The congestive heart failure (CHF) has become one of the most common syndromes afflicting the population. The long-term prognosis of these patients is bad. The CHF shows a tendency toward fast progressive development. The aim of our study was a retrospective investigation on CHF patients, a determination of CHF functional class by NYHA and its type, a determination of the most important diseases leading to heart decompensation and of the reasons for dead in these patients. For a 6-year period we investigated 6428 patients. 1095 (17.03%) of them were with a different degree of CFH. More of them were with II and III functional class of CHF by NYHA. In the age decade from 61 to 70 years the frequency of CHF increased significantly. The most important diseases leading to CHF syndrome were chronic ischemic disease, arterial hypertension, COPD with chronic cor pulmonale and valve diseases. The average age of deceased CHF patients was 67.8 +/- 7.4 years. After the manifestation of the first group of symptoms the mean life duration of CHF patients was 13.2 +/- 4.1 years.