An investigation of current prevalence situation of dilated cardiomyopathy in non-keshan disease areas of Yunnan Province in 2011

Abstract

Objective In order to master the current prevalence situation of dilated cardiomyopathy in Yunnan Province.Methods An investigation of dilated cardiomyopathy was carried out in 17 counties from August to December in 2011 in non-Keshan disease areas.Two townships (towns) that similar to Keshan disease areas in natural environment,pattern of production and lifestyle in non-Keshan disease areas were selected in each project county,and 1 village was selected as surveillance site in each selected township(town).The number of resident in each village no less than 500 people was appropriate and deficiency was supplemented from neighboring villages.The sampling rate was no less than 80％.Clinical examination and electrocardiographic tracings were carried out.The patients with suspected dilated cardiomyopathy and latent Keshan disease were taken anteroposterior chest X-ray in accordance with the Non-Keshan Disease Area Dilated Cardiomyopathy Condition Survey Program.The surveillance was carried out based on National Investigation Scheme of Dilated Cardiomyopathy in Non-Keshan Disease Areas.Cases were diagnosed based on the diagnostic standard of dilated cardiomyopathy and suspected latent Keshan disease.Results In the 34 villages of 17 selected counties,14 545 people were investigated.Twenty-six cases of latent dilated cardiomyopathy and suspected latent Keshan disease were detected,and the total detection rate was 17.88/million.One case was dilated cardiomyopathy,and 25 cases were suspected latent Keshan disease,detection rates were 0.69/million and 17.19/million,respectively.Male and female cases were 15 and 11,respectively.The ratio of people aged 65 and older accounted for 42.31％(11/26),among them suspected latent Keshan disease accounted for 44.00％(11/25),and 1 case of dilated cardiomyopathy was in the 45 to 54 years old group.Electrocardiographic examination of 14 519 people,the abnormal rate was 8.13％(1 180/14 519).Among 112 chest X-ray films,104 cases had a cardiothoracic ratio less than or equal to 0.50,4 cases from 0.51 to 0.55,3 cases from 0.56 to 0.60,and 1 case more than or equal to 0.61.Conclusion The detection rate of dilated cardiomyopathy cases is lower in non-Keshan disease area of Yunnan Province,but suspected latent Keshan disease is detected. Key words: Dilated cardiomyopathy; Keshan disease; Investigation of situation