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      Is Anemia at Hospital Admission Associated with In-Hospital Acute Kidney Injury Occurrence?

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          Abstract

          Background: The effect of acute kidney injury (AKI) on anemia has been well-documented. However, the effect of ‘preexisting’ anemia on AKI has been less addressed. The aims of the present study were to investigate (1) the association between anemia at hospital admission and AKI occurrence, and (2) the effect of ‘preexisting’ anemia on the clinical outcomes of AKI. Methods: A retrospective cohort study was undertaken among patients aged ≧17 years who were admitted to our hospital during the year 2006 (n = 34,802). Anemia at hospital admission and AKI occurrences were determined using the WHO definition and the RIFLE criteria, respectively. A subgroup of patients with an estimated glomerular filtration rate ≧60 ml/min/1.73 m<sup>2</sup> was analyzed separately to control for the effect of chronic kidney disease on anemia. Results: The cumulative incidence of AKI was 11.2% in anemic patients at hospital admission, compared to 5.5% in nonanemic subjects. The association between anemia at admission and AKI occurrence remained statistically significant after controlling for potential confounders (odds ratio 1.5, 95% CI 1.4–1.6). In addition, an association between anemia at hospital admission and clinical outcomes of AKI was observed. Conclusion: Anemia at hospital admission should be recognized as a potential risk factor for in-hospital AKI occurrence.

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          Incidence and prognostic importance of acute renal failure after percutaneous coronary intervention.

          Charanjit Rihal, Stephen C Textor, Diane E. Grill … (2002)
          In patients undergoing percutaneous coronary intervention (PCI) in the modern era, the incidence and prognostic implications of acute renal failure (ARF) are unknown. With a retrospective analysis of the Mayo Clinic PCI registry, we determined the incidence of, risk factors for, and prognostic implications of ARF (defined as an increase in serum creatinine [Cr] >0.5 mg/dL from baseline) after PCI. Of 7586 patients, 254 (3.3%) experienced ARF. Among patients with baseline Cr 2.0, all had a significant risk of ARF. In multivariate analysis, ARF was associated with baseline serum Cr, acute myocardial infarction, shock, and volume of contrast medium administered. Twenty-two percent of patients with ARF died during the index hospitalization compared with only 1.4% of patients without ARF (P 2.0 are at high risk for ARF. ARF was highly correlated with death during the index hospitalization and after dismissal.
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            Acute kidney injury increases risk of ESRD among elderly.

            Areef Ishani, Jay L Xue, Jonathan Himmelfarb … (2009)
            Risk for ESRD among elderly patients with acute kidney injury (AKI) has not been studied in a large, representative sample. This study aimed to determine incidence rates and hazard ratios for developing ESRD in elderly individuals, with and without chronic kidney disease (CKD), who had AKI. In the 2000 5% random sample of Medicare beneficiaries, clinical conditions were identified using Medicare claims; ESRD treatment information was obtained from ESRD registration during 2 yr of follow-up. Our cohort of 233,803 patients were hospitalized in 2000, were aged > or = 67 yr on discharge, did not have previous ESRD or AKI, and were Medicare-entitled for > or = 2 yr before discharge. In this cohort, 3.1% survived to discharge with a diagnosis of AKI, and 5.3 per 1000 developed ESRD. Among patients who received treatment for ESRD, 25.2% had a previous history of AKI. After adjustment for age, gender, race, diabetes, and hypertension, the hazard ratio for developing ESRD was 41.2 (95% confidence interval [CI] 34.6 to 49.1) for patients with AKI and CKD relative to those without kidney disease, 13.0 (95% CI 10.6 to 16.0) for patients with AKI and without previous CKD, and 8.4 (95% CI 7.4 to 9.6) for patients with CKD and without AKI. In summary, elderly individuals with AKI, particularly those with previously diagnosed CKD, are at significantly increased risk for ESRD, suggesting that episodes of AKI may accelerate progression of renal disease.
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              Acute kidney injury after cardiac surgery: focus on modifiable risk factors.

              Keyvan Karkouti, Duminda N. Wijeysundera, Terrence Yau … (2009)
              Acute kidney injury (AKI) after cardiac surgery is a major health issue. Lacking effective therapies, risk factor modification may offer a means of preventing this complication. The objective of the present study was to identify and determine the prognostic importance of such risk factors. Data from a multicenter cohort of 3500 adult patients who underwent cardiac surgery at 7 hospitals during 2004 were analyzed (using multivariable logistic regression modeling) to determine the independent relationships between 3 thresholds of AKI (>25%, >50%, and >75% decrease in estimated glomerular filtration rate within 1 week of surgery or need for postoperative dialysis) with death rates, as well as to identify modifiable risk factors for AKI. The 3 thresholds of AKI occurred in 24% (n=829), 7% (n=228), and 3% (n=119) of the cohort, respectively. All 3 thresholds were independently associated with a >4-fold increase in the odds of death and could be predicted with several perioperative variables, including preoperative intra-aortic balloon pump use, urgent surgery, and prolonged cardiopulmonary bypass. In particular, 3 potentially modifiable variables were also independently and strongly associated with AKI. These were preoperative anemia, perioperative red blood cell transfusions, and surgical reexploration. AKI after cardiac surgery is highly prevalent and prognostically important. Therapies aimed at mitigating preoperative anemia, perioperative red blood cell transfusions, and surgical reexploration may offer protection against this complication.
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                Author and article information

                Journal
                Journal ID (publisher-id): NEC
                Journal ID (nlm-ta): Nephron Clin Pract
                Journal ID (doi): 10.1159/issn.1660-2110
                Title: Nephron Clinical Practice
                Publisher: S. Karger AG
                ISSN (Electronic): 1660-2110
                Publication date Subscription-year: 2010
                Publication date (Print): June 2010
                Publication date (Electronic): 21 April 2010
                Volume: 115
                Issue: 2
                Pages: c168-c176
                Affiliations
                aPediatrics Department and bNephrology Department, Western Galilee Hospital, Nahariya, cFaculty of Medicine, Technion, and dSchool of Public Health, Faculty of Social Welfare and Health Sciences, University of Haifa, Haifa, Israel
                Article
                Publisher ID: 312881 Other ID: Nephron Clin Pract 2010;115:c168–c176
                DOI: 10.1159/000312881
                PubMed ID: 20407277
                SO-VID: 95e9953c-f801-43e5-a1f9-c9e33f80fbae
                Copyright © © 2010 S. Karger AG, Basel
                License:

                Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher. Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug. Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.

                History
                Date received : 02 September 2009
                Date accepted : 29 October 2009
                Page count
                Figures: 2, Tables: 3, References: 32, Pages: 1
                Categories
                Subject: Original Paper

                ScienceOpen disciplines: Cardiovascular Medicine,Nephrology
                Keywords: Anemia,Risk factors,Hospitalization
                Data availability:
                ScienceOpen disciplines: Cardiovascular Medicine, Nephrology
                Keywords: Anemia, Risk factors, Hospitalization

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