Is cerebral salt wasting after subarachnoid haemorrhage caused by bleeding

Background Cerebral salt wasting (CSW) frequently occurs concomitantly with aneurysmal subarachnoid haemorrhage (SAH). CSW induces excessive natriuresis and osmotic diuresis, and reduces total blood volume. As a result, the risk of symptomatic cerebral vasospasm is elevated. Therefore, we investigated the relationship between the amount of bleeding, the intensity of CSW, and the diameter of the middle cerebral artery (MCA).