目的:研究成人气管狭窄横断面积变小多少,可以导致呼吸困难。方法:用螺旋CT对11例气管狭窄的患者进行横断扫描,扫描后在CT上测量与计算正常气管的横断面积和最狭窄部位的气管面积。结果:当气管狭窄后,气管平均通气面积小于正常气管本身通气面积的1/3时,便可以引起呼吸困难。结论:用CT对气管横断面积的测量,可以确定单纯的由气管狭窄引起的呼吸困难。 Objectives: To study how much the tracheal stenosis in adults decreases in size and cause dyspnea. Methods: Eleven patients with tracheal stenosis were scanned by spiral CT. After tracing, the tracheal area and tracheal area were measured and calculated on CT. Results: When the tracheal stenosis, the average tracheal ventilation area is less than the normal tracheal ventilation area of ​​their own 1/3, it can cause breathing difficulties. CONCLUSIONS: The measurement of tracheal cross-sectional area using CT can determine simple dyspnea caused by tracheal stenosis.