The unanticipated difficult intubation: rigid or flexible endoscope?

Area of Science:

• Anesthesiology
• Airway Management
• Endoscopic Procedures

Background:

• Unanticipated difficult intubation is a significant clinical challenge, occurring in 1.5% to 8.5% of cases.
• Effective management strategies are crucial for patient safety during airway procedures.

Purpose of the Study:

• To compare the preparation time and feasibility of flexible fiberscope (FFI) versus rigid Bonfils endoscope (RBI) for unanticipated difficult intubations.
• To evaluate the efficacy and safety of these two endoscopic approaches in managing challenging airways.

Main Methods:

• A randomized observational study involving 116 patients with unanticipated difficult intubation.
• Patients were managed using either the flexible fiberscope (n=57) or the rigid Bonfils endoscope (n=59).
• Key metrics included preparation time, intubation feasibility, visibility, and complication rates.

Main Results:

• The rigid Bonfils endoscope group demonstrated significantly shorter preparation and intubation times (median 160s) compared to the flexible fiberscope group (median 229s) (P=0.001).
• No significant differences were observed in endoscopic visibility or intubation maneuver quality between the groups (P>0.1).
• Common causes for difficult intubation included restricted neck movement, high Mallampati class, short neck, and reduced thyromental distance. Postoperative complications were comparable between the groups.

Conclusions:

• Both flexible and rigid endoscopic techniques provide quick and safe intubation in difficult airway scenarios.
• The rigid Bonfils endoscope may be preferred for anticipated difficult laryngoscopies in relaxed patients, provided the anesthesiologist is proficient.
• Preoperative assessment for anatomical predictors remains essential for preventing and managing unanticipated intubation difficulties.