This is a protocol for a Cochrane Review (intervention). The objectives are as follows:

To assess the effect of thrombolysis in improving functional outcome and case fatality following aneurysmal subarachnoid haemorrhage. To determine the effect of thrombolysis on the risk of cerebral artery vasospasm, delayed cerebral ischaemia, and hydrocephalus following subarachnoid haemorrhage. To determine the risk of complications of local thrombolysis in aneurysmal subarachnoid haemorrhage.