Hyponatremia in chronic heart failure

: Hyponatremia - lowering of sodium in blood serum below 135 mmol/l - is a frequent disorder of electrolyte metabolism in patients with chronic heart failure (CHF). Hyponatremia is a risk factor of elevated mortality, repetitive hospitalizations, and worsening of kidney function in patients with decompensation of CHF. In this review we present pathophysiology of hyponatremia and propose therapeutic approach to correction of this disorder.