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Osmolality refers to the number of solute particles per kilogram of solvent in a solution. Plasma osmolality specifically indicates the total number of solute particles per kilogram of water in blood plasma. This value reflects the body's hydration status and is tightly regulated through mechanisms controlling water intake and output. While water consumption is a conscious decision, the body has intrinsic regulatory systems to maintain fluid balance. Dehydration, a state of water deficit...
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Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test
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Inadequate Hydration Status of Test Subjects Can Affect Bioavailability Studies.

Reza Rastmanesh1,2,3

  • 1American Physical Society, College Park, Maryland 20740, USA.

ACS Pharmacology & Translational Science
|July 20, 2023
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Summary

Researchers identified a "hypohydration bias" affecting water-soluble drug bioavailability. Controlling hydration variables like osmolality and fluid balance is crucial for accurate drug bioavailability studies.

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Area of Science:

  • Pharmacokinetics
  • Drug Metabolism and Disposition
  • Physiological Chemistry

Background:

  • Bioavailability studies are critical for drug development.
  • Existing protocols may overlook crucial physiological factors influencing drug absorption.
  • Water-soluble drugs are particularly susceptible to variations in hydration status.

Purpose of the Study:

  • To identify limitations in current bioavailability studies.
  • To introduce and define the
  • hypohydration bias
  • .
  • To propose standardized methods for improving bioavailability measurements.

Main Methods:

  • Literature review and analysis of existing bioavailability study protocols.
  • Identification of confounding variables impacting drug absorption.
  • Proposal of specific physiological parameters to control during studies.

Main Results:

  • A novel bias, termed
  • hypohydration bias
  • , was identified.
  • Neglected confounding factors significantly impact bioavailability precision.
  • Key variables for control include serum/urine osmolality, dry weight, fluid balance, and saliva composition.

Conclusions:

  • Current bioavailability study protocols require revision.
  • A precise definition of hydration status is necessary.
  • Controlling specific physiological variables will enhance the accuracy of bioavailability measurements for water-soluble drugs.