Sublingual ultrasound as an assessment method for predicting difficult intubation: a pilot study

Area of Science:

• Anesthesiology
• Medical Imaging
• Airway Management

Background:

• Current methods for predicting difficult airways before tracheal intubation have limitations in accuracy.
• There is a need for improved tools to enhance patient safety during intubation procedures.

Purpose of the Study:

• To investigate the efficacy of sublingual ultrasound as an adjunct to conventional methods for predicting difficult airways.
• To determine if sublingual ultrasound provides additional predictive value compared to existing techniques.

Main Methods:

• 110 patients self-performed sublingual ultrasound after instruction.
• Evaluated hyoid bone visibility via ultrasound, alongside mouth opening, thyromental distance, neck mobility, mandible size, and modified Mallampati classification.
• Assessed the predictive ability of each method for difficult intubation based on laryngoscope grade.

Main Results:

• Sublingual ultrasound visibility of the hyoid bone strongly correlated with easier laryngoscopic grades (1-2, p < 0.0001).
• Hyoid bone visibility demonstrated a high positive likelihood ratio (21.6) and a low negative likelihood ratio (0.28).
• Conventional methods exhibited significantly lower positive likelihood ratios and reduced sensitivity in predicting difficult airways.

Conclusions:

• Sublingual ultrasound shows promise as a valuable tool for predicting difficult airways.
• This imaging technique can supplement existing clinical assessments, potentially improving intubation success rates.
• Further research may establish sublingual ultrasound as a standard component of pre-intubation airway evaluation.