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Nonlinear Pharmacokinetics: Drug Elimination for IV Bolus Injection00:59

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In pharmacokinetics, the elimination rate of a drug following a capacity-limited model is primarily controlled by two parameters: Vmax and KM. These parameters are crucial in how the drug behaves inside the body after administration.
Following the administration of a single intravenous (IV) bolus injection, we can determine the concentration of the drug in the plasma at any given time. This calculation is achieved using a specific equation that integrates the values of Vmax and KM.
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Nonlinear Pharmacokinetics: Michaelis-Menten Equation01:18

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The Michaelis–Menten equation is a fundamental model for describing capacity-limited kinetics in drug metabolism. It offers insights into the rate of decline of plasma drug concentration Cp over time, with Vmax and KM as pivotal parameters.
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All neuromuscular blocking agents are injected intravenously because they are poorly absorbed from the GI tract. Rapid onset is achieved with intravenous administration, although absorption is also adequate from an intramuscular injection. Since these agents are highly ionized, they do not readily penetrate cell membranes or cross the blood-brain barrier.
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Parenteral Anesthetics: Overview01:24

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Intravenous anesthetics are drugs administered parenterally to induce anesthesia or sedation. Propofol is a widely used agent formulated as a 1% emulsion in soybean oil, glycerol, and egg phosphatide. It induces rapid anesthesia primarily due to its rapid distribution from the bloodstream to target tissues and is metabolized in the liver. However, it can cause significant pain on injection and hypertriglyceridemia. Fospropofol, a water-based prodrug of propofol, lacks these adverse effects.
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Nonlinear Pharmacokinetics: Overview01:19

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Nonlinear or dose-dependent pharmacokinetics is a phenomenon that occurs when the pharmacokinetic parameters of certain drugs deviate from linear pharmacokinetics at higher doses. These drugs do not follow the expected first-order kinetics, where the rate of drug elimination is directly proportional to the drug concentration. Instead, they exhibit a nonlinear relationship, which can be attributed to several factors.
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The potency and duration of action of local anesthetics (LAs) are determined by their pharmacokinetics. Pharmacokinetics describes how LAs are absorbed, distributed, metabolized, and eliminated from the body. When administered to the vascular tissues, LAs are quickly absorbed and enter the systemic circulation, reducing their localized effects. Adding vasoconstrictors such as epinephrine to LAs reduces their absorption into the systemic circulation, making them clinically effective. The...
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Ketamine Pharmacokinetics.

Jasper Kamp, Erik Olofsen, Thomas K Henthorn

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    This study evaluated ketamine pharmacokinetic models through meta-analysis and model construction. A meta-analysis provides a clinically applicable approximation of ketamine population parameter estimates, useful when raw data is unavailable.

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    Area of Science:

    • Pharmacology
    • Pharmacokinetics
    • Mathematical Modeling

    Background:

    • Existing ketamine pharmacokinetic models vary in structure and complexity.
    • A systematic review and meta-analysis were conducted to evaluate these models.
    • A general ketamine pharmacokinetic model was constructed from raw data.

    Purpose of the Study:

    • To qualitatively and quantitatively evaluate existing ketamine pharmacokinetic models.
    • To construct a general ketamine pharmacokinetic model.
    • To compare meta-analytical findings with a model derived from raw data.

    Main Methods:

    • Systematic literature review and meta-analysis of pharmacokinetic parameters (volume of distribution, clearance).
    • Meta-regression analysis to assess covariate influence.
    • Construction of a population pharmacokinetic model from raw data sets.

    Main Results:

    • Meta-analysis included 18 studies; weighted mean volume of distribution was 252 L/70 kg and clearance was 79 L/h.
    • No significant effect of covariates was observed.
    • Models based on venous sampling showed longer context-sensitive half-times than arterial sampling models.
    • A pharmacokinetic model from raw data showed comparable results to the meta-analysis.

    Conclusions:

    • Meta-analysis of ketamine pharmacokinetics is feasible despite study heterogeneity.
    • The meta-analytical approach provides a clinically applicable approximation of ketamine population parameters.
    • This method is valuable when raw data sets are not accessible.