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Various dissolution methods are utilized to assess a drug’s dissolution rate, including the flow-through cell, paddle-over-disk, cylinder, and reciprocating disk methods.The flow-through cell apparatus (USP (United States Pharmacopeia) method 4) comprises a reservoir for the dissolution medium and a pump that propels the medium through the cell containing the test sample. This method is crucial for assessing modified-release dosage forms with minimally soluble active ingredients,...
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Intravenous (IV) infusion is often utilized when continuous and controlled drug delivery is necessary, such as during surgery or in the treatment of chronic diseases. This method offers numerous advantages, including immediate drug action, precise control over dosage, and bypassing the first-pass metabolism.
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Compendial dissolution methods are standardized procedures defined by pharmacopeias to evaluate the rate at which a drug dissolves in a specific medium. These methods ensure batch-to-batch consistency, enable quality control, and support the prediction of drug bioavailability. They are critical for both immediate and modified-release drug products.The apparatuses used for dissolution testing differ in their design and mechanical function, but all aim to simulate the physiological environment of...
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Flow rates through intravenous access devices: an in vitro study.

Saleem I Khoyratty1, Pushpaj R Gajendragadkar2, Kiran Polisetty1

  • 1National Women's Hospital, Auckland City Hospital, Auckland, New Zealand.

Journal of Clinical Anesthesia
|May 18, 2016
PubMed
Summary

Maximizing intravenous fluid administration flow rates involves using pressure bags and removing needle-free valves. Modern devices like the rapid infusion catheter offer improved flow compared to standard cannulas.

Keywords:
CathetersDrug administration routesDrug therapyEquipment and suppliesTherapeuticsVascular access devices

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Area of Science:

  • Medical Devices
  • Fluid Dynamics
  • Clinical Engineering

Background:

  • Intravenous (IV) fluid administration is critical in various medical settings.
  • Quantitative data comparing flow rates of traditional cannulas and modern IV access devices is limited.
  • Understanding flow dynamics is essential for efficient fluid resuscitation.

Purpose of the Study:

  • To quantitatively compare the flow rates of modern intravenous access devices.
  • To investigate the impact of pressure bags and needle-free valves on IV fluid flow.
  • To provide data for informed clinical decisions regarding IV access device selection.

Main Methods:

  • An in vitro experimental study was conducted.
  • Fluid flow rates (crystalloid and colloid) were measured using a uroflowmeter.
  • Measurements were taken with and without pressure bags and needle-free valves under standardized conditions.

Main Results:

  • Larger cannula sizes demonstrated improved flow rates.
  • Fourteen-gauge cannulas showed significantly higher flow than 14G central venous lines.
  • The emergency infusion device and rapid infusion catheter exhibited significantly increased flow rates compared to a 14G cannula.
  • Needle-free valves impaired flow, particularly in wider bore devices, while pressure bags consistently improved flow.

Conclusions:

  • Optimizing IV fluid flow involves utilizing pressure bags and removing needle-free valves.
  • The rapid infusion catheter and emergency infusion catheter offer enhanced flow capabilities over standard 14G cannulas.
  • Knowledge of IV device flow rates can guide clinical practice and improve patient care.