The study showed that among patients admitted with suspected acute coronary syndrome, whose symptoms resolved following 24 hours, the diagnosis of myocardial infarction can be eliminated if the TnT remains ≤ 0.10 ng / l for 12-24 hours and CK-MB ≤5.0 ng / l up to 10-12 hours of onset of symptoms. If the TnT and CK-MB remains in the normal range for 12 hours after admission, the diagnosis of myocardial infarction can be eliminated if the 99% and 96% of patients. Moreover, for patients whose diagnosis of myocardial infarction was excluded, the persistent risk that over a period of one year to manifest coronary disease was correlated with positive history of the disease.