GlideScope®Video Laryngoscope for Difficult Intubation: Implication of the Size of Blade

Not Applicable

Completed

• Conditions: Intubation; Difficult
• Interventions: Device: Macintosh laryngoscope; Device: GVL selected by weight; Device: smaller sized GVL

• Registration Number: NCT01616771
• Lead Sponsor: Seoul National University Hospital

Brief Summary

The investigators evaluated the usefulness of the Glidescope(GVL) compared with direct laryngoscopy in patients whose airway management are anticipated difficult (C\&L grade ≥3) by comparing the laryngoscopic view. Also, the investigators compared the effectiveness of smaller-size blade of GVL (GVLs) with standard blade of GVL selected by patient's weight (GVLw) in the same patients.

Detailed Description

We assumed that smaller sized GVL can slide more angulated along the tongue, so the tip of a blade can be placed more anterior and cephalad. The angle of camera would be optimized by inserting the blade further with the blade tip directed toward the larynx. This optimization may be more remarkable with smaller blade because it can be inserted with rotation. Furthermore, the location and the angle of camera are different according to GVL blade size. Considering that patient with difficult airway has hypognathia and more cephalad larynx, it may be helpful with smaller sized GVL (GVLs) rather than GVL selected by weight (GVLw) for improvement of laryngoscopic view in patients with difficult airways. We hypothesized that GVLs can provide better laryngoscopic view than GVLw and DL in patient with difficult airway.

Basic Information
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Recruitment & Eligibility
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Study & Design

Study Timeline

• Study Start: 2011-02
• Primary Completion: 2012-01
• Study Completion: 2012-01
• Study First Submitted: 2012-04-30
• Study First Submitted QC: 2012-06-11
• Study First Posted: 2012-06-12
• Results First Submitted: 2013-11-21
• Results First Submitted QC: 2014-10-27
• Status Verified: 2014-11
• Results First Posted: 2014-11-02
• Last Update Submitted: 2014-11-03
• Last Update Posted: 2014-11-04

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 23

Inclusion Criteria

• Patients whose C&L grade were over 3 in previous anesthetic records.

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Exclusion Criteria

• Patients with pulmonary aspiration, increased intracranial pressure, and severe cardiovascular disease

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
glottis view assessment	smaller sized GVL	Glottis view assessment using Macintosh laryngoscope \& GVL selected by weight \& smaller sized GVL in single patient
glottis view assessment	Macintosh laryngoscope	Glottis view assessment using Macintosh laryngoscope \& GVL selected by weight \& smaller sized GVL in single patient
glottis view assessment	GVL selected by weight	Glottis view assessment using Macintosh laryngoscope \& GVL selected by weight \& smaller sized GVL in single patient

Primary Outcome Measures

Name	Time	Method
The Differences in the Glottis View (C&L Grade) of Macintosh Laryngoscope and GVL Selected by Weight.	up to 1 day of surgery	Glottis view was scored using C\&L grade by Macintosh laryngoscope and GVL selected by weight, and compared each other.; We used modified C\&L grade: grade 1, all or most of the glottic aperture was visible; grade 2a, posterior cords and cartilage visible; grade 2b, only posterior cartilage visible; grade 3a, epiglottis visible and can be lifted; grade 3b, epiglottis adherent to the posterior pharynx; and grade 4, the epiglottis could not be visualized.; For the statistical analysis, the modified C\&L grade was converted to an ordinal scale; grade 1 to 1, grade 2a to 2, grade 2b to 3, grade 3a to 4, grade 3b to 5, and grade 4 to 6. Therefore, score range for the data reported in the table was between 1 and 6, with 1 representing best view and 6 representing no view.

Secondary Outcome Measures

Name	Time	Method
The Differences in the Glottis View (C&L Grade) of GVL Selected by Weight and Smaller Sized GVL	up to 1day of surgery	Glottis view was scored using C\&L grade by GVL selected by weight and smaller sized GVL, and compared each other.; Score range for the data reported in the table was between 1 and 6, with 1 representing best view and 6 representing no view.