Definition Hyponatremia ([Na+] < 130 mEq/L) is the most common electrolyte abnormality in hospitalized patients and is a relatively common complication after subarchnoid hemorrhage (SAH) with an incidence of 10% to 34%.  Occurring, in general, several days after the event, the hyponatremia is caused by either SIADH or cerebral “salt wasting”.  Patients who are euvolemic […]