King Vision® and GlideScope® in Difficult Airways

Study Overview
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Brief Summary
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There are several advantages of video laryngoscopy; especially their ability to provide superior glottis visualization, as compared to traditional laryngoscopy.1-3 The purpose of this three arm study was to compare the safety and efficacy of the King Vision® Video Intubation Systems (AMBU-King Systems, Denmark) to the Cobalt GlideScope® (Verathon Medical Inc., USA) in patients with anticipated difficult airways.

Official Title
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A Comparison of the King Vision® Channeled, King Vision® Non-Channeled, and Glidescope® Video Intubation Systems in Patients at Risk for Difficult Intubation - A Pilot Study

Conditions
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Airway Management

Intervention / Treatment
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* Device: Video laryngoscopes


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Over 18 years of age Mallampati III-IV Neck circumference > 43cm Reduced mouth opening (< 4cm) or 3 Finger breath's (patient's own) Thyromental distance < 6cm Exclusion Criteria: Mallampati I-II Neck circumference < 43cm Documented 'easy' intubation Previous history of failed intubation and failed bag-mask ventilation Under 18 years of age ASA IV Known unstable cervical spine injury Presentation for an emergency surgical procedure

Ages Eligible for Study
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Minimum Age: 18 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: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Glidescope AVL<br> | Device: Video laryngoscopes<br>* Patients were randomized into one of the three groups through a computer generated randomization schedule. Patients in group A (N= 75) will be intubated using the GlideScope® AVL, patients in group B (N= 75) will be intubated using the King Vision Channeled VL; patients in group C (N=75) will be intubated using the King Vision Video Laryngoscope with Standard (non-channeled) Blade. Patients will only be tested with one device. All patients will be intubated using a conventional ETT.<br>|
| Experimental: King Vision Channeled VL<br> | Device: Video laryngoscopes<br>* Patients were randomized into one of the three groups through a computer generated randomization schedule. Patients in group A (N= 75) will be intubated using the GlideScope® AVL, patients in group B (N= 75) will be intubated using the King Vision Channeled VL; patients in group C (N=75) will be intubated using the King Vision Video Laryngoscope with Standard (non-channeled) Blade. Patients will only be tested with one device. All patients will be intubated using a conventional ETT.<br>|
| Experimental: King Vision Non-Channeled (Standard) VL<br> | Device: Video laryngoscopes<br>* Patients were randomized into one of the three groups through a computer generated randomization schedule. Patients in group A (N= 75) will be intubated using the GlideScope® AVL, patients in group B (N= 75) will be intubated using the King Vision Channeled VL; patients in group C (N=75) will be intubated using the King Vision Video Laryngoscope with Standard (non-channeled) Blade. Patients will only be tested with one device. All patients will be intubated using a conventional ETT.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Overall Successful Tracheal Intubation for All 3 Video Laryngoscopes - GSAVL, KVChVL and KVNChVL | The overall intubation success rates for all 3 video laryngoscopes - GSAVL, KVChVL and KVNChVL | During laryngoscopy and endotracheal tube placement | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| First-attempt Successful Intubation for All 3 Video Laryngoscopes - GSAVL, KVChVL and KVNChVL | The overall first-attempt success rates for all 3 video laryngoscopes - GSAVL, KVChVL and KVNChVL | During laryngoscopy and endotracheal tube placement |