Cerebral Protection in Transcatheter Left Atrial Appendage Occlusion

Inclusion Criteria: 1. 18 Years and older 2. Subject able to provide signed informed consent. 3. Documented permanent, persistent, or paroxysmal atrial fibrillation 4. CHA2DS2VASc risk of stroke ≥2 5. At least one of the following criteria: 1. Contraindications to the use of anticoagulants, 2. HSBLED bleeding risk ≥3 Exclusion Criteria: 1. Serious mental diseases, particularly: dementia syndrome of any etiology, schizophrenia,schizoaffective disorders, bipolar disorder 2. History of ischemic stroke 3. Chronic abuse of alcohol or any other psychoactive substances except for nicotine 4. long-term therapy with benzodiazepines 5. The use of antidepressants in 3 months prior inclusion. 6. Previous infections of the central nervous system, including neuroborreliosis 7. Parkinson's disease 8. Huntington's chorea 9. Creutzfeld-Jakob disease 10. Pick's disease 11. Significant atherosclerosis of the cephalic arteries (\> 70% LCCA or the brachiocephalic trunk) 12. Strictures, ectasias, dissection or aneurysms at the exit of the LCCA or the brachiocephalic trunk from the aorta and up to 3 cm above 13. Advancement of vascular changes in DW MRI of the head, grade 3 on the Fazekas scale 14. Presence of a thrombus or tumours of a different nature in the left atrium or its ear 15. Presence of a thrombus in the left ventricle 16. Left atrial appendage anatomy preventing the use of occluders to close the left atrium appendage 17. The presence of mechanical heart valve prostheses 18. The state after the operative closure of the defect in the atrial septum 19. Condition after closing the defect in the interatrial septum with the use of occluders 20. Active infective endocarditis 21. Presence of devices and prostheses that prevent the performance of MRI (pacemakers, clips in the CNS) 22. Status after oesophagal surgery 23. Esophageal diverticula 24. Esophageal varices\> grade 3 25. Allergic to contrast agents 26. A contraindication to use antiplatelet drugs 27. Diagnosis of neoplastic disease with estimated survival beyond 1 year 28. Clininally evident hypothyroidism and hyperthyroidism 29. Klaustrofobia 30. Pregnancy 31. AIDS 32. Participation in other drug research studies 33. The presence of circumstances or any medical condition the Investigator considers problematic for subject inclusion, or test results that may couse problems to provide reliable, acurate to interpretation results