Observation Of The Effect Of Superior Laryngeal Nerve Block For Patients Undergoing Upper Gastrointestinal Endoscopic Ultrasound Examination

Objective:To explore the safety and effectiveness of superior laryngeal nerve block in endoscopic ultrasonography of upper digestive tract.Methods:Collected 80 patients,regardless of gender,age 18 to 65 years old,with body mass index（BMI）<30kg/m²,ASA grade I or II,were selected for upper gastrointestinal endoscopic ultrasonography.All the enrolled patients were randomized into groups.40 cases were enrolled as the experimental group（superior laryngeal nerve block group）and 40 cases as the control group.Before examination,both groups were given dyclonine 10 ml for oropharyngeal surface anesthesia,and during anesthesia induction,both groups were given propofol by BIS monitoring closed-loop targeting-controlled infusion pump.The experimental group treated with ultrasound-guided medial ramus of superior laryngeal nerve block immediately after induction,while the control group did not treated accordingly.During anesthesia maintenance,propofol were treated with propofol to maintain BIS between 40 to 60.Recorded heart rate（HR）,mean arterial pressure（MAP）,blood oxygen saturation（Sp O₂）and BIS changes at each time point,total dosage of propofol and operation duration were recorded,recovery quality and recovery time were recorded according to Modified Observer’s Assessment of Alertness/Sedation Scale（MOAAS）score.Recorded the number of adverse events and the satisfaction of the operator and the client.Results:Compared with the control group,the total amount of propofol used in the experimental group decreased,the airway intervention decreased,the incidence of hypoxemia was lower,and the patient satisfaction was higher（p<0.05）.No serious cardiovascular complications,intraoperative awareness or regurgitation were observed in both groups.Conclusion:Comprehensive indicators,laryngeal nerve block techniques is safe and effective in endoscopic ultrasound examination of upper digestive tract,which can reduce the dosage of general anesthesia drugs,maintain the stability of hemodynamics during examination,reduce the incidence of hypoxemia,reduce airway intervention,and not increase the incidence of postoperative adverse reactions,and can obtain higher satisfaction,improve the quality of throat anesthesia and enhance the tolerance of subjects during examination.