Upper airway obstruction commonly occurs after induction of general anesthesia. The aim of this study is to determine if head rotation improves the efficiency of mask ventilation of anesthetized apneic adults.
When apnea is achieved after induction, face mask ventilation is started in either a neutral head position or a head position axially rotated 45 degrees to the right. Mask ventilation will be carried out for 1 minute (Step 1) with pressure control ventilation of an anesthesia machine at peak inspiratory pressure 15 cmH2O, 10 breaths per minute, inspiration time to expiration time ratio 1:2 and no positive end-expiratory pressure. Then, mask ventilation will continue but head position will be crossed over (Step 2) and Step 1 will be repeated (Step 3). Expiratory tidal volume (VTE) will be measured by using respiratory inductive plethysmograph.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Masking
NONE
Enrollment
40
Patient's head position is axially rotated 45 degrees to the right.
Change in averaged expiratory tidal volume measured by Respiratory monitor
Change in tidal volume between data of 2 min and average data from 1 and 3 min
Time frame: 1, 2 and 3 min after the initiation of mask ventilation
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