title: Intragastric pH and upper gastrointestinal bleeding in the ICU.
authors.forename: R G
authors.initials: RG
authors.lastname: Karlstadt
authors.forename: D A
authors.initials: DA
authors.lastname: Hedrich
mesh_terms: D006471:Gastrointestinal Hemorrhage; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007362:Intensive Care Units; D008991:Monitoring, Physiologic / Q000379:methods; D013270:Stomach / Q000502:physiology