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      Relationship between duration of hospital-acquired acute kidney injury and mortality: a prospective observational study

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          Abstract

          Background/Aims

          New definitions of acute kidney injury (AKI) have recently emerged. Some studies have suggested that duration of AKI is an additional predictive parameter for mortality. Here, we evaluated whether AKI duration was predictive of long-term mortality in patients with hospital-acquired acute kidney injury (HAAKI).

          Methods

          We prospectively enrolled patients who developed HAAKI at an urban university hospital, from September 2007 to August 2008 and followed them until December 2011. Patients were divided into two groups by duration of the AKI (1 to 5 days vs. ≥ 6 days), and long-term mortality was compared.

          Results

          HAAKI developed in 1.2% of patients during the enrollment period. The median follow-up period was 240 days (interquartile range, 53 to 1,428). In 42.3% of patients (n = 52), the AKI lasted 1 to 5 days, while it lasted ≥ 6 days in 57.7% (n = 71). Survival analysis showed that a longer duration of AKI increased the risk of death. Long-term survival was significantly different in the two groups.

          Conclusions

          The duration of AKI influenced mortality rates in hospitalized patients. Thus, AKI duration is a parameter affecting mortality in HAAKI.

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          Most cited references21

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

          Glenn Chertow, Elisabeth Burdick, Melissa M Honour … (2005)
          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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            An assessment of the RIFLE criteria for acute renal failure in hospitalized patients.

            Shigehiko Uchino, Rinaldo Bellomo, Donna Goldsmith … (2006)
            The Acute Dialysis Quality Initiative (ADQI) Group published a consensus definition (the RIFLE criteria) for acute renal failure. We sought to assess the ability of the RIFLE criteria to predict mortality in hospital patients. Retrospective single-center study. University-affiliated hospital. All patients admitted to the study hospital between January 2000 and December 2002. Patients were excluded if they were younger than 15 yrs old, were on chronic dialysis, or had kidney transplant or if their length of hospital stay was <24 hrs. None. We included 20,126 patients. Mean age was 64 yrs, 14.7% of patients required intensive care unit admission, and hospital mortality was 8.0%. According to the RIFLE criteria, 9.1% of all patients were in the Risk category for acute renal failure, 5.2% were in the Injury category, and 3.7% were in the Failure category. There was an almost linear increase in hospital mortality from Normal to Failure (Normal, 4.4%; Risk, 15.1%; Injury, 29.2%; and Failure, 41.1%). Multivariate logistic regression analysis showed that all RIFLE criteria were significantly predictive factors for hospital mortality, with an almost linear increase in odds ratios from Risk to Failure (odds ratios, Risk 2.5, Injury 5.4, Failure 10.1). The RIFLE criteria for acute renal failure classified close to 20% of our study patients as having some degrees of acute impairment in renal function and were useful in predicting their hospital mortality.
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              The RIFLE criteria and mortality in acute kidney injury: A systematic review.

              Z Ricci, D. Cruz, C. Ronco (2008)
              In 2004, the Acute Dialysis Quality Initiative workgroup proposed a multilevel classification system for acute kidney injury (AKI) identified by the acronym RIFLE (Risk, Injury, Failure, Loss of kidney function, and End-stage kidney disease). Several studies have been published aiming to validate and apply it in clinical practice, verifying whether outcome progressively worsened with the severity of AKI. A literature search from August 2004 to June 2007 was conducted: 24 studies in which the RIFLE classification was used to define AKI were identified. In 13 studies, patient-level data on mortality were available for Risk, Injury, and Failure patients, as well as those without AKI (non-AKI). Death was reported at ICU discharge, hospital discharge, 28, 30, 60, and 90 days. The pooled estimate of relative risk (RR) for mortality for patients with R, I, or F levels compared with non-AKI patients were analyzed. Over 71 000 patients were included in the analysis of published reports. With respect to non-AKI, there appeared to be a stepwise increase in RR for death going from Risk (RR=2.40) to Injury (RR=4.15) to Failure (6.37, P<0.0001 for all). There was significant intertrial heterogeneity as expected with the varying patient populations studied. The RIFLE classification is a simple, readily available clinical tool to classify AKI in different populations. It seems to be a good outcome predictor, with a progressive increase in mortality with worsening RIFLE class. It also suggests that even mild degrees of kidney dysfunction may have a negative impact on outcome. Further refinement of RIFLE nomenclature and classification is ongoing.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Korean J Intern Med
                Journal ID (iso-abbrev): Korean J. Intern. Med
                Journal ID (publisher-id): KJIM
                Title: The Korean Journal of Internal Medicine
                Publisher: The Korean Association of Internal Medicine
                ISSN (Print): 1226-3303
                ISSN (Electronic): 2005-6648
                Publication date (Print): March 2015
                Publication date (Electronic): 27 February 2015
                Volume: 30
                Issue: 2
                Pages: 205-211
                Affiliations
                [1 ]Division of Nephrology, Soonchunhyang University Hospital, Seoul, Korea.
                [2 ]Biostatistical Consulting Unit, Soonchunhyang University Hospital, Seoul, Korea.
                [3 ]Hyonam Kidney Laboratory, Soonchunhyang University Hospital, Seoul, Korea.
                Author notes
                Correspondence to Soon Hyo Kwon, M.D. Division of Nephrology and Hyonam Kidney Laboratory, Soonchunhyang University Hospital, 59 Daesagwan-ro, Yongsan-gu, Seoul 140-743, Korea. Tel: +82-2-709-9029, Fax: +82-2-792-5812, ksoonhyo@ 123456schmc.ac.kr
                Article
                DOI: 10.3904/kjim.2015.30.2.205
                PMC ID: 4351327
                SO-VID: a37cf7e4-1e7a-4542-8627-5cfcbfec3a4d
                Copyright © Copyright © 2015 The Korean Association of Internal Medicine
                License:

                This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : 29 April 2014
                Date revision received : 27 May 2014
                Date accepted : 30 June 2014
                Funding
                Funded by: Soonchunhyang University Research Fund
                Categories
                Subject: Original Article
                Subject: Nephrology

                ScienceOpen disciplines: Internal medicine
                Keywords: acute kidney injury,duration,mortality,recovery,survival
                Data availability:
                ScienceOpen disciplines: Internal medicine
                Keywords: acute kidney injury, duration, mortality, recovery, survival

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