title: Continuous hypopharyngeal pH during anesthesia via mask.
mesh_terms: D000328:Adult; D000368:Aged; D000769:Anesthesia, Inhalation / Q000295:instrumentation*; D005764:Gastroesophageal Reflux / Q000175:diagnosis; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007013:Hypopharynx / Q000378:metabolism*; D008397:Masks; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000379:methods