ESC Heart Failure (Oct 2024)

U‐shaped association between serum calcium and in‐hospital mortality in patients with congestive heart failure

  • Kai Zhang,
  • Yu Han,
  • Tianyi Cai,
  • Fangming Gu,
  • Zhaoxuan Gu,
  • JiaYu Zhao,
  • Jianguo Chen,
  • Bowen Chen,
  • Min Gao,
  • Zhengyan Hou,
  • Xiaoqi Yu,
  • Yafang Gao,
  • Rui Hu,
  • Jinyu Xie,
  • Tianzhou Liu,
  • MaoXun Huang

DOI
https://doi.org/10.1002/ehf2.14730
Journal volume & issue
Vol. 11, no. 5
pp. 2521 – 2530

Abstract

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Abstract Aims Serum calcium level is widely used for evaluating disease severity, but its impact on clinical outcomes in patients with congestive heart failure (CHF) remains poorly understood. The aim of this study is to investigate the relationship between serum calcium levels and in‐hospital mortality in CHF patients. Methods and results We conducted a retrospective analysis utilizing clinical data from the Medical Information Mart for Intensive Care database, encompassing a cohort of 15 983 CHF patients. This cohort was stratified based on their serum calcium levels, with the primary objective being the determination of in‐hospital mortality. To assess the impact of admission serum calcium levels on in‐hospital mortality, we employed various statistical methodologies, including multivariable logistic regression models, a generalized additive model, a two‐piecewise linear regression model, and subgroup analysis. Comparative analysis of the reference group (Q3) revealed increased in‐hospital mortality in the first quintile (Q1, the group with the lowest blood calcium level) and the fifth quintile (Q5, the group with the highest blood calcium level), with fully adjusted odds ratios of 1.38 [95% confidence interval (CI): 1.13–1.68, P = 0.002] and 1.23 (95% CI: 1.01–1.5, P = 0.038), respectively. A U‐shaped relationship was observed between serum calcium levels and in‐hospital mortality, with the lowest risk occurring at a threshold of 8.35 mg/dL. The effect sizes and corresponding CIs below and above this threshold were 0.782 (95% CI: 0.667–0.915, P = 0.0023) and 1.147 (95% CI: 1.034–1.273, P = 0.0094), respectively. Stratified analyses confirmed the robustness of this correlation. Conclusions Our study identifies a U‐shaped association between serum calcium levels and in‐hospital mortality in CHF patients, with a notable inflection point at 8.35 mg/dL. Further investigation through prospective, randomized, and controlled studies is warranted to validate the findings presented in this study.

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