title: Invited commentary.
authors.affiliation: Department of Anesthesiology and Critical Care, University of Pennsylvania, 3400 Spruce St, Dulles 680, Philadelphia, PA 19104-4283, USA.
authors.forename: Ashish C
authors.initials: AC
authors.lastname: Sinha
authors.forename: Albert T
authors.initials: AT
authors.lastname: Cheung
mesh_terms: D003072:Cognition Disorders; D003243:Consciousness; D003422:Critical Care / Q000523:psychology; D003693:Delirium / Q000453:epidemiology* / Q000209:etiology; D017558:Elective Surgical Procedures / Q000009:adverse effects* / Q000523:psychology; D005500:Follow-Up Studies; D006801:Humans; D007297:Inpatients / Q000523:psychology; D007362:Intensive Care Units; D007902:Length of Stay; D008569:Memory Disorders / Q000453:epidemiology*; D008875:Middle Aged