Abstract
Hyponatremia is a known complication in patients with heart failure (HF). HF patients with severe congestion, hyponatremia, and renal insufficiency are difficult to manage and may have worse outcomes. A main cause of hyponatremia is inappropriately elevated level of plasma arginine vasopressin (AVP), which causes water retention at the collecting duct. AVP antagonists have thus been developed to increase aquaresis and serum sodium levels in patients with euvolemic and hypervolemic hyponatremia. Although tolvaptan, an AVP-2 receptor antagonist, did not show outcomes benefit in patients with decompensated HF, prospective studies are ongoing to evaluate its optimal role in targeted HF patients.
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