Nitrous oxide can be made more effective and predictable using a closed breathing circuit.
Weinberg
F
F
Drake
J
J
Vaughan
D
D
D000698:Analgesia / Q000379:methods; D018712:Analgesics, Non-Narcotic / Q000008:administration & dosage*; D016292:Procedural Sedation / Q000379:methods; D006801:Humans; D017214:Laryngeal Masks; D009609:Nitrous Oxide / Q000008:administration & dosage*
D018712:Analgesics, Non-Narcotic; D009609:Nitrous Oxide