To prove the involvement of the autonomic nervous system in the formation of thrombotic status of the patients. 24 patients with myocardial infarction were enrolled in the study. Catecholamines levels were compared duing pain episodes and at rest. Patients were divided in to 2 groups according to the level of norepinephrine during the pain episode: Group 1-12 persons with the level of norepinephrine more than 500 pg/ml, and group 2-12 persons with a level below 500 pg/ml. Patients in group 1 the level of beta thromboglobulin and thromboxane were elevated, as well as there are changes of cAMP and cGMP, indicating increased thrombogenic activity. Particular attention was paid to the 8 patients in Group 1, in which the level of norepinephrine is maintained above 500 pg/ml both during pain and at rest (disseminated intravascular coagulation).