What This Means
This study looked at people who had a blockage in the basilar artery, a major blood vessel supplying the back of the brain, but whose stroke symptoms were relatively mild. It is unclear whether removing the clot with a catheter procedure (thrombectomy) on top of standard medical care helps in these patients. Researchers followed 401 patients at eight stroke centers in a prospective registry and compared those who were intended to receive thrombectomy plus medical care with those who received medical care alone, using statistical weighting to make the groups more comparable.
Overall, thrombectomy was associated with a better chance of being independent at 90 days, a better chance of an excellent recovery, and lower chances of death and of early worsening in the first 72 hours. However, the independence benefit was clear only in patients with moderately mild symptoms (stroke scale scores of 6-9), not in those with the mildest symptoms (0-5). In the mildest group, thrombectomy was still linked to less early worsening and lower death rates. When the analysis accounted for patients in the medical-only group who later received thrombectomy after worsening, the functional advantage was smaller.
This research suggests that thrombectomy may be worth considering in basilar artery occlusion even with mild symptoms, especially at the higher end of that range. Because this was a registry rather than a randomized trial, the findings show associations, not proof of cause, and the results may be affected by factors that could not be fully adjusted for.