European Stroke Organisation (ESO), European Association of Neurosurgical Societies (EANS) and European Society for Minimally Invasive Neurological Therapy (ESMINT) guideline on aneurysmal subarachnoid haemorrhage.

The 2013 guideline suggested treating the ruptured aneurysm “as early as logistically and technically possible to reduce the risk of rebleeding; if possible, it should be aimed to intervene at least within 72 h after onset of first symptoms.” This was based on a small randomised trial, 34 which showed a trend towards better outcomes in patients operated within 3 days after the bleeding.

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