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Related Experiment Videos

Multiport epidural catheters: does the air test work?

B L Leighton1, W G Topkis, J B Gross

  • 1Department of Anesthesiology, Jefferson Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania, USA. bleigh@alumni.princeton.edu

Anesthesiology
|June 6, 2000
PubMed
Summary
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The air test and blood aspiration methods can fail to detect misplaced multiport epidural catheters. Fractionating local anesthetic doses is crucial for safe epidural analgesia with these catheters.

Area of Science:

  • Anesthesiology
  • Obstetrics

Background:

  • Multiport epidural catheters are widely used but their safety checks lack validation.
  • The reliability of the air test for detecting intravascular placement of these catheters is unknown.

Purpose of the Study:

  • To evaluate the effectiveness of blood aspiration and the air test in identifying intravascular multiorifice epidural catheters.

Main Methods:

  • Three hundred laboring women received lumbar epidural catheters.
  • Blood aspiration and a 1 ml air injection with Doppler monitoring were performed.
  • Catheters were tested for blood aspiration and air embolism signs before anesthetic administration.

Main Results:

  • Intravascular placement was confirmed in 11 catheters.

Related Experiment Videos

  • The air test and blood aspiration yielded false-negative results in some cases.
  • One patient experienced toxicity symptoms after lidocaine injection despite a negative air test.

    • Conclusions:

    • Both blood aspiration and the air test demonstrated false-negative results for detecting misplaced epidural catheters.
    • Fractionating local anesthetic administration is essential for patient safety with multiorifice epidural catheters.