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Anesthesiology Research and Practice
Volume 2010 (2010), Article ID 269171, 3 pages
Clinical Study

Comparison of Tracheal Diameter Measured by Chest X-Ray and by Computed Tomography

1Department of Anesthesiology, Clinical Care Medicine, Kanagawa Dental College, Kanagawa 238-8580, Japan
2Department of Anesthesiology, School of Medicine, Keio University, Tokyo 160-8582, Japan
3Department of Anesthesia, Kasumigaura National Hospital, Ibaraki 300-8585, Japan

Received 3 May 2010; Accepted 20 July 2010

Academic Editor: Michael R. Frass

Copyright © 2010 Shigeki Sakuraba et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Assessments of tracheal diameter (TD) are important to select proper endotracheal tubes. Previous studies have used X-ray and physical indices to estimate tracheal diameter but these may not reflect the actual TD. We compared TD measured by X-ray (TD-XP) and by computer tomography (TD-CT) in 200 patients. Also, we analyzed correlation of TD-CT with physical indices such as age, height, weight, and BMI. TD-XP and TD-CT were significantly correlated (male: , ; female: , ). TD-XP was 0.4 mm wider in male and 1.0 mm wider in female than TD-CT. However, correlation coefficients of TD-XP and TD-CT are very weak (male: ; female: ). TD-CT did not correlate with age, height, weight, or BMI. Our findings suggest that correlations of TD-XP and TD are statistically significant but not clinically significant. Physical indices are not useful to estimate TD.