目的探讨长期高浓度锰暴露职业人群血压及心电图的改变。进一步了解接触锰作业对职工健康损害的机制,为保护接触锰烟尘作业职工身体健康提供理论依据。方法某局桥梁厂男性电焊工65人作为锰接触组,另选择该厂不接触锰烟尘及其他有害物质的行政、后勤人员65名作为对照组。采用问卷现场调查及环境监测,测量血压及描记心电图的方法。结果 2组职工心率、心电图和血压与对照组比较,锰接触组心率明显加快,P-R间期明显缩短,QRS波明显变宽,工龄5~10 a组和10 a以上组T波增高;锰接触组舒张压均值降低,与对照组比较,差异有统计学意义(P<0.05)。结论长期较高浓度锰暴露对男工心功能有一定的影响。 Objective To investigate the changes of blood pressure and electrocardiogram in long-term high-concentration manganese exposure occupational population. Further understanding of the mechanism of injury to workers’ health caused by exposure to manganese provides a theoretical basis for protecting the health of workers exposed to manganese dust. Methods Sixty-six male welders at a bridge plant in a bureau were selected as the manganese contact group. Sixty-five administrative and logistic staff without exposure to manganese smoke and dust and other harmful substances were selected as the control group. Using questionnaire survey and environmental monitoring, measurement of blood pressure and electrocardiogram tracing method. Results Compared with the control group, heart rate, electrocardiogram and blood pressure were significantly increased in the two groups of workers, and the PR interval was significantly shortened and the QRS wave was significantly widened. The T waves in the 5 ~ 10 a and 10 - Group mean diastolic pressure decreased, compared with the control group, the difference was statistically significant (P <0.05). Conclusion Long-term higher concentrations of manganese exposure have a certain impact on male workers’ heart function.