Adult Disease Clinical Trial
Official title:
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.
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.
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