FIELD : medicine.SUBSTANCE : invention relates to medicine, namely to forecasting in cardiovascular pathology. Patient at the stage of primary medical and social care after discharge from the hospital, the doctor calculates the risk of adverse clinical outcome (RACO) using the original formula. And if the value of RACO is negative, the probability of an adverse clinical outcome is low. If the value of RACO is positive or equal to zero, the probability of developing an adverse clinical outcome is high.EFFECT : method allows accurate and timely prediction of the risk of adverse clinical outcome in patients with atrial fibrillation after a cardioembolic stroke, and performing the necessary prophylaxis.1 cl, 1 tbl, 2 ex