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Three gram sodium intake is associated with longer event-free survival only in patients with advanced heart failure

Terry A Lennie1, Eun Kyeung Song, Jia-Rong Wu

  • 1University of Kentucky, College of Nursing, 751 Rose Street, Lexington, KY 40536, USA. tlennie@uky.edu

Journal of Cardiac Failure
|March 29, 2011
PubMed

Insights

Sodium restriction to 3g may benefit heart failure (HF) patients in NYHA Class III/IV, but not Class I/II. This study investigated cardiac event-free survival based on sodium intake levels in HF patients.

Area of Science:

  • Cardiology
  • Clinical Nutrition
  • Public Health

Background:

  • Limited evidence supports sodium restriction recommendations for heart failure (HF) patients.
  • Investigating the impact of sodium intake on cardiac event-free survival is crucial for optimizing HF management.

Purpose of the Study:

  • To compare cardiac event-free survival in HF patients with sodium intake above and below 3 grams.
  • To determine if a 3-gram sodium intake threshold is associated with differential outcomes in HF patients.

Main Methods:

  • 302 HF patients (67% male, 62 ± 12 years, 54% NYHA Class III/IV) provided 24-hour urine sodium samples.
  • Patients were stratified into two groups based on a 3-gram urine sodium cutpoint and NYHA Class (I/II vs. III/IV).
  • 12-month cardiac event-free survival was assessed using interviews and medical records, analyzed with Kaplan-Meier curves and Cox regression.

Main Results:

  • For NYHA Class I/II patients, a 24-hour urine sodium ≥ 3g was associated with a hazard ratio of 0.44 (95% CI = 0.20-0.97).
  • For NYHA Class III/IV patients, a 24-hour urine sodium ≥ 3g was associated with a hazard ratio of 2.54 (95% CI = 1.10-5.84), after controlling for covariates.
  • These findings were adjusted for age, gender, HF etiology, BMI, ejection fraction, and comorbidity score.

Conclusions:

  • Dietary sodium restriction to 3 grams may be most beneficial for patients in NYHA functional Classes III and IV.
  • The study suggests a potential differential effect of sodium intake on cardiac events based on HF severity.
  • Further research is warranted to confirm these findings and refine sodium intake guidelines for HF management.
Abstract

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