The survey consists of three visits to subjects' homes (day: 1; 10+/-4 days and 30+/-4 days) and one phone contact one year after first visit and would be performed by trained nurses. The monitoring system would be installed during the first visit for all patients who sign informed consent form and returned at the third visit one month later. The main questionnaire will be completed during the first visit, which included detailed questions about present health status and history of diseases, hospitalizations, and current medications. The socioeconomic part of the questionnaire included questions concerning the personal and family situation, economic status, household structure, leisure activities, hobbies, and social life. During this visit the Geriatric scale of depression evaluation will be given to the subject to be self-completed, and will be collected at the second visit. BP readings would be taken three times during each visit to the patient's home. Anthropometric measurements are taken twice: at visit one and visit three at the end of the ECG monitoring. Blood samples are taken from subjects at the second visit after 10 to 12-hour fasting. The follow-up data sheet would be completed at the initial visit and at the follow-up visit twelve months after inclusion to the survey. The fieldwork is subcontracted to a company specializing in market research projects for the private and public sectors. The transportation of biological material to the Central Laboratory has been subcontracted to a company with expertise in blood sample transport over long distances. Interviewers will be recruited from among professionally active nurses. Most of them will be social nurses working within local communities. All nurses participating in the survey will complete special training prepared for fieldwork executors of the NOMED-AF project.