CT Measurement of Diameter and Dimension of the Trachea in Normal Korean Adults

Han, Jae Youl; Kim, Kwang Ho; Lee, Gun; Kim, Hyung Jin; Cho, Soon Koo; Sun, Kyung

Abstract

BACKGROUND: Knowledge of size and morphology of the normal trachea is important for airway management and tracheal reconstruction. Conventional radiography is a simple method used to measure the tracheal diameter, but it is not accurate because of the artifacts related to image magnification and overlapping by the shoulder. The purpose of this study was to provide the normal values of the tracheal size and anatomy in Korean adults using Computerized Tomography. MATERIAL AND METHOD: There were 43 men and 34 women included in this study. They were divided into three age groups(group 1, 20-39 years ; group 2, 40-59 yeas ; groups 3,>or=60 years). The anteroposterior and transverse diameters and cross - sectional areas of the trachea were measured at the level of the thoracic inlet(Level 1) and the aortic arch(Level 2). These values obtained at each level were compared between age groups and sexes. RESULT: In 43 men, the anteroposterior / transverse diameters(mean SD in millimeters) of the trachea at levels 1 and 2 were 19.95+/-2.99 / 17.72+/-2.13 and 19.77+/-2.57 / 18.02+/-2.19, respectively. In 34 women, those values at levels 1 and 2 were 15.56+/-2.12 / 14.18+/-2.07 and 15.35+/-1.82 / 15.00+/-1.60, respectively. At both levels, the anteroposterior and transverse diameters were significantly greater in men than in women (p<0.05). The cross-sectional area of the trachea at levels 1 and 2 were 279.14+/-61.37 / 281.93+/-63.97 mm2 in men and 173.29+/-35.81 / 181.88+/-34.74 in women, respectively. They also showed significantly greater values in men than in women(P<0.05). There was no significant difference in diameters and cross-sectional areas of the trachea between age groups.
CONCLUSION
There are significant differences in the internal diameter and cross- sectional area of the trachea between men and women in normal Korean adults, while the age difference was insignificant. We believed CT is a relatively accurate and safe way to measure the internal diameter and cross-sectional areas of the trachea.