Stability of plasma creatinine concentrations in acute complex long-stay admissions to a general medical service

D Siriwardane, Richard Woodman, Paul Hakendorf, J Martin, Graham White, David Ben-Tovim, Campbell Thompson

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    Assessment of glomerular filtration rate (GFR) is essential for calculating safe dosages of renally cleared drugs. Formulae for estimating reliable GFRs assume that plasma creatinine concentrations are stable. This study evaluates the variability of plasma creatinine (PCr) concentrations in patients admitted acutely to hospital. From 2,293 newly admitted patients, those in whom a subsequent clinically significant change (>20%) in PCr had occurred were identified. Median age was 81.1 years. Median baseline PCr was 90 umol/l (eGFR 60 ml/min). In total, 46.3% of the patients had a PCr that varied >20% from baseline three to seven days following admission. A 10-year increase in age increased the odds of a rise in PCr over the next week by 11.1% (odds ratio=1.11, 95% confidence interval=1.03, 1.20; p=0.007). Overall, baseline creatinine was a poor predictor of subsequent variation in PCr. GFR formulae for calculating renally-cleared drug dosages should be used with caution in elderly patients admitted acutely to hospital.

    Original languageEnglish
    Pages (from-to)540-543
    Number of pages4
    JournalClinical Medicine
    Volume10
    Issue number6
    DOIs
    Publication statusPublished - Dec 2010

    Keywords

    • Creatinine
    • Glomerular filtration rate
    • Renal function

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