Comparison of lidocaine viscous gargle and topical application on laryngeal mask airway in general anesthesia: A randomized clinical trial

Abstract

Objectives: To investigate the effects and safety of lidocaine viscous gargle on postoperative sore throat (POST) in patients receiving a laryngeal mask airway (LMA) in general anesthesia.

Methods: In this randomized controlled trial, 90 patients undergoing urological surgery were allocated into 2 treatment arms (n=45): lidocaine viscous gargle before LMA insertion (Group G) and topical application of lidocaine viscous on the LMA (Group T). Outcome data were collected before placement of LMA (T0), after insertion of LMA (T1), immediately (T2), one hour (T3), and 24 hours after removal of LMA (T4). We analyzed the incidence of POST, pharynx dryness, and adverse events.

Results: The incidence of POST was lower in Group G than Group T at T2 (11.1% vs. 28.9%; p=0.063), T3 (11.1% vs. 24.4%; p=0.167), and T4 (2.2% vs. 4.4%; p=0.566), but there was no significant difference between groups. No patient in either group experienced severe pain or treatment-related adverse events. There was a significantly lower incidence of pharynx dryness in Group G than Group T (p<0.05) at T2, T3, and T4.

Conclusion: Lidocaine viscous gargle showed no statistically significant difference in incidence of POST and incidence of pharynx dryness compared with topical application of lidocaine on the LMA. Both approaches were safe for patients receiving LMA.Chinese Clinical Trial Register No.: ChiCTR2200059720.

Keywords: administration; intratracheal; intubation; laryngeal masks; lidocaine; pharyngitis; topical.

Figure 1

- Consolidated Standards of Reporting Trials (CONSORT) flow diagram of patient inclusion. Group G: lidocaine viscous gargle, Group T: lidocaine viscous topical application on laryngeal mask airway.