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Drug Accumulation During Multiple Dosing: Repetitive IV Injections01:21

Drug Accumulation During Multiple Dosing: Repetitive IV Injections

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Calculating drug dosage and accumulation in multiple-dose regimens is crucial for achieving therapeutic efficacy while avoiding toxicity. This involves determining the plasma drug concentrations over time to optimize dosing schedules. The principle of superposition is fundamental in this process, allowing for the prediction of drug concentration in plasma following multiple doses based on single-dose data.The principle of superposition asserts that the plasma concentration-time curves from...
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Intermittent intravenous (IV) infusion is a method of drug administration where medications are delivered over short infusion periods followed by intervals of no drug delivery. This approach helps to prevent sustained high drug concentrations in the bloodstream, reducing the risk of adverse effects associated with prolonged exposure. Unlike continuous infusion, steady-state concentrations may not be achieved during a single dosing cycle but can be reached through repeated...
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Dosage Regimen: Multiple Oral Dosage01:25

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Understanding how a drug's concentration fluctuates within the body over time is crucial in pharmacokinetics, particularly with multiple oral doses. A graphical representation of multiple oral dosages provides insight into these dynamics. Typical accumulation curves of a drug's concentration in the body reveal a sawtooth pattern, indicating periodic peaks and troughs correlating with each dose administration and the drug's subsequent elimination.The plasma concentration at any time during an...
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Determination of Multiple Dosing Parameters: Loading and Maintenance Doses01:25

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A loading dose is an essential pharmacological strategy to rapidly achieve the target plasma drug concentration necessary for an immediate therapeutic effect. This approach is especially critical for drugs characterized by slow absorption or extended half-lives, where delaying therapeutic plasma levels could compromise treatment outcomes. By administering a loading dose, clinicians ensure a prompt onset of drug action, even for agents with complex pharmacokinetic profiles.Achieving steady-state...
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A rational dosage regimen considers a drug's pharmacokinetics, including its absorption, distribution, metabolism, and elimination from the body. By understanding these factors, the appropriate dosage can be determined, and the dosing schedule can be designed to achieve and maintain the desired therapeutic effect while minimizing adverse effects.
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Updated: Nov 10, 2025

Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
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Biologically consistent dose accumulation using daily patient imaging.

Nina I Niebuhr1,2,3, Mona Splinter4,5, Tilman Bostel6,7

  • 1Medical Physics in Radiation Oncology, German Cancer Research Center (DKFZ), Heidelberg, Germany. nina.niebuhr@med.uni-heidelberg.de.

Radiation Oncology (London, England)
|April 7, 2021
PubMed
Summary
This summary is machine-generated.

A new method called total biological dose (bEQDd) improves radiotherapy dose accumulation accuracy. This approach addresses inconsistencies in predicting biological effects, especially in hypofractionation and sensitive organs at risk.

Keywords:
Delivered doseDose accumulationImage guidanceLinear quadratic modelNormal tissue responseRadiobiology

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Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Radiotherapy Planning

Background:

  • The linear quadratic model (LQM) is widely used for predicting radiotherapy's biological effect.
  • A fundamental inconsistency exists in current dose accumulation methods within LQM.
  • This inconsistency can lead to inaccurate predictions of treatment outcomes.

Purpose of the Study:

  • Introduce and evaluate the concept of total biological dose (bEQDd).
  • To overcome the basic inconsistency in radiotherapy dose accumulation.
  • To improve the accuracy of biological effect prediction.

Main Methods:

  • Utilized daily CT imaging from nine prostate cancer patients undergoing IMRT.
  • Computed delivered deformed dose using deformable image registration (DIR).
  • Compared conventional dose accumulation (DA) with the novel bEQDd method, analyzing fractionation, DIR uncertainties, and alpha/beta values.

Main Results:

  • bEQDd was consistently higher than conventional DA, with significant hot spots (3.3-4.9 Gy) in high dose gradient regions.
  • Hypofractionation showed even larger differences (up to 8.4 Gy).
  • Difference magnitudes were comparable to DIR uncertainties and greater than alpha/beta uncertainties.

Conclusions:

  • bEQDd dose accumulation enhances biological effect prediction accuracy.
  • The method has the highest impact on serial organs at risk and hypofractionation.
  • While dose-volume parameters show minimal change, local dose differences from bEQDd can influence dose-response modeling and adaptive strategies.