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      Acute kidney injury, mortality, length of stay, and costs in hospitalized patients.

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          Abstract

          The marginal effects of acute kidney injury on in-hospital mortality, length of stay (LOS), and costs have not been well described. A consecutive sample of 19,982 adults who were admitted to an urban academic medical center, including 9210 who had two or more serum creatinine (SCr) determinations, was evaluated. The presence and degree of acute kidney injury were assessed using absolute and relative increases from baseline to peak SCr concentration during hospitalization. Large increases in SCr concentration were relatively rare (e.g., >or=2.0 mg/dl in 105 [1%] patients), whereas more modest increases in SCr were common (e.g., >or=0.5 mg/dl in 1237 [13%] patients). Modest changes in SCr were significantly associated with mortality, LOS, and costs, even after adjustment for age, gender, admission International Classification of Diseases, Ninth Revision, Clinical Modification diagnosis, severity of illness (diagnosis-related group weight), and chronic kidney disease. For example, an increase in SCr >or=0.5 mg/dl was associated with a 6.5-fold (95% confidence interval 5.0 to 8.5) increase in the odds of death, a 3.5-d increase in LOS, and nearly 7500 dollars in excess hospital costs. Acute kidney injury is associated with significantly increased mortality, LOS, and costs across a broad spectrum of conditions. Moreover, outcomes are related directly to the severity of acute kidney injury, whether characterized by nominal or percentage changes in serum creatinine.

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          Author and article information

          Journal
          J Am Soc Nephrol
          Journal of the American Society of Nephrology : JASN
          American Society of Nephrology (ASN)
          1046-6673
          1046-6673
          Nov 2005
          : 16
          : 11
          Affiliations
          [1 ] Division of Nephrology, Department of Medicine, University of California San Francisco, 94118-1211, USA. chertowg@medicine.ucsf.edu
          Article
          ASN.2004090740
          10.1681/ASN.2004090740
          16177006
          f7c86a7e-caef-4d67-b7fe-7dc969784c7a
          History

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