title: Comparison of anti-pollution modifications of Mapleson A and D anaesthetic systems.
abstract: Hafnia A and Hafnia D anaesthetic systems are non-polluting modifications of the Mapleson A and D systems. The excess gas is vented in the Hafnia systems directly and continuously via a calibrated ejector flowmeter. Sixteen adult patients anaesthetized for abdominal surgery were ventilated and either Hafnia A or D systems at six different fresh gas flows. No difference between the Hafnia A and D systems could be demonstrated in the values of arterial carbon dioxide tension measured with the same fresh gas flow, despite gas flows in opposite directions.
mesh_terms: D000368:Aged; D000397:Air Pollution / Q000517:prevention & control*; D000769:Anesthesia, Inhalation / Q000295:instrumentation / Q000379:methods*; D002245:Carbon Dioxide / Q000097:blood; D006801:Humans; D008875:Middle Aged; D010313:Partial Pressure; D012121:Respiration, Artificial; D012212:Rheology
chemical_list: D002245:Carbon Dioxide