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

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.

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Key information

Conditions

Intubation; Difficult

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

About this study

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.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

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

Exclusion criteria

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

Treatment and study plan

Macintosh laryngoscope

Device

Glottis view assessment by direct visualization using Macintosh laryngoscope

GVL selected by weight

Device

Glottis view assessment by GVL selected by weight which is usually selected first

Other names: GlideScope® videolaryngoscopy selected by weight

smaller sized GVL

Device

Glottis view assessment by GVL which is smaller in one size than GVL selected by age

Other names: smaller sized GlideScope® videolaryngoscopy

Primary outcomes

The Differences in the Glottis View (C&L Grade) of Macintosh Laryngoscope and GVL Selected by Weight.

Time frame: 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 outcomes

The Differences in the Glottis View (C&L Grade) of GVL Selected by Weight and Smaller Sized GVL

Time frame: 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.

Sponsors and collaborators

Lead sponsor

Seoul National University Hospital

Other

Registry information

Important dates

Study start: 2011
Primary completion: 2012
Study completion: 2012
First posted: Jun 12, 2012
Registry last updated: Nov 4, 2014

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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Completed