Evaluation of McGrath® MAC Video Laryngoscope

Study Overview
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Brief Summary
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The purpose of this study is to evaluate whether the McGrath® MAC video laryngoscope is equal or superior when compared to the Glidescope® Ranger and the Macintosh laryngoscope for novice users in a simulated airway manikin.

Detailed Description
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Investigators compared two portable video laryngoscopes (the GlidesScope® Ranger (Verathon Inc, Bothell, WA, USA) and the McGrath® MAC (Aircraft Medical Ltd, Edinburgh, UK)) and a German type Macintosh metal blade with a fiberoptic light. A blade size of 4 was used on all devices. All intubations using video laryngoscopes were performed according to the manufacturers' instructions. A specialised rigid stylet (the GlideRite®) was used with the Glidescope® and a flexible plastic stylet bent with a hockey stick curvature, was used with the McGrath® MAC and the Macintosh laryngoscope. A size 7.5 endotracheal tube (Mallinckrodt™ Hi-Lo Oral/Nasal Tracheal Tube Cuffed Murphy Eye, Covidien, Ireland) was used with all the laryngoscopes. All participants were randomly divided into 3 device groups. Each group was allowed to attempt to perform endotracheal intubation five more times using the Laerdal® Airway Management Trainer (Laerdal Medical Korea Ltd., Seoul, Korea) with the normal airway setting. After completing the normal airway session, the participants performed another five attempts with the neck immobilisation setting using a neck collar. The sequence in which the three devices were used was randomly assigned, and all participants performed the same sequence at intervals of five weeks during the study.

Official Title
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Evaluation of McGrath® MAC Using Glidescope® Ranger for Novice Providers in a Simulated Difficult Airway: A Randomised Manikin Study

Conditions
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Intubation; Difficult

Intervention / Treatment
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* Device: the McGrath® MAC video laryngoscope
* Device: the GlidesScope® Ranger video laryngoscope
* Device: the Macintosh laryngoscope


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Medical students without previous experience of intubation Exclusion Criteria: Heart, wrist, or low back disease or who were pregnant were excluded

Ages Eligible for Study
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Minimum Age: 22 Years
Maximum Age: 33 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Basic Science
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Intubation with the McGrath® MAC video laryngoscope<br>Participants perform five intubation attempts using the airway manikin with the normal airway setting. After completing the normal airway session, the participants performed another five attempts with the neck immobilization setting using a neck collar. | Device: the McGrath® MAC video laryngoscope<br> <br> Device: the GlidesScope® Ranger video laryngoscope<br> <br> Device: the Macintosh laryngoscope<br> <br> |
| Experimental: Intubation with the GlidesScope® Ranger video laryngoscope<br>Participants perform five intubation attempts using the airway manikin with the normal airway setting. After completing the normal airway session, the participants performed another five attempts with the neck immobilization setting using a neck collar. | Device: the McGrath® MAC video laryngoscope<br> <br> Device: the GlidesScope® Ranger video laryngoscope<br> <br> Device: the Macintosh laryngoscope<br> <br> |
| Experimental: Intubation with Macintosh laryngoscope<br>Participants perform five intubation attempts using the airway manikin with the normal airway setting. After completing the normal airway session, the participants performed another five attempts with the neck immobilization setting using a neck collar. | Device: the McGrath® MAC video laryngoscope<br> <br> Device: the GlidesScope® Ranger video laryngoscope<br> <br> Device: the Macintosh laryngoscope<br> <br> |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Intubation parameter | The rate for successful intubation Time to intubation The Cormack-Lehane grade at laryngoscopy | 1st intubation attempt, an expected average of 1 min | 
| Intubation parameter | The rate for successful intubation Time to intubation The Cormack-Lehane grade at laryngoscopy | 2nd intubation attempt, an expected average of 1 min | 
| Intubation parameter | The rate for successful intubation Time to intubation The Cormack-Lehane grade at laryngoscopy | 3rd intubation attempt, an expected average of 1 min | 
| Intubation parameter | The rate for successful intubation Time to intubation The Cormack-Lehane grade at laryngoscopy | 4th intubation attempt, an expected average of 1 min | 
| Intubation parameter | The rate for successful intubation Time to intubation The Cormack-Lehane grade at laryngoscopy | 5th intubation attempt, an expected average of 1 min | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Intubation, Laryngoscopes