Morphological specificity analysis of an image-based 3D model of airway filling in a difficult airway

Wendong Chen, Li Ma, Jianlin Shao, Chun Bi, Yuchen Xie, Shuangyan Zhao, Wendong Chen, Li Ma, Jianlin Shao, Chun Bi, Yuchen Xie, Shuangyan Zhao

Abstract

Background: The purpose of this study was to analyze position-specific morphological changes of the upper airway and to further assess the impact of these changes in difficult airway during intubation.

Methods: This observational comparative study included two groups (n = 20 patients/group): Group A had normal airway and Group B had difficult airway. Data obtained from two-dimensional magnetic resonance imaging were imported to Mimics V20.0 software for processing. We then reconstructed three-dimensional models of upper airway filling in patients in the supine and maximum extension position based on the imaging data. Those models were projected on coronal, sagittal, and horizontal planes to investigate multiple morphological features. We measured the surface area, radial length, and corner angle of the projected areas.

Results: Group A had larger upper airway filling volumes compared to Group B The volumes for the supine position were 6,323.83 ± 156.06 mm3 for Group A and 5,336.22 ± 316.13 mm3 for Group B (p = 0.003). The volumes the maximum extension position were 9,186.58 ± 512.61 mm3 for Group A and 6,735.46 ± 794.63 mm3 for Group B (p = 0.003). Airway volume increased in the upper airway filling model as the body position varied from the supine to maximum extension position (Group A: volume increase 2,953.75 ± 524.6 mm3, rate of change 31%; Group B: volume increase 1,632.89 ± 662.66 mm3, rate of change 25%; p = 0.052).

Conclusion: The three-dimensional reconstruction model developed in this study was used to digitally quantify morphological features of a difficult airway and could be used as a novel airway management assessment tool.

Keywords: Difficult airway; Morphological; Three-dimensional model; Upper airway.

Conflict of interest statement

Authors state no conflict of interest.

© 2022. The Author(s).

Figures

Fig. 1
Fig. 1
3D model of filling of the upper airway in (A) the supine position and (B) the maximum extension position
Fig. 2
Fig. 2
2D projection and data measurement of a 3D model of upper airway filling in the coronal plane
Fig. 3
Fig. 3
2D projection and data measurement of a 3D model of upper airway filling in the sagittal plane
Fig. 4
Fig. 4
2D projection and data measurement of a 3D model of upper airway filling in the horizontal plane. Note: Volume in Group A is represented as V1a and V2a; volume in Group B is represented as V1b and V2b

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