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Original research article
Hyponatraemia and its prognosis in acute heart failure is related to right ventricular dysfunction
  1. Heesun Lee1,
  2. Sang Eun Lee2,
  3. Chan Soon Park3,
  4. Jin Joo Park4,
  5. Ga Yeon Lee5,
  6. Min-Seok Kim2,
  7. Jin-Oh Choi5,
  8. Hyun-jai Cho3,
  9. Hae-Young Lee3,
  10. Dong-Ju Choi4,
  11. Eun-Seok Jeon5,
  12. Jae-Joong Kim2,
  13. Byung-Hee Oh3
  1. 1Division of Cardiology, Healthcare System Gangnam Center, Seoul National University Hospital, Seoul, Korea
  2. 2Department of Cardiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
  3. 3Division of Cardiology, Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
  4. 4Department of Cardiology, Cardiovascular Center, Seoul National University Bundang Hospital, Seongnam, Korea
  5. 5Division of Cardiology, Department of Internal Medicine, Heart Vascular Stroke Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
  1. Correspondence to Dr Sang Eun Lee, Department of Cardiology, Asan Medical Center, University of Ulsan College of Medicine, 88 Olympic-ro 43-gil, Songpa-gu, Seoul 138-736, Korea; sangeunlee.md{at}gmail.com

Abstract

Objectives Hyponatraemia is a well-known predictor of clinical outcomes in heart failure (HF). However, the mechanism remains poorly understood. Previous reports suggest that hyponatraemia is related to right HF. We sought to evaluate the association between right ventricular (RV) dysfunction and hyponatraemia, and the impact of this relationship on the prognosis of patients with acute heart failure (AHF).

Methods This is a nested case–control study of the Korean Acute Heart Failure registry. Among 2935 AHF patients enrolled prospectively and consecutively at four tertiary hospitals in Korea from 2011 to 2014, 116 patients with severe persistent hyponatraemia, defined as serum sodium level <130 mmol/L at admission and <135 mmol/L before discharge, were matched with 232 controls, based on propensity scores for hyponatraemia. RV function was assessed with fractional area change (FAC) by echocardiography.

Results RV dysfunction (FAC <35%) was more prevalent in patients with severe persistent hyponatraemia than in those without (81.0% vs 33.6%, p<0.001). Hyponatraemia was strongly associated with RV dysfunction (adjusted OR 8.00, 95% CI 4.50 to 14.22, p<0.001), but not with left ventricular dysfunction (adjusted OR 1.21, 95% CI 0.74 to 1.50, p=0.308). RV dysfunction was an independent predictor of all-cause mortality, after adjustment for hyponatraemia (adjusted HR 2.20, 95% CI 1.53 to 3.15, p<0.001), while hyponatraemia was not (adjusted HR 1.33, 95% CI 0.94 to 1.87, p=0.108).

Conclusions In patients with AHF, hyponatraemia was more common with RV dysfunction. RV dysfunction, rather than hyponatraemia, was more significantly related with patients’ prognosis. Thus, the utility of RV dysfunction instead of hyponatraemia per se should be considered in HF risk models.

Trial registration number Korean Acute Heart Failure registryNCT01389843;Results.

  • echocardiography
  • heart failure

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Footnotes

  • Contributors Conception and design, HL, SEL, HJC, HYL, BHO; data acquisition, HL, SEL, CSP, JJP, GYL, MK; data analysis and interpretation, HL, SEL, CSP; statistical analysis, HL, SEL; drafting and finalising the article, HL, SEL, BHO; critical revision of the article for important intellectual content, HL, SEL, JJP, GYL, HJC, HYL, DJC, JOC, ESJ, JJK.

  • Funding This work was supported by grants from the Research of Korea Centres for Disease Controland Prevention [2010-E63003-00, 2011-E63002-00, 2012-E63005-00, 2013-E63003-00,2013-E63003-01, 2013-E63003-02, and 2016-ER6303-00].

  • Competing interests None declared.

  • Patient consent Obtained.

  • Ethics approval Seoul National University Hospital, Asan Medical Center, Seoul National University Bundang Hospital, Samsung Medical Center.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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