An analysis of survey results of dilated cardiomyopathy in non-Keshan disease areas in Shandong Province

Abstract

Objective To observe the dilated cardiomyopathy （ DCM ） in non-Keshan disease areas in Shandong Province and assess scientifically the effectiveness of prevention and control measures on Keshan disease （KSD）. Methods According to the scheme of DCM condition survey of our country in non-Keshan disease areas, seven representative counties（cities, areas） were chosen by their similarities in natural environment, production and life style to KSD areas; one or two townships （ towns ） were chosen in each county （ city , area ）; one village was selected as a survey point in each township （ town ） . In each survey point , about four hundred and twenty natural populations were checked by asking detailed history, physical examination, and electrocardiography （ECG） tracings, and suspicious people were taken chest X-ray examination and cardiac ultrasound（UCG）. The samples of inside and outside environmental were collected in partial residents and the selenium contents were detected by 2,3-diaminonaphthalene fluorometric method. At the same time the income, food of inhabitant and other basic information were collected. Results ① In 13 survey villages, sixty-four hundred and sixty-three residents were surveyed and 2 DCM cases and 111 similar potential KSD cases were detected, the detection rate was 1.75%（113/6 463）. ② Sixty-four hundred and sixty-three residents were traced by ECG and the incidence of abnormal ECG was 20.4%（1 318/6 463）, and sinus bradycardia, T-wave changes, sinus tachycardia, ST-T changes, occasional ventricular beating earlier, complete right bundle branch block, left anterior branch block, room premature beat, left ventricular high voltage, auriculo-ventricular block, et al were common. ③Samples of hair（260）, wheat（260）, corn （240） and soil （104） were collected, and the selenium contents were （0.353 ± 0.082）, （0.035 ± 0.009）, （0.024 ± 0.008） and （0.164 ± 0.019）mg/kg, respectively. Annual per capita income of each survey point was 2 500-8 670 yuan, and the residents’ main staple food was flour. Conclusion The results of DCM condition in non-Keshan disease areas of Shandong Province are stable and have provided a scientific basis for drawing up the national standard of eliminating KSD. Key words: Dilated cardiomyopathy; Keshan disease; Electrocardiogram; X-ray; Ultrasound; Selenium