The response of the cardiovascular system of 64 patients operated for rheumatic heart disease to mineral carbon dioxide baths was studied in the course of rehabilitation in low-mountain health resort. It was found that the above baths have a training effect on the cardiac muscle, improve myocardial metabolism. They are an essential factor in combined sanatorium treatment of patients after surgical correction of valvular defects. Baths-induced changes in the central and peripheral hemodynamics depend on cardiovascular function. Therefore, they require an individual approach. If the exposition increases to 15 minutes, mineral carbon dioxide baths have more potent training effect on the myocardium and raise effectiveness of the sanatorium treatment.