Kawakami Y, Nishimura M, Kusaka H
First Department of Medicine, School of Medicine, Hokkaido University, Sapporo, Japan.
Nihon Kyobu Shikkan Gakkai Zasshi. 1990 Jan;28(1):41-4.
Tracheal dimensions were analyzed radiographically in 17 pairs of healthy high school boys (12 pairs of monozygotic twins and 5 pairs of dizygotic twins). Coefficients of variation in interindividual extra- and intrathoracic tracheal widths, tracheal depth, tracheal length, and cross sectional area ranged from 9.6 to 17.3%. Genetic influence was found in intrathoracic as well as extrathoracic tracheal widths at maximal expiration and in extrathoracic tracheal width at maximal inspiration. Intrathoracic tracheal width remained the same at either maximal inspiration or expiration. However, extrathoracic tracheal width became larger at maximal inspiration regardless of great changes in pleural pressure. These results indicate that tracheal rings may be influenced by genetic factors and that extrathoracic width may be enlarged during maximal inspiration.
对17对健康高中男生（12对同卵双胞胎和5对异卵双胞胎）的气管尺寸进行了影像学分析。个体间胸外和胸内气管宽度、气管深度、气管长度及横截面积的变异系数在9.6%至17.3%之间。在最大呼气时胸内和胸外气管宽度以及最大吸气时胸外气管宽度方面发现了遗传影响。胸内气管宽度在最大吸气或呼气时保持不变。然而，无论胸膜压力有多大变化，胸外气管宽度在最大吸气时都会变大。这些结果表明气管环可能受遗传因素影响，且胸外宽度在最大吸气时可能会增大。
