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Related Experiment Videos

Defining a standard intubating position using "angle finder".

W A Horton1, L Fahy, P Charters

  • 1Royal Liverpool Hospital.

British Journal of Anaesthesia
|January 1, 1989
PubMed
Summary
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A new standard intubating position, using the Angle Finder instrument, aids direct laryngoscopy for patients with difficult airways. This reproducible geometric standard of 35-degree neck flexion and 15-degree face extension improves intubation success.

Area of Science:

  • Anesthesiology
  • Airway Management
  • Medical Device Technology

Background:

  • Direct laryngoscopy can be challenging in patients with subtle anatomical abnormalities.
  • Standardized patient positioning is crucial for optimizing airway visualization during intubation.
  • Existing methods for achieving optimal laryngoscopy positioning lack a simple, reproducible geometric standard.

Purpose of the Study:

  • To introduce and validate a novel, reproducible geometric standard for patient positioning during direct laryngoscopy.
  • To assess the utility of the "Angle Finder" instrument in establishing this standard.
  • To evaluate the standard's applicability in clinical practice and teaching for difficult airway scenarios.

Main Methods:

  • A literature review was conducted to derive an initial geometric standard for the intubating position.

Related Experiment Videos

  • The standard, involving specific angles for neck flexion (35°) and face extension (15°) relative to horizontal for a supine patient using a Macintosh laryngoscope blade, was defined.
  • Validation involved assessing senior anesthetists' practices, testing reproducibility in volunteers, and evaluating appropriateness in patients with a history of difficult laryngoscopy.

    • Main Results:

    • The proposed geometric standard was successfully derived and validated.
    • The "Angle Finder" instrument facilitated easy implementation of the standard.
    • The standard demonstrated reproducibility in normal volunteers and appropriateness in patients with difficult direct laryngoscopy.

    Conclusions:

    • A simple, reproducible geometric standard for direct laryngoscopy positioning has been established.
    • This standard, facilitated by the "Angle Finder", offers a practical tool for improving airway management in clinical settings and education.
    • The defined positioning can aid anesthesiologists in achieving better laryngeal visualization, particularly in patients with anticipated difficult airways.