Postinfectious inflammation in cerebrospinal fluid is associated with nonconvulsive seizures in subarachnoid hemorrhage patients

•The association of NCS with SAH and the contributing factors to NCS after SAH remains elusive.•SAH patients with older age, intracranial infections and higher mFS are more likely to develop NCS.•A high level of CSF interleukin-6 is an independent risk factor for NCS.•For brain protection of severe brain injury after SAH, we should focus on the increasingly important role of inflammatory response.