Effect of Head Rotation on Efficiency of Face Mask Ventilation in Anesthetized Apneic Adults

Effect of Head Rotation on Efficiency of Face Mask Ventilation in Anesthetized Apneic Adults: A Prospective Randomized Crossover Study

Status

Completed

Phases

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT02755077

Enrollment

Registered

2016-04-28

Start date

2014-07-31

Completion date

2016-01-31

Last updated

2016-04-28

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Anesthesia

Keywords

Anesthesia induction, Airway, Mask ventilation

Brief summary

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.

Detailed description

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.

Interventions

PROCEDUREHead rotation during mask ventilation

Patient's head position is axially rotated 45 degrees to the right.

Study design

Allocation

RANDOMIZED

Intervention model

CROSSOVER

Masking

NONE

Eligibility

Sex/Gender

ALL

Age

18 Years to 75 Years

Healthy volunteers

Inclusion criteria

* Patients with body mass index in the range of 18.5 to 35.0 kg/m2, who meet American society of anesthesiologists physical status classification I to III and require general anesthesia with tracheal intubation.

Exclusion criteria

* Patients with limited head rotation/extension, gastro-esophageal reflux or a full stomach, known sleep apnea in continuous positive airway pressure therapy and any anticipated difficult airway likely requiring awake intubation.

Design outcomes

Primary

Measure	Time frame	Description
Change in averaged expiratory tidal volume measured by Respiratory monitor	1, 2 and 3 min after the initiation of mask ventilation	Change in tidal volume between data of 2 min and average data from 1 and 3 min

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 28, 2026