On the basis of practical experience of the clinic for Cardiovascular Surgery and up-to-date literature data the causes of early bleedings after open-heart surgery are summarized. The main clinical, roentgenological and laboratory features of the bleeding and the methods for the assessment of their origin are demonstrated. The authors consider pathophysiologic causes of hemocoagulation disturbances after surgery with artificial circulation. Characteristics of clinical and laboratory tests for coagulation and hemostasis disturbances and the algorhythms for their interpretation are described. Both nonspecific and pathogenetic methods for management of coagulopathy bleedings in early postoperative period have been described and discussed.