Electrocardiogram observation in the populations lived in coal-burning-borne endemic fluorosis areas after comprehensive treatment

Abstract

Objective To examine the electrocardiogram(ECG) changes in the populations lived in coalburning-borne endemic fluorosis areas after comprehensive treatment and to select indexes for evaluating health improvement.Methods People lived in coal-burning-borne endemic fluorosis areas in Bijie City were selected and divided into four groups according the length of time of comprehensive treatment and the severity of fluorosis in 2011:light ill area with shorter treatment time(Chadi Village 52 people),light ill area with longer treatment time (Xiaba Village 58 people),seriously ill area with shorter treatment time(Maoliping Village 52 people) and seriously ill area with longer treatment time(Zhongtun Village 60 people).In addition,57 people in Shawenxin Village Guiyang City were selected as non-fluorosis controls.Synchronous-lead ECG machine was used to observe ECG of the populations.Results As compared to the non-fluorosis control group [47.4％ (27/57)],there were significant differences in the abnormal rate of ECG in seriously ill area with shorter treatment time and seriously ill area with longer treatment time groups[71.2％(37/52),66.7％(40/60),x2 =6.346,4.448,all P ＜ 0.05] ; but no significant changes of the abnormal rate of ECG were found in light ill area with shorter treatment time and light ill area with longer treatment time groups[61.5％(32/52),56.9％(33/58),x2 =2.199,1.046,all P ＞ 0.05].Among the same diseased areas with different length of treatment time,no significant difference of the abnormal rate of ECG was observed(x2 =0.244,0.261 in light and seriously ill areas,respectively,all P ＞ 0.05).Conclusions Significantly increased abnormal rate of ECG is observed in seriously ill areas.However,after a certain period of time of comprehensive prevention treatment,ECG abnormal rate is not changed significantly. Key words: Fluorine ; Electrocardiography ; Data collection