Time is brain: timing of revascularization of brain arteries in stroke.

Ischaemic stroke is the second leading cause of mortality and disability in the western world. Revascularization interventions are the cornerstone of the acute treatment of this pathology and must be administered as soon as possible after the patient's arrival. They consist of intravenous thrombolysis (IVT) with alteplase, recommended by the guidelines within 4.5 h of the onset of symptoms, and endovascular treatment, recommended within 6 h of the onset of symptoms. The individualized patient selection based on the extent of the mismatch between the penumbra and the ischaemic core allowed to overcome the limits imposed by the rigid time windows, defining a benefit of mechanical revascularization therapies up to 24 h from the theoretical onset of symptoms (last time the patient was known to be well) and up to 9 h for IVT since the theoretical onset of symptoms (last time the patient was known to be well). Advanced neuroimaging methods with perfusion studies are a fundamental tool in patient selection. Their spread in the territory, together with a greater availability of neurovascular treatment units are desirable to ensure a fair delivery of treatment to all patients with ischaemic stroke.