Key result
Dietary sodium restriction fails to reduce mortality or HF hospitalizations compared to liberal intake.
Why the study?
Clinical trials on dietary sodium restrictions among HF patients have provided inconsistent findings, with limited evidence on the major benefits and risks across different levels of sodium intake restriction.
Does strict or moderate dietary sodium restriction reduce all-cause mortality and heart failure hospitalization in patients with chronic heart failure compared to liberal sodium intake?
Meta-Analysis
Does strict or moderate dietary sodium restriction reduce all-cause mortality and heart failure hospitalization in patients with chronic heart failure compared to liberal sodium intake?
In patients with chronic heart failure, strict to moderate dietary sodium restriction does not significantly reduce mortality or hospitalization compared to liberal intake, though it may modestly improve quality of life, NYHA class, and natriuretic peptide levels.
Answers are grounded in this paper and cite their sources.
No clear mortality or hospitalization benefit from strict versus moderate/liberal sodium intake in HF; challenges guideline recommendations and leaves optimal targets open for further RCTs.
Background: Clinical trials on dietary sodium restrictions among heart failure (HF) patients have provided inconsistent findings with limited evidence of major benefits and risks of sodium intake restrictions. This systematic review and meta-analysis compared the impact of strict versus moderate versus liberal sodium intake on all-cause mortality, HF hospitalization and composite outcomes in HF patients. Methods: A systematic search for randomized controlled trials (RCTs) was conducted across Embase, MEDLINE, and Cochrane Library databases in May 2026 and updated in June 2026. Risk of bias assessment was conducted using the Cochrane Risk of Bias (RoB 2) tool and certainty of evidence assessed using the GRADE framework. Meta-analysis using random-effects model was conducted to pool effects across included studies. Results: A total of 10 RCTs met the inclusion criteria. Strict and moderate sodium restriction strategies did not significantly reduce all-cause mortality (OR = 0.53; 95% CI: 0.10–2.69; I2 = 18.3%), HF hospitalization (RR = 0.84; 95% CI: 0.62–1.15; I2 = 0%) or composite outcome of death/HF hospitalization (OR = 0.92; 95% CI: 0.67–1.26; I2 = 0%) compared to liberal sodium restriction. However, strict to moderate sodium intake was associated with improved quality of life (QoL) (SMD = 0.33; 95% CI: 0.15–0.51; I2 = 0%), New York Heart Association (NYHA) functional class improvement (OR = 1.51; 95% CI: 1.18–1.94; I2 = 0%) and reduced BNP/NT-proBNP (ratio = 0.62; 95% CI: 0.42–0.90; I2 = 57.2%) compared to liberal intakes. Conclusions: Compared with higher sodium intake, lower sodium targets did not demonstrate significant reductions in all-cause mortality or HF hospitalization in the available RCTs. Lower sodium intake was associated with improvements in quality of life, NYHA functional class, and BNP/NT-proBNP; however, the certainty and generalizability of these findings remain limited. Current evidence is therefore insufficient to establish an optimal dietary sodium target for patients with heart failure, and adequately powered randomized trials comparing clearly defined sodium targets are warranted.
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Safiya et al. (2026) conducted a meta-analysis in Chronic Heart Failure. Strict or moderate dietary sodium restriction vs. Liberal dietary sodium restriction was evaluated on All-cause mortality (OR 0.53, 95% CI 0.10-2.69). Strict and moderate sodium restriction did not significantly reduce all-cause mortality (OR 0.53; 95% CI 0.10-2.69) or HF hospitalization (RR 0.84; 95% CI 0.62-1.15) vs liberal intake.
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