Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2024 Feb 15;14(2):209.
doi: 10.3390/jpm14020209.

Influence of Curved Video Laryngoscope Blade Sizes and Patient Heights on Video Laryngoscopic Views: A Randomized Controlled Trial

Jong-Ho Kim  1   2 , Bo-Reum Cheon  1 , Hyesook Kim  2 , Sung-Mi Hwang  1 , Jae-Jun Lee  1   2 , Young-Suk Kwon  1   2
Affiliations

Influence of Curved Video Laryngoscope Blade Sizes and Patient Heights on Video Laryngoscopic Views: A Randomized Controlled Trial

Jong-Ho Kim et al. J Pers Med. .

Abstract

This study aimed to compare the video laryngoscope views facilitated by curved blades 3 and 4 with an exploration of the relationship between these views and patient height. Conducted as a randomized controlled trial, this study enrolled adults scheduled for surgery under general anesthesia. Intubation procedures were recorded, and the percentage of glottic opening was measured before tube insertion. Multivariate analysis validated the impact of various factors, including blade size and patient height, on the percentage of glottic opening scores. A total of 192 patients were included. The median percentage of glottic opening scores for curved blades 3 and 4 were 100 and 83, respectively (p < 0.001). The unstandardized coefficient indicated a significant negative impact of blade 4 on the percentage of glottic opening scores (-13, p < 0.001). In the locally estimated scatterplot smoothing analysis, blade 3 exhibited a steady rise in glottic opening scores with increasing height, whereas blade 4 showed a peak followed by a decline around 185 cm. The unstandardized coefficient of height showed no significant association (0, p = 0.819). The study observed superior laryngoscopic views with blade 3 compared to blade 4. However, no significant association was found between laryngoscopic views and patient height.

Keywords: body height; endotracheal intubation; laryngoscope; randomized controlled trial; video-assisted techniques.

PubMed Disclaimer

Conflict of interest statement

The authors declare no conflicts of interest.

Figures

Figure 1
Figure 1
Video laryngoscopy and blade. (A) Video laryngoscope; (B) curved video laryngoscope blade 3; and (C) curved video laryngoscope blade 4.
Figure 2
Figure 2
BURP maneuver. BURP: Backwards, Upwards, Rightwards, and Pressure.
Figure 3
Figure 3
Flow chart.
Figure 4
Figure 4
Distribution of percentage of glottic opening scores according to blade size. (A) Blade 3 and (B) blade 4.
Figure 5
Figure 5
Relationship between patient height and percentage of glottic opening score according to blade size. The dots are scatterplots of patient height and percentage of glottic opening score. The lines are estimated scatterplot smoothing lines. POGO, percentage of glottic opening.
See this image and copyright information in PMC

Similar articles

See all similar articles

Cited by

References

    1. Perkins E.J., Begley J.L., Brewster F.M., Hanegbi N.D., Ilancheran A.A., Brewster D.J. The use of video laryngoscopy outside the operating room: A systematic review. PLoS ONE. 2022;17:e0276420. doi: 10.1371/journal.pone.0276420. - DOI - PMC - PubMed
    1. Sakles J.C., Mosier J., Hadeed G., Hudson M., Valenzuela T., Latifi R. Telemedicine and telepresence for prehospital and remote hospital tracheal intubation using a GlideScope™ videolaryngoscope: A model for tele-intubation. Telemed. e-Health. 2011;17:185–188. doi: 10.1089/tmj.2010.0119. - DOI - PubMed
    1. de Carvalho C.C., da Silva D.M., Lemos V.M., Dos Santos T.G.B., Agra I.C., Pinto G.M., Ramos I.B., Costa Y.S.C., Santos Neto J.M. Videolaryngoscopy vs. direct Macintosh laryngoscopy in tracheal intubation in adults: A ranking systematic review and network meta-analysis. Anaesthesia. 2022;77:326–338. doi: 10.1111/anae.15626. - DOI - PubMed
    1. Saul S.A., Ward P.A., McNarry A.F. Airway management: The current role of videolaryngoscopy. J. Pers. Med. 2023;13:1327. doi: 10.3390/jpm13091327. - DOI - PMC - PubMed
    1. Tippmann S., Schäfer J., Winter J., Mühler A.-K., Schmitz K., Schönfeld M., Eichinger M., Mildenberger E., Kidszun A. Video versus direct laryngoscopy to improve the success rate of nasotracheal intubations in the neonatal intensive care setting: A randomised controlled trial. BMJ Paediatr. Open. 2023;7:e001958. - PMC - PubMed

LinkOut - more resources