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    Whole body potassium and total exchangeable potassium in elderly patients with cardiac-failure.

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    Authors
    Lye, Michael
    Winston, Barry
    Affiliation
    Christie Hospital and Holt Radium Institute, Manchester
    Issue Date
    1979-11
    
    Metadata
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    Abstract
    Body potassium status of patients with cardiac failure may be estimated by a number of methods, but increasing reliance is being placed upon radioisotope dilution with 42K which measures the total exchangeable potassium. Total exchangeable potassium comprises between 86 per cent and 97 per cent of whole body potassium in healthy subjects. We have measured total exchangeable potassium in 22 oedema-free elderly patients with stable cardiac failure and compared the results with simultaneously determined measurements of whole body potassium obtained by whole body counting. The mean whole body potassium was 2360 +/- 640 mmol. The mean value of total exchangeable potassium measured at 24 hours was 1820 +/- 610 mmol (77% of whole body potassium) and increased further to 2000 +/- 600 mmol (84%) when measured after 48 hours. In patients with cardiac failure and, perhaps, also other patients with a history of fluid retention, the mixing of a tracer dose may be significantly delayed, which if not appreciated may lead to an overestimate of potassium depletion.
    Citation
    Whole body potassium and total exchangeable potassium in elderly patients with cardiac-failure. 1979, 42 (5):568-72 Br Heart J
    Journal
    British Heart Journal
    URI
    http://hdl.handle.net/10541/189129
    PubMed ID
    117819
    Type
    Article
    Language
    en
    ISSN
    0007-0769
    Collections
    All Christie Publications

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