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Dose Size and Dosing Frequency: Determination Methods01:21

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Determining the optimal dose size and dosing frequency in pharmacotherapy is crucial for achieving therapeutic effectiveness while minimizing adverse effects. This article explores the methodologies employed in determining these parameters, focusing on their significance and interplay to tailor dosing regimens.Dose Size: Dose size refers to the amount of a drug administered in a single dose. It is determined based on the drug's pharmacodynamics and pharmacokinetics properties and...
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Dosage Regimen: Fixed Dose01:01

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Fixed-dose regimens are a common approach to administer drugs to achieve and maintain desired levels of the drug in the body. In this dosing strategy, a specific amount of medication is given at regular intervals, often multiple times a day, to ensure a consistent drug concentration in the bloodstream.
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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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Drug Dosing in Renal Diseases: Dose Adjustments Based on Drug Clearance and Elimination Rate Constant01:25

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In patients with renal disease, dosage adjustments are necessary to maintain therapeutic plasma drug concentrations and prevent toxicity or subtherapeutic exposure. Renal impairment alters drug pharmacokinetics, especially in conditions like uremia, where changes such as prolonged elimination half-life and altered apparent volume of distribution can significantly affect drug disposition. These changes require careful modification of the dosing regimen to achieve the desired clinical...
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Dosage Regimen: Individualization01:24

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Individualization in dosing regimens is the customization of medication doses for individual patients. Its necessity arises from the goal of maximizing therapeutic benefits while minimizing risks. This approach is pivotal because human responses to drugs can vary widely; what is effective for one person may be inadequate or excessive for another. Interpatient (intersubject) variability refers to differences in drug responses between individuals, while intrapatient (intrasubject) variability...
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Dosage Regimens: Designs and Approaches01:28

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Designing a dosage regimen, which refers to the manner of drug administration, is a complex process involving the selection of drug dose, route, and frequency. This process is underpinned by pharmacokinetic parameters derived from tests and population averages. These parameters are then tailored to patient-specific variables such as diagnosis, demographics, and allergy status. Once therapy commences, therapeutic response monitoring is critical and achieved through clinical and physical...
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A Comprehensive CT Dose Reduction Program Using the ACR Dose Index Registry.

Brent P Little1, Phuong-Anh Duong1, Jessie Knighton1

  • 1Department of Radiology and Imaging Sciences, Emory University Hospital, Atlanta, Georgia.

Journal of the American College of Radiology : JACR
|October 18, 2015
PubMed
Summary
This summary is machine-generated.

Implementing a comprehensive CT dose reduction program utilizing the ACR Dose Index Registry (DIR) significantly lowered radiation exposure in a large healthcare system. This initiative achieved substantial reductions in dose-length product across multiple CT scan types.

Keywords:
American College of RadiologyIonizing radiationdose reductiondose registryquality improvement

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Area of Science:

  • Radiology
  • Medical Physics
  • Health Informatics

Background:

  • Radiation dose management is crucial in medical imaging.
  • The American College of Radiology (ACR) Dose Index Registry (DIR) provides valuable data for benchmarking and improvement.
  • Large academic health care systems face challenges in standardizing and reducing radiation doses.

Purpose of the Study:

  • To demonstrate the effectiveness of the ACR DIR in guiding a CT dose reduction program.
  • To quantify radiation dose changes following the implementation of a comprehensive dose reduction initiative.
  • To assess the impact of the program on institution-wide CT radiation doses.

Main Methods:

  • Collected radiation dose data for head, chest, and abdomen/pelvis CT examinations using the ACR DIR.
  • Established a baseline analysis of 7,255 CT examinations across seven scanners.
  • Implemented a dose reduction initiative including protocol changes, iterative reconstruction, and technologist education.
  • Analyzed 14,938 examinations in the post-implementation period for dose comparison.

Main Results:

  • Achieved average median dose-length product (DLP) reductions of 10-30% across various CT protocols.
  • Post-implementation institution-wide CT DLPs were lower than ACR DIR benchmarks by 6-33%.
  • Significant dose reductions were observed for chest CT without contrast (33%), chest CT with contrast (32%), and abdominal/pelvic CT with contrast (26%).

Conclusions:

  • A comprehensive CT dose reduction program, supported by the ACR DIR, is effective in achieving substantial radiation dose decreases.
  • The ACR DIR serves as a vital tool for monitoring and driving improvements in radiation safety within healthcare institutions.
  • Sustained efforts in protocol optimization and technologist education contribute to successful dose reduction strategies.