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Serum Calcium and Risk of Sudden Cardiac Arrest in the General Population

Published:September 21, 2017DOI:https://doi.org/10.1016/j.mayocp.2017.05.028

      Abstract

      Objective

      To evaluate the potential role of low serum Ca levels in the occurrence of sudden cardiac arrest (SCA) in the community.

      Patients and Methods

      We compared 267 SCA cases [177 (66%) men] and 445 controls [314 (71%) men] from a large population-based study (catchment population ∼1 million individuals) in the US Northwest from February 1, 2002, through December 31, 2015. Patients were included if their age was 18 years or older with available creatinine clearance (CrCl) and serum electrolyte levels for analyses to enable adjustment for renal function. For cases, creatinine clearance and electrolyte levels were required to be measured within 90 days of the SCA event.

      Results

      Cases of SCA had higher proportions of blacks [31 (12%) vs 14 (3%); P<.001], diabetes mellitus [122 (46%) vs 126 (28%); P<.001], and chronic kidney disease [102 (38%) vs 73 (16%); P<.001] than did controls. In multivariable logistic regression analysis, a 1-unit decrease in Ca levels was associated with a 1.6-fold increase in odds of SCA (odds ratio, 1.63; 95% CI, 1.06-2.51). Blood Ca levels lower than 8.95 mg/dL (to convert to mmol/L, multiply by 0.025) were associated with a 2.3-fold increase in odds of SCA as compared with levels higher than 9.55 mg/dL (odds ratio, 2.33; 95% CI, 1.17-4.61). Cases of SCA had significantly prolonged corrected QT intervals on the 12-lead electrocardiogram than did controls (465±37 ms vs 425±33 ms; P<.001).

      Conclusion

      Lower serum Ca levels were independently associated with an increased risk of SCA in the community.

      Abbreviations and Acronyms:

      CAD (coronary artery disease), CrCl (creatinine clearance), HMO (health maintenance organization), LVEF (left ventricular ejection fraction), OR (odds ratio), SCA (sudden cardiac arrest)
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      Linked Article

      • Serum Calcium and Risk of Sudden Cardiac Arrest in the General Population
        Mayo Clinic ProceedingsVol. 93Issue 3
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          We were pleased to read the article by Yarmohammadi et al1 in the October 2017 issue of Mayo Clinic Proceedings, in which they reported an independent association between low calcium levels and an increased risk of sudden cardiac arrest (SCA). We applaud their methodology and focused exploration of possible causal mechanisms of cardiac arrest. However, we are concerned about the weak physiologic basis for their findings, the range of calcium values discussed in the article, and the potential harm to the general population if calcium levels become a target for intervention.
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