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Related Experiment Videos

The malpositioned Greenfield filter: lessons learned.

D P Otchy1, B M Elliott

  • 1Vascular Surgery Service, Brooke Army Medical Center, Fort Sam Houston, TX 78234.

The American Surgeon
|October 1, 1987
PubMed
Summary
This summary is machine-generated.

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Malpositioned Greenfield filters require immediate identification. Measuring the open leg diameter on postprocedure radiographs is a reliable method to detect filter malposition, regardless of vertebral level.

Area of Science:

  • Vascular Surgery
  • Medical Imaging

Background:

  • Greenfield filters are crucial for preventing pulmonary embolism.
  • Timely recognition of malpositioned filters is essential for patient safety.

Purpose of the Study:

  • To identify reliable parameters for detecting malpositioned Greenfield filters.
  • To evaluate the adequacy of vertebral level assessment for filter placement.

Main Methods:

  • Retrospective review of postprocedure radiographs for 21 Greenfield filter placements.
  • Analysis of filter leg diameter and vertebral level in correctly and incorrectly positioned filters.

Main Results:

  • Three out of 21 Greenfield filters were malpositioned.
  • Vertebral level alone was insufficient to identify malposition in two cases.

Related Experiment Videos

  • Malpositioned filters had a significantly smaller mean open leg diameter (19.0 mm) compared to correctly positioned filters (29.9 mm).

    • Conclusions:

    • Filter leg diameter measurement is a more reliable indicator of Greenfield filter malposition than vertebral level.
    • A leg diameter not measuring 30 +/- 4 mm (two standard deviations) warrants suspicion of malposition.