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Related Concept Videos

Dosage Regimens: Designs and Approaches01:28

Dosage Regimens: Designs and Approaches

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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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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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Nomograms and tabulations are vital tools used by clinicians to design accurate and individualized dosage regimens. These instruments provide a straightforward method for adjusting dosages based on individual patient characteristics, including age, weight, and physiological condition. The foundation of a drug's nomogram is population pharmacokinetic data collected and analyzed using specific models. This data simplifies complex equations, presenting them diagrammatically or tabularly for easy...
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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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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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Pediatric patient dosages diverge from adults due to disparities in body surface area, total body water, and extracellular fluid per kilogram of body weight. The dosing regimen considers the variations in pharmacokinetics and pharmacology across distinct age groups, encompassing preterm newborns, infants, young children, older children, and adolescents. Calculation of pediatric patient doses is predicated on determining body surface area, which exhibits a superior correlation with the child's...
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Related Experiment Video

Updated: May 7, 2026

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Patient Size Estimation Methods for CMS Size-Adjusted Dose Reporting: Variability, Challenges, and Recommendations.

Gary Ge1, Charles M Weaver1, Alexander Alsalihi1

  • 1Division of Diagnostic & Nuclear Medical Physics, Department of Radiology, University of Kentucky College of Medicine, Lexington, Kentucky.

Journal of the American College of Radiology : JACR
|August 2, 2025
PubMed
Summary
This summary is machine-generated.

Patient size estimation methods significantly impact CT size-adjusted dose (SAD) calculations and compliance with CMS quality measures. Standardizing these methods is crucial for consistent and reliable dose assessment in CT imaging.

Keywords:
CMSCT doseIQRsize-adjusted dose

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Area of Science:

  • Medical Imaging Physics
  • Radiology Quality Assurance

Background:

  • The Centers for Medicare & Medicaid Services (CMS) introduced the CT size-adjusted dose (SAD) quality measure (CMS1074v3) linked to reimbursement.
  • Inconsistent patient size estimation methods introduce variability, potentially compromising the reliability of SAD measurements and quality assessments.

Purpose of the Study:

  • To evaluate five distinct patient size estimation methods.
  • To assess the impact of these methods on CT size-adjusted dose (SAD) values and compliance with CMS thresholds.

Main Methods:

  • Retrospective analysis of 719 CT examinations across seven protocols (five abdomen, two chest).
  • Evaluation of five patient diameter calculation methods: HU Value Thresholding, Water-Equivalent Diameter (WED), Lateral/AP Conversion, LAT×AP, and (LAT + AP)/2.
  • Statistical analysis using Kruskal-Wallis and pairwise tests to identify significant differences.

Main Results:

  • Significant variability in SAD values was observed across different calculation methods.
  • Attenuation-based methods (HU, WED) overestimated SAD in chest scans; projection-based methods showed higher variability in abdominal scans.
  • Method-dependent variability affected compliance with CMS dose thresholds, leading to more failures with specific methods in chest and abdominal protocols. Urogram protocol showed unexpectedly low SAD values.

Conclusions:

  • Inconsistent patient size estimation and protocol mapping present technical challenges for the CMS SAD quality measure.
  • Standardizing examination mapping and reconsidering dose thresholds are recommended to improve clinical alignment and measure reliability.