inc., St. Louis, MO)
Comment: Many many different classifications of severity of CO poisoning are in existence. Just as COHb level does not correlate well with short-term symptomatology or with the longterm effects, the symptoms and effects of CO poisoning do not fit easily into discrete classes as the above suggests. This table is presented as just one possible approach to classification of the effects of CO poisoning, but not necessarily one embraced by the website writer.
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