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本文对进驻海拔５０００ｍ以上地区一年的５８名青年在现场拍摄正、侧位Ｘ线胸片并与在平原时相比较。结果：心脏长径及心胸比率显著缩小（Ｐ＜０．００１）；心脏面积缩小，但相差不显著（Ｐ＞０．０５）；心脏宽径、心脏深径、心脏体积及心脏体积指数显著增加（Ｐ＜０．００１或Ｐ＜０．０１）；右心房宽径、右心房高径、左室壁厚度、肺面积、升主动脉横径、主动脉结横径、肺动脉干横径、肺动脉段突度、右肺下动脉横径及右肺下动脉与气管横径比值均显著增加（Ｐ＜０．００１）。
In this paper, 58 youngsters stationed in an area above 5000m above sea level for one year were photographed at the scene with lateral X-ray and compared with those in the plain. Results: The ratio of long diameter and cardiothoracic diameter was significantly reduced (P <0.001); the heart area was reduced but the difference was not significant (P> 0.05); The width of heart, deep heart, heart volume and cardiac volume index were significantly increased (P <0.001 or P <0.01); right atrium width, right atrium height, left ventricular wall thickness, lung area, ascending aortic diameter, aortic node diameter, pulmonary artery diameter, pulmonary artery Sectional protrusion, the diameter of the right inferior pulmonary artery and the ratio of the right inferior pulmonary artery to the tracheal diameter were significantly increased (P <0.001).