FIELD: medicine. SUBSTANCE: method involves performing endocardial auricle stimulation increasing heart rate beat and taking blood samples from coronary sinus before functional test and at the level of induced ischemia with atrium sodium-uretic blood peptide (ASP) determining in blood discharged from the heart followed. ASP increment is calculated based on difference between ASP content in coronary sinus blood in discharge state and ischemia state. Percentage is also calculated for the value of increment in comparison with initial state ASP concentration from formula: %ASP=(ASPischemia-ASPdischarge)/ASPdischarge*100%. The %ASP value being less than 30%, early stage preclinical heart insufficiency is diagnosed in ischemia disease patients. EFFECT: enhanced accuracy of diagnosis.
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