Based on 78 patients with target mismatch volume on MRI prior to endovascular therapy, they found: time doesn’t matter, only reperfusion. The reperfusion outcomes for intervention under six hours are, grossly, no different than the outcomes for those greater than six hours. And, this makes sense – salvageable tissue is salvageable:
Frankly, this is probably the paradigm for which we should ultimately be moving for all stroke treatment. Time should not be a limiting factor – and, vice versa, should not be the sole indicating factor. Dead brain simply can’t benefit from revascularization – no matter how quickly it is provided, regardless of time window. The traditional “non-contrast head CT” is no longer adequate to provide optimal stroke care – CT angiography with perfusion calculations, or a rapid MRI protocol, should probably form the basis of modern stroke care moving forward.
“Response to endovascular reperfusion is not time-dependent in patients with salvageable tissue”
http://www.ncbi.nlm.nih.gov/pubmed/26224727