Overview of Keshan disease surveillance and trend analysis in China.

Objective To analyze the situation of Keshan disease in China and provide a scientific basis for adjustment of the control strategies. Methods Relying on the Keshan disease surveillance in 2014 and the Twelfth Five-Year Plan Final Assessment Project in 2015 and 2016, in each surveillance site of the 12 provinces including Hebei, Shanxi, Inner Mongolia, Liaoning, Jilin, Heilongjiang, Shandong, Chongqing, Sichuan, Yunnan, Shaanxi, and Gansu, the residents were investigated by face-to-face questionnaire interviews, physical measurements and electrocardiography. Echocardiographic examination and chest X-ray examination were conducted for those patients with suspected Keshan disease. Results In 2014, the data of a total of 171 838 individuals were included in the analyses. A total of 749 cases of Keshan disease were detected in all the survey sites of 12 provinces. The detection rate was 43.6/10 000. Among them, 160 cases were chronic, the detection rate was 9.3/10 000; the potential type was 589 cases, the detection rate was 34.3/10 000. In 2015 and 2016, the data of a total of 396 977 individuals were included in the analyses. A total of 2 127 cases of Keshan disease were detected in 12 provinces. The detection rate was 53.6/10 000. Among them, 377 cases (9.5/10 000) were chronic, and the potential type was 1 750 cases (44.1/10 000). Conclusion There are still natural chronic Keshan disease cases in the endemic area, therefore the prevention and treatment tasks cannot be ignored. Key words: Keshan disease; Present condition; Surveillance; Elimination