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对在不同海拔高度(4500～4600米,2800米、80米)从事不同强度劳动的五组正常男性青年作了超声心动图检查。结果表明,右心负荷随劳动强度和海拔高度的增加而加重,表现在高原右室横径,右室流出道与右肺动脉内径增宽,右室等容舒张期明显延长,肺动脉高压发生率明显增加,重劳动组尤为突出。左心对高原环境的适应则较好。在海拔4500～4600米高原左室横径及舒张末期容积虽然明显缩小,但每搏与每分心输出量,心排血指数与排血分数等与平原对照值却没有显著差异。
Echocardiography was performed on five groups of normal male youth at different altitudes (4500 to 4600 meters, 2800 meters, 80 meters) in different intensities of work. The results showed that the right heart load increased with the increase of labor intensity and altitude, manifested in the right ventricular transverse diameter of the plateau, right ventricular outflow tract and right pulmonary artery diameter widened, right ventricular isovolumic diastole was significantly prolonged, the incidence of pulmonary hypertension was significantly Increased, heavy labor group is particularly prominent. The left heart on the plateau environment is better. Although the left ventricular diastolic diameter and the end-diastolic volume of 4500 ~ 4600 m altitude were significantly reduced, there was no significant difference between the stroke control and each cardiac output, cardiac output index and blood perfusion score.