Sudden increase in end-tidal nitrogen due to changing vaporizers.
D000368:Aged; D000769:Anesthesia, Inhalation / Q000295:instrumentation*; D018685:Anesthetics, Inhalation / Q000008:administration & dosage; D003399:Craniotomy; D000077335:Desflurane; D003937:Diagnosis, Differential; D004618:Embolism, Air / Q000175:diagnosis; D004868:Equipment Failure; D005260:Female; D006801:Humans; D002532:Intracranial Aneurysm / Q000601:surgery; D007530:Isoflurane / Q000008:administration & dosage / Q000031:analogs & derivatives; D009330:Nebulizers and Vaporizers; D009584:Nitrogen / Q000378:metabolism*; D013990:Tidal Volume
D018685:Anesthetics, Inhalation; D000077335:Desflurane; D007530:Isoflurane; D009584:Nitrogen