Huibers AE, et al. - The relevance of cerebral hyperperfusion syndrome (CHS) was ascertained in the procedural stroke rate following carotid artery stenting (CAS). Performing a systematic search on incidence rates of CHS after CAS yielded 33 studies concerning 8731 CAS patients. Findings revealed the pooled CHS risk of 4.6%. In patients undergoing carotid angioplasty with stenting, CHS is noted to be a serious and frequent complication. It is most likely to occur in the very early post-procedural period.