[Suicide case of carbon dioxide poisoning using dry ice].

We had a suicide case suspected to result in death from carbon dioxide poisoning by dry ice in the car. A clay cooking stove with charcoal was in the car, but the charcoal had no burning sign. CO hemoglobin saturation degree of the suicide victim's blood was 0%. Moreover, there were signs that 50 kg of dry ice was brought in the car. To clarify the cause of death, reproducibility testing was carried out by using a car under the same conditions. CO2 concentration in it increased to 22% and O2 concentration decreased to 16% within 20 minutes. From these observations, his death was considered to be caused by hypoxia and CO2 narcosis. CO2 in the suicide victim's blood was higher than those in the blood of healthy persons, and the same range was visible in the blood of fire victims. These data might support above supposition concerned with the cause of death. Blood analysis will be helpful in clearing the cause of death by CO2 poisoning.