Spontaneous prospective observational multicentre pharmacological study that aims to evaluate whether, from a statistical point of view, there is a significant difference between the use of Ticagrelor in non-responders patients to Clopidogrel undergoing carotid stenting and Clopidogrel in responders undergoing carotid stenting, in the onset of death and major adverse cardiovascular events (MACE) and bleeding events, 1 and 3 months after the procedure. Furthermore, the study aims to evaluate the possible preoperative clinical and pharmacological factors most associated with the phenomenon of resistance to Clopidogrel. Inclusion criteria: The data will be collected on adult patients (age\> 18 years) who have given their consent to participate in the study, belonging to the U.O. of Vascular Surgery of the IRCCS Policlinico San Donato and the U.O. of Vascular Surgery of the participating centers and there subjected to the treatment of carotid stenosis by stenting technique. Exclusion criteria: Those patients who are minors, who have not given their consent to participate in the study, or who have carotid stenosis not susceptible to intervention by stenting will be excluded from the study. Pregnant or lactating women will also be excluded from the study (such as situations in which carotid stenting is contraindicated regardless of the execution of the study).