A Comparison of the Ease of Tracheal Intubation Using a McGrath MAC Laryngoscope and a Standard MacIntosh Laryngoscope

Study Overview
=================
Brief Summary
-----------------
Videolaryngoscopes offer the potential to make tracheal intubation easier for the anaesthetist and less traumatic for the patient. This study aims to compare the intubation difficulty scores (a validated scoring system for ease of intubation) using the McGrath MAC as a videolaryngoscope, the McGrath MAC only as a direct laryngoscope (without video screen) and the MacIntosh laryngoscopes.

Official Title
-----------------
A Comparison of the Ease of Tracheal Intubation Using a McGrath MAC Laryngoscope and a Standard MacIntosh Laryngoscope

Conditions
-----------------
Tracheal Intubation

Intervention / Treatment
-----------------
* Device: Laryngoscopy


Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: Elective procedure requiring oral tracheal tube intubation Over 16 years of age Airway assessment suggests to the anaesthetist that a standard MacIntosh laryngoscope approach to intubation would be appropriate. Exclusion Criteria: Emergency procedure Less than 16 years of age Unable to consent Requiring Rapid Sequence Induction (a specialised anaesthetic induction technique) Predicted difficult intubation Not suitable for the standardised induction technique

Ages Eligible for Study
-----------------
Minimum Age: 16 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
No

Study Plan
=================
How is the study designed?
-----------------

Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: MacIntosh<br> | Device: Laryngoscopy<br>* After establishing full monitoring, inducing general anaesthesia and ensuring paralysis laryngoscopy is performed and the patient's trachea intubated.<br>|
| Active Comparator: McGrath MAC direct<br> | Device: Laryngoscopy<br>* After establishing full monitoring, inducing general anaesthesia and ensuring paralysis laryngoscopy is performed and the patient's trachea intubated.<br>|
| Active Comparator: McGrath MAC indirect<br> | Device: Laryngoscopy<br>* After establishing full monitoring, inducing general anaesthesia and ensuring paralysis laryngoscopy is performed and the patient's trachea intubated.<br>|

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Intubation Difficulty Score | The Intubation Difficulty Scale (IDS) is a numerical score based on seven parameters. The scoring of each parameter represents a divergence from an 'ideal' condition and the total score represents a sum divergence from a zero difficulty ideal intubation. The seven parameters are number of supplementary attempts, number of supplementary operators, number and type of alternative techniques used, laryngoscopic grade, subjective lifting force, the use of external laryngeal manipulation and mobility or position of the vocal cords. | 5 minutes | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Time to intubation |  | 5 minutes | 
| Number and types of alternative techniques used |  | 5 minutes | 
| Perception of force used |  | 5 minutes | 
| Complications |  | 5 minutes | 
| Ease of intubation |  | 5 minutes | 
| Failure to intubate |  | 5 minutes | 

 Terms related to the study
=================
Keywords Provided by Centre Hospitalier Valida
-----------------
Laryngoscopy, Videolaryngoscopy, Ease of Intubation