title: US states consider execution by nitrogen gas as lethal injections grind to a halt.
authors: Montreal.
authors: Owen
authors: O
authors: Dyer
mesh_terms: D002203:Capital Punishment / Q000331:legislation & jurisprudence / Q000379:methods*; D006801:Humans; D006993:Hypnotics and Sedatives; D000860:Hypoxia / Q000139:chemically induced*; D008874:Midazolam; D009584:Nitrogen; D010424:Pentobarbital; D014481:United States
chemical_list: D006993:Hypnotics and Sedatives; D010424:Pentobarbital; D009584:Nitrogen; D008874:Midazolam