Distribution of waste anesthetic gases in the operating room air.
Piziali-RL; Whitcher-C; Sher-R; Moffat-RJ
Anesthesiology 1976 Nov; 45(5):495-500
Concentrations of nitrous-oxide (10024972) and halothane (151677) were measured at stations throughout one operating and one delivery room. No personnel were present. Air conditioning flow rates and patterns and the height of the anesthetic gas source were varied. Analyzers were set to measure gas concentrations at the air conditioning exhaust vent. Air flow patterns dominated anesthetic gas distribution and buoyancy effects were negligible. Venting waste gases at the floor did not reduce personnel exposure significantly. Areas of high concentrations existed but their occurrences and locations varied with air flow patterns. The results indicate that the exhaust grill is the best location for a single measurement of the average room concentration. The authors note that recirculating air conditioning systems reduce energy costs; but only the nonrecirculatory portion of the air exchanges reduces waste gas concentrations.
NIOSH-Publication; NIOSH-Contract; Contract-099-73-0073; Health-services; Medical-personnel; Anesthesia; Hospitals; Gases; Air-contaminants; Sampling-methods; Ventilation-systems
Dr. Piziali, Department of Mechanical Engineering, Stanford University, Stanford, California 94305