Background. The article considers with the current problem of cryptogenic stroke and embolic stroke of undetermined source.The objective was to analyzed the results of follow-up of patients with embolic stroke of undetermined source in a specialized outpatient center.Methods and materials. The data of 169 patients who completed a two-year follow-up period with embolic stroke of undetermined source (ESUS) and cardioembolic stroke were analyzed.Results. We presented comparative results on the structure of incidence rate, age differences, comorbid pathology, as well as on the frequency of repeated cardiovascular events in groups with cardioembolic stroke and embolic stroke of undetermined source.Conclusions. Patients with ESUS are an extremely difficult category of patients for diagnostic search, for whom the actual task is to develop an examination algorithm for the earliest possible detection of the cause of stroke and to determine the optimal methods of secondary prevention.
