Emergence of Chloride as an Overlooked Cardiorenal Connector in Heart Failure

Area of Science:

• Cardiology
• Nephrology
• Clinical Biochemistry

Background:

• Traditional heart failure (HF) management focused on sodium restriction.
• Recent studies challenge the consistent benefits of severe salt restriction in HF.
• Paradoxical adverse outcomes are observed with very low salt intake in advanced HF.

Purpose of the Study:

• To review the emerging role of serum chloride in cardiorenal syndrome.
• To explore chloride's prognostic value compared to sodium in HF.
• To discuss potential mechanisms and therapeutic implications of chloride levels in HF.

Main Methods:

• Review of contemporary studies and emerging data on serum chloride in HF.
• Analysis of mechanistic links between hypochloremia and HF pathophysiology.
• Exploration of clinical relevance and interpretation of chloride's prognostic role.

Main Results:

• Serum chloride levels show significant independent prognostic value in various HF syndromes.
• Hypochloremia is linked to adverse outcomes, potentially via renal tubular dysfunction and neurohormonal activation.
• Chloride's prognostic impact may exceed that of sodium in certain HF populations.

Conclusions:

• Serum chloride is a critical cardiorenal connector, challenging the sodium-centric view in HF.
• Hypochloremia represents a potential therapeutic target for improving HF outcomes.
• Future strategies for HF management should consider chloride levels for improved prediction and treatment.