BACKGROUND: As environmental pollution by @entity3810 may influence the health of the personnel working in operating theatres, the incidence and magnitude of @entity3810 ( @entity3727 ) leakage, when using a face mask or a laryngeal mask airway (LMA) for controlled ventilation, were studied in 34 @entity1 scheduled for elective cystoscopy. METHODS: A semi-closed gas delivery ventilation system with active scavenging was used. The @entity3727 concentrations were measured every 8 s at a position 30 cm above the @entity1 's mouth with a @entity3727 gas monitor (GD 200, Simrad Optronics). RESULTS: When using a face mask, the leakage of @entity3727 resulted in a @entity3727 concentration of 157 (85-332) p.p.m. (parts per million) (median concentration and 25% and 75% percentiles). With the LMA, a lower median concentration of @entity3727 of 60 (28-126) p.p.m. was found (P=0.04). With the face mask, a concentration above 100 p.p.m. was found during 51% of the exposure time compared to 24% of the time in the LMA group. CONCLUSION: Environmental pollution was less with the LMA than the face mask, but under the conditions of the study both modes of airway management were associated with levels of @entity3727 peak concentrations in the breathing zone of anaesthetists that are deemed to be excessively high by the Danish National Institute for Occupational Safety.

Pollution with XXXX using laryngeal mask or face mask.

@entity1 :: ('9606', 'Species') :: ['patients', 'patient'] @entity3727 :: ('CHEBI:17045', 'Chemical') :: ['N2O'] @entity3810 :: ('MESH:D009609', 'Chemical') :: ['nitrous oxide']
@entity3810 :: (MESH:D009609,Chemical) :: ['nitrous oxide']
