Encountering unexpected difficult airway: relationship with the intubation difficulty scale

Area of Science:

• Anesthesiology
• Airway Management
• Patient Safety

Background:

• Unexpected difficult intubation poses significant risks to patients.
• The Intubation Difficulty Scale (IDS) is a validated tool for assessing intubation difficulty.
• Understanding the prevalence and characteristics of unexpected difficult intubation is crucial.

Purpose of the Study:

• To evaluate the prevalence of unexpected difficult intubation.
• To characterize the contributing factors of unexpected difficult intubation.
• To utilize the Intubation Difficulty Scale (IDS) for assessment.

Main Methods:

• Retrospective review of 951 patients undergoing elective surgery.
• Exclusion of patients with anticipated or prior difficult intubation.
• Assessment using the seven-variable Intubation Difficulty Scale (IDS).

Main Results:

• 5.8% of patients (n=55) experienced unexpected difficult intubation (IDS > 5).
• 16.2% of patients (n=154) had Cormack-Lehane Grade 3 or 4.
• Most difficult intubations were managed with simple maneuvers like stylet use and laryngeal pressure.

Conclusions:

• Unexpected difficult airways occur in 5.8% of cases and are generally manageable.
• The Cormack-Lehane grade is the most sensitive predictor within the IDS.
• Effective management strategies exist for unexpected difficult intubations.