Short and long-term prognostic value of hyponatremia in heart failure with preserved ejection fraction versus reduced ejection fraction: An analysis of the Korean Acute Heart Failure registry

Hyponatremia is independent of HF type. Hyponatremia is a significant risk factor for adverse in-hospital outcomes; however its long-term prognostic value is only limited to patients with HFrEF, but not for those with HFpEF.