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