اثر تزريق ليدوكايين داخل لوله تراشه بر ميزان بروز سرفه و اسپاسم حنجره

Effect of lidocaine injection via endotracheal tube on incidence of cough and laryngospasm

Aims: Coughing during anesthesia or after tracheal extubation is unwanted and possible to be harmful in patients under cataract operation and cause damages to eye or finally blindness. The goal of this study was to determine the effect of lidocaine injection via endotracheal tube before extubation in decrease of incidence of cough and laryngospasm comparing to normal method. Methods: This is a double blind randomized clinical trial study, performed for 6 months in Yasouj Emam-Sajad Hospital on 66 above 18 year-old candidates of cataract operation. In test group, 100 mg (5ml) of lidocaine 2% and in control group, same volume of placebo (normal salin) injected via endotracheal tube. Using anesthesia drugs stoped 5 to 10 minutes before end of the surgery and after ending the operation extubation took place. The number of coughs and laryngospasm assessed, recorded and compared in three periods. Collected data analysed using SPSS 11 software. Results: Systolic and diastolic blood pressure before operation, after extubation in operation room and in recovery room did not show a significant different between control and test group. Number of coughs were higher in control group and the difference between 2 groups were significant. Conclusion: Injection of lidocaine via endotracheal tube in patients under cataract operation reduces coughing after extubation.