Higher concentrations cause rapid circulatory in- sufficiency leading to a coma and death.
CO2 is the most powerful cerebral vasodilator known. Persons in ill health where such illness would be aggravated by exposure to gaseous carbon dioxide should not be allowed to work with or handle this product. If unconscious, provide assisted respiration and supplemental oxygen. Further treatment should be symptomatic and supportive. Self-contained breathing apparatus should be available for rescue personnel.