Does the timing of tracheal intubation based on neuromuscular monitoring decrease laryngeal injury? A randomized,...

Area of Science:

• Anesthesiology
• Surgical Complications
• Patient Safety

Background:

• Vocal cord injuries (VCI) and postoperative hoarseness (PH) are common after general anesthesia.
• Poor muscle relaxation during tracheal intubation can cause VCI.
• Individual responses to neuromuscular blocking drugs vary, suggesting timing of intubation is crucial.

Purpose of the Study:

• To investigate if tracheal intubation timed by neuromuscular monitoring reduces VCI and PH.
• To compare intubating conditions using neuromuscular monitoring versus a fixed time interval.

Main Methods:

• Prospective randomized trial with 60 patients.
• Two groups: neuromuscular monitoring for intubation timing vs. fixed 2-minute interval after atracurium.
• Evaluated intubating conditions (Copenhagen score), VCI (stroboscopy), and PH (standardized interview).

Main Results:

• Excellent intubating conditions were significantly higher in the monitoring group (8 vs. 2 patients, P=0.036).
• Incidence of PH was comparable between groups (7 vs. 8 patients, P=0.860).
• VCI incidence was similar (9 vs. 5 patients, P=0.268), with no significant difference in VCI types.

Conclusions:

• Neuromuscular monitoring enhances endotracheal intubating conditions.
• Tracheal intubation timed at maximum neuromuscular block did not decrease vocal cord injuries.
• Current findings suggest improved intubation quality but not reduced VCI incidence.