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A workman wearing a chemical respirator was discovered unconscious in a tank car shortly after he had entered to clean it with the solvent, tetrachloroethylene. Infrared analysis of his breath revealed a high concentration of tetrachloroethylene and showed he had been exposed to an anesthetic vapor concentration inside his respirator. The analysis indicated the probable diagnosis from a long list of possible causes of unconsciousness. The brief, but acute vapor exposure caused mild chemical hepatitis over the next ten days.
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R. D. Stewart (1969) studied this question.
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