Predictive impact of haemoglobin level in ruptured cerebral aneurysms

Abstract

Anaemia is a multicausal clinical condition affecting nearly one in two patients with aneurysmal subarachnoid haemorrhage (aSAH). Cerebral oxygen delivery depends on blood flow and Hb concentration. In acute brain injury, including aSAH, compensatory mechanisms are impaired, making anaemic patients more susceptible to cerebral hypoxia. Although the impact of elevated Hb levels in aSAH remains insufficiently studied, both low and high Hb levels are believed to influence cerebral perfusion, particularly under conditions of cerebral vasospasm.