مقايسه تغييرات فشار كاف به وسيله پركردن آن با هوا، ليدوكايين و مخلوط اكسيژن با تايتروس اكسايد در طي بيهوشي عمومي

A comparison change in endotracheal tube cuff pressure between air and Lidocaine and N20 with 02 cuff inflation during general anesthesia

Background&Objective: The Cuff of the endotracheal tube is securing for Mechanical Ventilation during anesthesia. Diffusion of N20 into the Cuff results in an increase in Cuff pressure. The different method was used for the control of Cuff pressure, but may have difficulty and side effect. This study was to determine whether inflating the ETT Cuff with Air, Lidocain 1% or N20 with 02, prevent the increase in Cuff pressure during N20 Anesthesia. Materials&Methods: In this randomized control trial study after obtating ethics committee 224 patients went understudy, these patients divided in two bloks (Sufe, Roach) and the one of the each blok were randomized into three groups. Group, air lidocaine 1% N20 with 02 difficult intubation and the film anesthesia with less than 30-min were excluded. All patients were similarly anesthetized and performed tracheal intubation. The pilot ballon of the endotracheal tube Cuff was connected to a Japanes pressure manometer. The first pressure was measured immediatly and further reading at 10-minute intervals for 70 minutes. The results were readings analysed using T- test, paired t test, Anova and the Chisquar test. A P-value of <0.05 was considered significant. Results: Cuff pressure increased gradually during anesthesia in-group air but remained stable in groupʹs lidocaine and N20 with 02. The Cuff pressure had significant differences between the supa and Roach groups in all of the times during anesthesia (P<0.05). Conclusion: Inflating the ETT Cuff with lidocaine 1% or N20/ oxygen mixtures are methods of keeping intracuff pressure stable during N20 anesthesia due to N20 diffusion the Cuff tube causes increase the Cuff pressure. We suggest that continious monitoring of the UCP during anesthesia to be carried out.