Hypochloraemia is strongly and independently associated with mortality in patients with chronic heart failure

Jeffrey M. Testani, Jennifer S. Hanberg, Juan Pablo Arroyo, Meredith A. Brisco, Jozine M. ter Maaten, F. Perry Wilson, Lavanya Bellumkonda, Daniel Jacoby, W. H.Wilson Tang, Chirag R. Parikh

Research output: Contribution to journalArticle

Abstract

Aims: Hyponatraemia is strongly associated with adverse outcomes in heart failure. However, accumulating evidence suggests that chloride may play an important role in renal salt sensing and regulation of neurohormonal and sodium-conserving pathways. Our objective was to determine the prognostic importance of hypochloraemia in patients with heart failure. Methods and results: Patients in the BEST trial with baseline serum chloride values were evaluated (n = 2699). Hypochloraemia was defined as a serum chloride ≤96 mmol/L and hyponatraemia as serum sodium ≤135 mmol/L. Hypochloraemia was present in 13.0% and hyponatraemia in 13.7% of the population. Chloride and sodium were only modestly correlated (r = 0.53), resulting in only 48.7% of hypochloraemic patients having concurrent hyponatraemia. Both hyponatraemia and hypochloraemia identified a population with greater disease severity; however, renal function tended to be worse and loop diuretic doses higher with hypochloraemia. In univariate analysis, lower serum sodium or serum chloride as continuous parameters were each strongly associated with mortality (P < 0.001). However, when both parameters were included in the same model, serum chloride remained strongly associated with mortality [hazard ratio (HR) 1.3 per standard deviation decrease, 95% confidence interval (CI) 1.18–1.42, P < 0.001], whereas sodium was not (HR 0.97 per standard deviation decrease, 95% CI 0.89–1.06, P = 0.52). Conclusion: Serum chloride is strongly and independently associated with worsened survival in patients with chronic heart failure and accounted for the majority of the risk otherwise attributable to hyponatraemia. Given the critical role of chloride in a number of regulatory pathways central to heart failure pathophysiology, additional research is warranted in this area.

Original languageEnglish (US)
Pages (from-to)660-668
Number of pages9
JournalEuropean Journal of Heart Failure
Volume18
Issue number6
DOIs
StatePublished - Jun 1 2016

Keywords

  • Heart failure
  • Hypochloraemia
  • Hyponatraemia
  • Mortality
  • Serum chloride
  • Serum sodium

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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    Testani, J. M., Hanberg, J. S., Arroyo, J. P., Brisco, M. A., ter Maaten, J. M., Wilson, F. P., Bellumkonda, L., Jacoby, D., Tang, W. H. W., & Parikh, C. R. (2016). Hypochloraemia is strongly and independently associated with mortality in patients with chronic heart failure. European Journal of Heart Failure, 18(6), 660-668. https://doi.org/10.1002/ejhf.477