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Related Experiment Videos

New mathematical model for accurate description of absorption kinetics of paracetamol given orally with a high

M Sanaka1, Y Kuyama, Y Shimomura

  • 1Department of Internal Medicine, Tokyo Metropolitan Komagome Hospital, Japan.

International Journal of Clinical Pharmacology and Therapeutics
|April 18, 2003
PubMed
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The paracetamol method accurately assesses gastric emptying (GE) rates with caloric liquid meals. Time to maximum paracetamol concentration (tmax) detects delayed GE, while Cmax/AUCinfinity identifies rapid GE.

Area of Science:

  • Pharmacokinetics
  • Gastroenterology
  • Mathematical modeling

Background:

  • Gastric emptying (GE) of liquids is often measured using the paracetamol absorption method.
  • The conventional 1-compartment model assumes first-order kinetics for paracetamol absorption, which may be inaccurate with caloric liquid meals due to zero-order GE.
  • The reliability of tmax and Cmax/AUCinfinity as indicators of GE rate with caloric meals requires investigation.

Purpose of the Study:

  • To develop a new mathematical model for paracetamol absorption with caloric liquid meals.
  • To clarify the characteristics of tmax and Cmax/AUCinfinity as rate parameters using the new model.
  • To assess the utility of tmax and Cmax/AUCinfinity in detecting altered GE rates.

Main Methods:

  • A novel mathematical model was developed to describe paracetamol absorption kinetics with caloric liquid meals.

Related Experiment Videos

  • Mathematical expressions for tmax and Cmax/AUCinfinity were derived in terms of GE rates.
  • Extensive simulation studies were conducted to analyze the behavior of tmax and Cmax/AUCinfinity.

    • Main Results:

    • Simulations confirmed that both tmax and Cmax/AUCinfinity can reflect GE rates.
    • tmax demonstrated higher sensitivity in detecting changes in GE compared to Cmax/AUCinfinity.
    • Cmax/AUCinfinity proved more reliable than tmax when GE rates were very rapid.

    Conclusions:

    • In the paracetamol method with caloric liquid test meals, tmax and Cmax/AUCinfinity are suitable indicators of GE.
    • tmax is effective for detecting delayed gastric emptying.
    • Cmax/AUCinfinity is effective for detecting rapid gastric emptying.