Date	Event	Description
1 December 2004	New search has been performed	For the 2004 update of this review; one trial cited in the previous version as ongoing has been included (CAVATAS 2001). There are currently no other completed or ongoing randomised trials of vertebral artery stenting. Sixteen patients with vertebral artery stenosis were included in this arm of CAVATAS. The methodological quality, results and discussion sections have been substantially revised to incorporate the data from the included trial. Minor changes have been made to the objectives of the review to reflect improving knowledge since the last version. The conclusion of the review is that there is currently insufficient evidence to support the routine use of endovascular treatment of vertebral artery stenosis and it should only be performed within the context of randomised controlled trials.