Change and Relationship of Hematocrit and Electrocardiogram of the Crew in High Altitude Span Transportation

Objective: To investigate the effect of high altitude span transportation on the change of hematocrit and electrocardiogram of the crew in the plateau construction, and discuss their relationship. Method: By SPSS 11.0 statistical software, to treat hematocrit and electrocardiogram in the examination data of the the crew, who took part in the construction of Qinghai-Tibetan railway in 2003, before, during and after the construction. Then, we compared the data among the constructors in the fixed altitude during the same period. Result: The hematocrit of the crew slowly and continually rose to the maximum(p<0.01) after the construction in the high altitude span during one construction year, and the abnormal rate of electrocardiogram obviously decreased(p<0.05). The abnormal rate of electrocardiogram apparently improved when hematocrit reached 52% among the range from 45.12% to 52.24%, and the correlation analysis showed that the electrocardiographic change was closely and negatively correlated with the hematocrit among the range of hematocrit(p<0.05). Conclusion: Although the higher-level stress state of the crew made the hematocrit in the blood continually increase in the long-term high altitude span construction, the hematocrit reached the more reasonable hematocrit compensation and made it the optimum state of Hct in the end. As a result, the perfusion of tissues and organs was improved. The abnormal rate of electrocardiogram apparently improved because the oxygen delivery of the myocardium reached the optimum compensation.

Objective： To investigate the effect of high altitude span transportation on the change of hematocrit and electrocardiogram of the crew in the plateau construction, and discuss their relationship. Method： By SPSS 11.0 statistical software, to treat hematocrit and electrocardiogram in the examination data of the the crew, who took part in the construction of Qinghai-Tibetan railway in 2003, before, during and after the construction. Then, we compared the data among the constructors in the fixed altitude during the same period. Result： The hematocrit of the crew slowly and continually rose to the maximum （p 〈 0.01 ） after the construction in the high altitude span during one construction year, and the abnormal rate of electrocardiogram obviously decreased（p 〈 0.05）. The abnormal rate of electrocardiogram apparently improved when hernatorit reached 52% among the range from 45.12% to 52.24%, and the correlation analysis showed that the electrocardiographic change was closely and negatively correlated with the hematocrit among the range of hematocrit（p 〈 0.05）. Conclusion： Although the higher-level stress state of the crew made the hematocrit in the blood continually increase in the long-teml high altitude span construction, the hematocrit reached the more reasonable hematocrit compensation and made it the optimum state of Hct in the end. As a result, the perfusion of tissues and organs was improved. The abnormal rate of electrocardiogram apparently improved because the oxygen delivery of the myocardium reached the optimum compensation.