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: D005745:Gastric Acidity Determination; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis*; D006801:Humans; D007362:Intensive Care Units