Improvement of the Glottic View by Video Laryngoscope

• Conditions: Intubation; Laryngoscopy; Laryngoscope
• Interventions: Device: Video laryngoscopic view; Device: Direct laryngoscopic view

• Registration Number: NCT04620434
• Lead Sponsor: Seoul National University Hospital

Brief Summary

This study aims to compare the exposure of glottis by the use of video and direct laryngoscopy.

Detailed Description

It is well known that a video laryngoscope can provide better glottic view than a direct laryngoscope. However, to date, a direct laryngoscope has been the standard equipment for tracheal intubation. Recently, it seems that use of the video laryngoscope has increased. However, the advantage of the video laryngoscope over a direct laryngoscope has not been measured quantitatively. In this study, the glottic view by the use of video laryngoscope will be compared with that of the direct laryngoscope simultaneously, by using C-MAC S-imager installed with a disposable Macintosh blade. Intubating anesthesiologists will use it as if it is a direct laryngoscope. Simultaneously, the glottic views visualized on the monitor of the video laryngoscope will be recorded and evaluated later. For quantitative comparison, the glottic view will be scored with the Percentage of glottic opening scale, for both direct laryngoscopy and video laryngoscopy. Also, the glottic view will be compared by Cormack-Lehane grade.

Study Timeline

• Study First Submitted: 2020-11-03
• Study First Submitted QC: 2020-11-03
• Study First Posted: 2020-11-09
• Study Start: 2021-06-23
• Status Verified: 2021-11
• Primary Completion: 2021-11
• Last Update Submitted: 2021-11-15
• Last Update Posted: 2021-11-17
• Study Completion: 2021-12

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: All
• Target Recruitment: 39

Inclusion Criteria

• Patients who are over 18 years old, and are planning surgeries that require general anesthesia and tracheal intubation.

Exclusion Criteria

• Patients who are not agreed to participate in the trial
• Patients who have a poor dental condition which requires other than direct laryngoscopy
• Patients who require rapid sequence induction technique
• Patients with cervical spine instability

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Arm && Interventions

Group	Intervention	Description
patient	Video laryngoscopic view	39 patients who are planning surgeries that require general anesthesia and tracheal intubation
patient	Direct laryngoscopic view	39 patients who are planning surgeries that require general anesthesia and tracheal intubation

Primary Outcome Measures

Name	Time	Method
POGO (Percentage of Glottic Opening) score	during laryngoscopy	POGO (Percentage of Glottic Opening) score of the glottic view by video/direct laryngoscope during laryngoscopy without external laryngeal manipulation. (Percentage of glottic opening score, which means a better outcome at higher score: linear span from the anterior commissure to the interarytenoid notch; 0%, only interarytenoid notch seen; 100% full view of vocal cords)
Cormack-Lehane grade	during laryngoscopy	Cormack-Lehane grade with video/direct laryngoscope, during laryngoscopy without external laryngeal manipulation (Cormack-Lehane grade, which means a better outcome at lower score: grade 1, Full view of glottis; grade 2a, Partial view of glottis; grade 2b, Only posterior extremity of glottis or arytenoid cartilages; grade 3, Only epiglottis seen; grade 4, Neither glottis nor epiglottis seen)

Secondary Outcome Measures

Name	Time	Method
Cormack-Lehane grade with external laryngeal manipulation	during laryngoscopy	Cormack-Lehane grade with video/direct laryngoscope, during laryngoscopy with external laryngeal manipulation. (Cormack-Lehane grade, which means a better outcome at lower score: grade 1, Full view of glottis; grade 2a, Partial view of glottis; grade 2b, Only posterior extremity of glottis or arytenoid cartilages; grade 3, Only epiglottis seen; grade 4, Neither glottis nor epiglottis seen)
POGO score with external laryngeal manipulation	during laryngoscopy	POGO score of the glottic view by video/direct laryngoscope during laryngoscopy with external laryngeal manipulation. (Percentage of glottic opening score, which means a better outcome at higher score: linear span from the anterior commissure to the interarytenoid notch; 0%, only interarytenoid notch seen; 100% full view of vocal cords)

Trial Locations

Locations (1)

SMG-SNU; 🇰🇷 Seoul, Korea, Republic of