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Related Experiment Videos

Variations in ILMA external diameters: another cause of device failure.

C Preis1, C Czerny, I Preis

  • 1Department of Anestehsiology and General Intensive Care, University of Vienna, Austria. carsten.preis@univie.ac.at

Canadian Journal of Anaesthesia = Journal Canadien D'Anesthesie
|September 16, 2000
PubMed
Summary

Intubating laryngeal mask airways (ILMAs) failed insertion in a patient with limited mouth opening due to insufficient device compressibility. Variations in ILMA design impacted successful airway management.

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Area of Science:

  • Anesthesiology
  • Medical Device Engineering

Background:

  • Airway management is critical in anesthesia.
  • Intubating laryngeal mask airways (ILMAs) are commonly used devices for securing the airway.
  • Limited mouth opening can pose challenges during airway management.

Observation:

  • Insertion of size #5 and #4 ILMAs failed in a patient with a mouth opening just under 25 mm.
  • Standard insertion techniques and maneuvers were unsuccessful.
  • A size #4 LMA was successfully used as a conduit for fiberoptic intubation.

Findings:

  • The failed ILMAs lacked sufficient compressibility, preventing insertion.
  • Radiological examination revealed thicker silicone layers and less beveled steel tubes in the failed devices compared to standard ones.

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  • Manufacturer's stated maximal outer dimension of 20 mm was not met by the failed devices.

    • Implications:

    • Device variability can impact clinical success in patients with restricted mouth opening.
    • Anesthesiologists should be aware of potential ILMA compressibility issues.
    • Further investigation into ILMA manufacturing consistency is warranted for patient safety.