Residual Vocal Cords Curarization Correlation Between Clinical and Ultrasound Endpoints

The investigators conducted an analytical prospective observational and comparative study between March 2022 and May 2022. The investigators included all patients proposed for elective surgery under general anesthesia with Tracheal intubation other than ENT surgery, ages 18 to 70 years, consenting, classified ASA class I, II, or III, with no history of difficult intubation and/or ventilation, divided into two groups that differ by neostigmine use: group A: systematic decurarization, group B: extubation through clinical criteria. Ultrasound assessments of the vocal cords were performed at 3 different time points: before induction (T0), after extubation (T1), in SSPI 30 minutes after extubation (T2). The investigators have defined H0, H1 and H2, the maximum amplitudes of the vocal cords measured respectively at T0, T1 and T2. The primary endpoint was the ultrasound judged vocal cord range of motion with a ratio of pre- to post curarization amplitude defining the HA score, calculated using the following formulas: H0-H1, H0-H2, HAt1=H1/H0, HAt2=H2/H0. The investigators conducted a single then multi-variate analysis.