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Related Experiment Videos

Differential flow from multihole epidural catheters.

I Power1, J Thorburn

  • 1University Department of Anaesthetics, Royal Infirmary, Edinburgh.

Anaesthesia
|October 1, 1988
PubMed
Summary
This summary is machine-generated.

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Epidural catheter injection pressures were measured in vivo and in vitro. Higher injection pressures increase local anesthetic spread through epidural catheter holes, impacting dose effectiveness.

Area of Science:

  • Anesthesiology
  • Pharmacology
  • Medical Devices

Background:

  • Epidural anesthesia is commonly used for labor pain management.
  • The spread of local anesthetics via epidural catheters can be influenced by injection dynamics.
  • Understanding catheter performance under varying pressures is crucial for optimizing anesthetic delivery.

Purpose of the Study:

  • To quantify the in vivo pressures used for epidural local anesthetic administration with 16- and 18-gauge multihole catheters.
  • To investigate the in vitro fluid flow characteristics of these catheters at different applied pressures.

Main Methods:

  • In vivo pressure measurements were recorded during epidural administration in 10 laboring patients for each catheter gauge (16- and 18-gauge).
  • In vitro experiments applied similar pressure ranges to 10 catheters of each gauge to observe fluid flow from the catheter holes.

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  • Fluid flow patterns were documented as pressure increased, noting the sequence of hole activation.

    • Main Results:

    • In vivo pressure ranges for 16-gauge catheters were 39.9-266 kPa (mean 167.2 kPa), and for 18-gauge, 53.2-266 kPa (mean 159 kPa).
    • In vitro, increasing pressure led to sequential fluid flow from proximal, then middle, and finally distal holes for both catheter gauges.
    • This suggests pressure-dependent flow dynamics through the multihole catheters.

    Conclusions:

    • Epidural injection pressure significantly influences local anesthetic spread through multihole catheters.
    • The observed pressure-dependent flow highlights the potential variability in anesthetic effect.
    • Careful consideration of injection pressure is essential, particularly if the epidural catheter is misplaced (e.g., partially through the dura).