Time - Related Cuff Pressure and Volume of the Laryngeal Tube With the Use of Nitrous Oxide
The purpose of this study is to investigate the time-related intracuff pressure and volume change (which reflects the pharyngeal pressure) of the LT during anesthesia with N2O.
|Study Design:||Observational Model: Cohort
Time Perspective: Prospective
|Official Title:||Time - Related Cuff Pressure and Volume of the Laryngeal Tube With the Use of Nitrous Oxide|
- intracuff pressure [ Time Frame: 1-4 hours ] [ Designated as safety issue: Yes ]measured intracuff pressure of LT with N2O during intraoperative period
|Study Start Date:||May 2008|
|Study Completion Date:||December 2009|
|Primary Completion Date:||December 2009 (Final data collection date for primary outcome measure)|
intracuff pressure N2O
measured intracuff pressure of LT with N2o during operative period
Device: laryngeal tube (VBM Medizintechnik)
laryngeal tube number 4
Other Name: The laryngeal tube (VBM Medizintechnik, Sulz, Germany)
Background : The laryngeal tube airway (LT) is an extraglottic airway device with a proximal and distal conical cuff designed to secure a patient's airway during either spontaneous breathing or controlled ventilation. Application of this device with the use of N2O may be related to the ischemic change of the oropharyngeal mucosa. The objective of this study was to investigate the time-related intracuff pressure and volume change (which reflects the pharyngeal pressure) of the LT during anesthesia with N2O.
Methods : Seventy-five patients were studied with the use of LT size 4. N2O (66%) and isoflurane were used to maintain anesthesia. Initial intracuff pressure and volume were recorded for airway sealing during ventilation. Time-course changes of the intracuff pressure followed by recording every 10 min. If the intracuff pressure reached 100 cmH2O, the cuff was deflated to the initial intracuff pressure and the volume of deflated air and postoperative airway complications were recorded.