Long-Term Cognitive Decline After Subarachnoid Hemorrhage: Pathophysiology, Management, and Future Directions

Subarachnoid hemorrhage is a critical neurological condition accounting for about 5% of all strokes, and survivors experience long-term cognitive deterioration and increased risk of dementia. The major processes involved in such decline include early brain injury, delayed cerebral ischemia, neuroinflammation, superficial siderosis, and hydrocephalus. These have emerging treatments that offer promise for the mitigation of effects such as inflammation, iron chelation, and microvascular dysfunction. Genetic predispositions have been associated with post-subarachnoid hemorrhage cognitive outcomes and emphasize a role for personalized care strategies. Management techniques reviewed include long-term cognitive health, such as endovascular coiling and surgical clipping. Other rehabilitation strategies that enhance cognitive reserve and pharmacological interventions are discussed about improving the quality of life in survivors. The review highlights the need for further research into targeted therapies, genetic markers, and innovative approaches to prevent cognitive decline, ultimately aiming to optimize long-term outcomes for individuals affected by subarachnoid hemorrhage.