Hyponatremia is a common phenomenon seen in patients after aneurysmal SAH. Although there is no definitive cause to date, it is frequently thought to be the result of SIADH, CSW, or a combination ...

According to Palmer (2000), SIADH is an expansion of extracellular ... CSW has been proposed as a more immediate cause of hyponatremia in SAH patients.

The cause of hyponatremia was congestive heart failure (CHF) in 29.7% of patients, cirrhosis in 18.0% of patients, and the syndrome of inappropriate antidiuretic hormone hypersecretion (SIADH ...