Abstract
Hyponatremia is defined when the serum sodium concentration [Na+] is less than 135 mmol/L and it is the most common electrolyte disturbance found in clinical practice. Hyponatremia affects especially elderly individuals and approximately 50% of chronic hyponatremia are caused by inappropriate syndrome of antidiuretic hormone (AVP) secretion (SIADH). In recent years, several studies have a…