cognition after carotid endarterectomy or stenting

A neurology 77 published a interesting report regarding the topic above.
divided in 2 arms -one for CEA ( carotid endarterectomy) , another CAS (carotid artery stenting)
the NIHSS (NIH stroke scale) assessed at baseline and 1 daY postprocedure. Modifie RANKIN SCALE at baseline, 1 and 6 month. Cognition assessed in the week before procedure and 6 months later.Pt also assessed for mood using Beck depression inventory II.
MRI with DWI performed 1 to 3 days before and 3 days thereafter to assessnew ischemic lesion.]

Result:significant decrease in cogntion sumscore after CAS from baseline to 6 month
NO significant decrease score after CEA.
The mean difference between changes was not statistically significant.
the worst cogntion functioning inpt treated with CAS consistent with higher rate NEW ischemic DWI lesion after CAS