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Caffeine: a model compound for measuring liver function.

E Renner, H Wietholtz, P Huguenin

    Hepatology (Baltimore, Md.)
    |January 1, 1984
    PubMed
    Summary
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    Liver disease significantly reduces caffeine plasma clearance and prolongs its half-life. The caffeine breath test effectively measures liver function and disease severity.

    Area of Science:

    • Pharmacokinetics
    • Hepatology
    • Biochemistry

    Background:

    • Liver disease impairs drug metabolism.
    • Caffeine is a model drug for assessing liver function.
    • Hepatic microsomal activity is crucial for drug clearance.

    Purpose of the Study:

    • To evaluate the impact of liver disease on caffeine pharmacokinetics.
    • To assess the utility of a caffeine breath test in quantifying liver function.
    • To correlate caffeine metabolism with liver disease severity.

    Main Methods:

    • Administered [3-methyl-14C]caffeine intravenously to patients with cirrhosis, other liver diseases, and healthy volunteers.
    • Measured caffeine plasma clearance (Cl) and half-life (t1/2).
    • Quantified 14CO2 exhalation in breath as a marker of caffeine metabolism.

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    Main Results:

    • Cirrhosis significantly reduced Cl and prolonged t1/2 compared to controls.
    • 14CO2 production in breath correlated with Cl, indicating reduced metabolic activity.
    • The caffeine breath test showed sensitivity to even slight liver functional derangements.
    • Fasting caffeine plasma concentrations exhibited a hyperbolic relationship with Cl, suggesting utility in assessing disease severity.

    Conclusions:

    • Caffeine pharmacokinetics are significantly altered in patients with liver disease, particularly cirrhosis.
    • The caffeine breath test serves as a quantitative measure of hepatic microsomal activity.
    • Fasting caffeine levels may offer a simple assessment of liver disease severity.