title: The time has come for evolution from the circle breathing system.
authors: Department of Anesthesia, Massachusetts General Hospital, Boston 02114.
authors: B A
authors: BA
authors: Simon
authors: M A
authors: MA
authors: Lovich
authors: N
authors: N
authors: Sims
authors: J B
authors: JB
authors: Cooper
mesh_terms: D000764:Anesthesia, Closed-Circuit / Q000295:instrumentation / Q000379:methods / Q000639:trends*; D000777:Anesthetics / Q000008:administration & dosage; D002245:Carbon Dioxide / Q000378:metabolism; D004867:Equipment Design; D004869:Equipment Safety; D005544:Forecasting; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D017053:Infection Control; D008991:Monitoring, Physiologic / Q000295:instrumentation; D012119:Respiration / Q000502:physiology; D012121:Respiration, Artificial
chemical_list: D000777:Anesthetics; D002245:Carbon Dioxide