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Reduced Salt Intake for Heart Failure: A Systematic Review
Kamal R Mahtani1, Carl Heneghan1, Igho Onakpoya1
1Centre for Evidence Based Medicine, Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, United Kingdom.
JAMA Internal Medicine
|November 7, 2018
Summary
Reducing dietary salt intake shows limited benefits for heart failure patients. Current evidence is inconclusive, highlighting the need for more robust studies to confirm effectiveness in both inpatients and outpatients.
Area of Science:
- Cardiology
- Clinical Nutrition
- Evidence-Based Medicine
Background:
- Heart failure affects over 26 million worldwide, causing significant mortality and healthcare utilization.
- Current management often includes dietary salt restriction, but its benefits remain uncertain.
Purpose of the Study:
- To systematically review randomized clinical trials on reduced dietary salt intake in adult heart failure patients.
- To evaluate the impact of salt restriction on mortality, adverse events, and functional status.
Main Methods:
- Systematic search of multiple bibliographic databases (Cochrane, MEDLINE, Embase, CINAHL).
- Evaluation of study quality and extraction of data on primary (mortality, adverse events) and secondary (hospitalization, NYHA class, blood pressure) outcomes.
- Inclusion of 9 studies with 479 participants.
Main Results:
- None of the included studies provided sufficient data on primary outcomes.
- Evidence for clinical improvement in outpatients reducing salt intake was limited.
- Results were inconclusive for inpatients, with conflicting findings on New York Heart Association (NYHA) functional class improvement.
Conclusions:
- A paucity of robust, high-quality evidence exists to support or refute current dietary salt restriction guidance for heart failure.
- Well-designed, adequately powered studies are necessary to clarify the benefits of salt restriction in heart failure management.
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