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Related Concept Videos

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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Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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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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It is not uncommon for complete drug pharmacokinetic profiles to remain elusive in pharmacokinetics. This necessitates certain educated assumptions by pharmacokineticists to determine appropriate dosage regimens without comprehensive pharmacokinetic data from animal or human studies. One prevalent assumption is setting the bioavailability factor, denoted as F, to 1 or 100%. This assumption caters to the scenario where a drug doesn't achieve full systemic absorption, resulting in the patient...
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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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Minimal Erythema Dose MED Testing
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Dose Quantification in UV Phototherapy.

David Robert Grimes1,2

  • 1Cancer Research UK/MRC Oxford Institute for Radiation Oncology, Gray Laboratory, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, Oxford, OX3 7DQ, UK. davidrobert.grimes@oncology.ox.ac.uk.

Advances in Experimental Medicine and Biology
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Summary
This summary is machine-generated.

Accurate measurement of ultraviolet (UV) radiation dose is crucial for effective skin treatment. This ensures therapeutic benefits while preventing harmful side effects from overexposure.

Keywords:
Dose modelsIrradiance measurementQuantificationUltraviolet radiation

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Area of Science:

  • Dermatology
  • Photomedicine
  • Medical Physics

Background:

  • Ultraviolet (UV) light therapy is a recognized treatment for various skin conditions.
  • However, excessive UV exposure poses significant health risks.
  • Maintaining UV dosage within a safe and effective therapeutic window is essential.

Purpose of the Study:

  • To explore methods for accurately determining UV irradiance and skin dose.
  • To address challenges in UV dosimetry for skin treatments.
  • To provide clinical protocols and mathematical models for precise UV dose quantification.

Main Methods:

  • Review of existing methods for UV dose determination.
  • Discussion of clinical protocols for quantifying UV radiation.
  • Presentation of mathematical models for estimating UV dose to the skin.

Main Results:

  • Accurate UV dose determination is complex due to surface absorption and patient/source orientation.
  • Irregular patient anatomy further complicates precise dose calibration.
  • Standardized protocols and modeling are necessary for reliable UV dosimetry.

Conclusions:

  • Precise UV dosimetry is vital for maximizing therapeutic outcomes and minimizing adverse effects.
  • Accurate measurement of irradiance and skin dose is key to safe phototherapy.
  • Mathematical models and standardized protocols aid in achieving reliable UV treatment calibration.