Effects Of Ultrasound-guided Superior Laryngeal Nerve Block On Bronchoscopy

Objective:Explore the safety and efficacy of ultrasound-guided superior laryngeal nerve block in bronchoscopy and determine whether it can reduce the incidence of cough and hypoxia in patients during the examination.Methods:80 patients were randomly divided into the experimental group(L group)and the control group(C group)with 40 cases in each group.Group L was performed with the superior laryngeal nerve block under the guidance of ultrasound and cricothyroid membrane puncture,while group C was performed with only cricothyroid membrane puncture.After the completion of procedure,both groups were injected intravenously hydromorphone and propofol.The primary outcomes included the lowest saturation of pulse oxygen,the incidence of hypoxia and the cough score at different stages of bronchoscopy.Secondary outcomes included circulatory system adverse events,vocal cord movement,operation time,Endoscopic physicians' satisfaction,patients' satisfaction,total dose of propofol,lidocaine supplement and patient recovery time ? 9 points.Results:1 There was no significant difference in sex ratio,age,height,weight and body mass index(Body Mass Index,BMI)between the two groups(P>0.05).2 The lowest value of SPO2 in group L was higher than that in group C,and the incidence of hypoxemia in group L was significantly lower than that in group C(P<0.05).When the bronchoscope passed through the supraglottic airway,there was no significant difference in the cough score between the two groups(P>0.05),but when the bronchoscope passed through the glottis,performed examination and bite examination,the cough score in group L was significantly lower than that in group C(P<0.05).3 The patients with open vocal cords in group L were more than those in group C(P<0.05);The operation time,total dose of propofol and lidocaine supplement in group L were significantly lower than those in group C(P<0.05);Endoscopic physicians' satisfaction with anesthesia in group L was significantly higher than that in group C(P<0.05);There was no significant difference between the two groups in the incidence of adverse events in circulatory system,patients' satisfaction and the recovery time taken for Aldrete score ? 9 points(P>0.05).Conclusion:The application of ultrasound-guided superior laryngeal nerve block can reduce the incidence of cough and hypoxia during bronchoscopy,shorten the operation time,improve the satisfaction of operators,and do not increase the pain of patients.