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Unplanned critical care admission poses a potential risk to patients and pressure on services. Existing guidelines base admission criteria on predicted risk of 30\u2010day mortality; however, this may not provide the best predictor of which patients would benefit from this service, and how unplanned admission might be avoided. A systematic review of MEDLINE, Embase,\n                    <jats:styled-content style=\"fixed-case\">CINAHL<\/jats:styled-content>\n                    , Web of Science, the Cochrane database and the grey literature identified 44 studies assessing risk factors for unplanned critical care admission in adult populations undergoing non\u2010cardiac, non\u2010thoracic and non\u2010neurological surgery. Comparative, quantitative analysis of the admission criteria was not feasible due to heterogeneity in study design. Age, anaemia, ASA physical status, body mass index, comorbidity burden, emergency surgery, high\u2010risk surgery, male sex, obstructive sleep apnoea, increased blood loss and operative duration were all independent risk factors for unplanned critical care admission. Age, body mass index, comorbidity extent and emergency surgery were the most common independent risk factors identified in the\n                    <jats:styled-content style=\"fixed-case\">USA<\/jats:styled-content>\n                    ,\n                    <jats:styled-content style=\"fixed-case\">UK<\/jats:styled-content>\n                    , Asia and Australia. These risk factors could be used in the development of a risk tool or decision tree for determining which patients might benefit from planned critical care admission. Future work should involve testing the sensitivity and specificity of these measures, either alone or in combination, to guide planned critical care admission, reduce patient deterioration and unplanned admissions.\n                  <\/jats:p>","DOI":"10.1111\/anae.14793","type":"journal-article","created":{"date-parts":[[2020,1,5]],"date-time":"2020-01-05T20:04:06Z","timestamp":1578254646000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":41,"title":["Critical care after major surgery: a systematic review of risk factors for unplanned admission"],"prefix":"10.1111","volume":"75","author":[{"given":"D. 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