title: Intraoperative air entrainment with Ohio Modulus anesthesia machine.
mesh_terms: D000328:Adult; D000776:Anesthesiology / Q000295:instrumentation*; D001932:Brain Neoplasms / Q000601:surgery; D005260:Female; D006801:Humans; D007796:Laminectomy; D008875:Middle Aged; D009584:Nitrogen
chemical_list: D009584:Nitrogen