ArticleEnvironmental Gas Displacement: Three Accidental Deaths in the WorkplaceGill, James R. M.D.; Ely, Susan F. M.D., M.P.H.T.M.; Hua, Zhongxue M.D., Ph.D.Author Information From the New York City Office of Chief Medical Examiner and the Department of Forensic Medicine, New York University School of Medicine, New York, New York, U.S.A. Manuscript received April 24, 2001; accepted August 28, 2001. Address correspondence and reprint requests to James R. Gill, M.D., Office of Chief Medical Examiner, 520 First Avenue, New York, NY 10016, U.S.A. E-mail: Alzanolomb@aol.com The American Journal of Forensic Medicine and Pathology: March 2002 - Volume 23 - Issue 1 - p 26-30 Buy Abstract The authors describe three accidental deaths resulting from occupational hazards involving environmental gas alterations. One involved the displacement of oxygen caused by leakage of liquid nitrogen during the installation of a magnetic resonance imaging system. Two involved elevated environmental carbon dioxide concentrations: dry ice sublimation in a walk-in refrigerator in a research laboratory, and activation of a carbon dioxide fire alarm-extinguisher system by a woman locked in a bank vault. The autopsy findings, scene investigations, and certifications of these deaths, as related to the mechanisms of death, are discussed. © 2002 Lippincott Williams & Wilkins, Inc.