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J Am Heart Assoc. 2016 Jan 22;5(1). pii: e002707. doi: 10.1161/JAHA.115.002707.

Serum Magnesium and the Risk of Death From Coronary Heart Disease and Sudden Cardiac Death.

Author information

1
Department of Epidemiology, Erasmus MC - University Medical Center Rotterdam, Rotterdam, The Netherlands (B.T.K., M.N.N., M.G.L., O.H.F., A.H., B.H.S.) Department of Internal Medicine, Erasmus MC - University Medical Center Rotterdam, Rotterdam, The Netherlands (B.T.K., R.Z., B.H.S., E.J.H.) Inspectorate for Health Care, Utrecht, The Netherlands (B.T.K., B.H.S.).
2
Department of Epidemiology, Erasmus MC - University Medical Center Rotterdam, Rotterdam, The Netherlands (B.T.K., M.N.N., M.G.L., O.H.F., A.H., B.H.S.).
3
Department of Epidemiology, Erasmus MC - University Medical Center Rotterdam, Rotterdam, The Netherlands (B.T.K., M.N.N., M.G.L., O.H.F., A.H., B.H.S.) Department of Cardiology, Erasmus MC - University Medical Center Rotterdam, Rotterdam, The Netherlands (M.G.L., J.W.D.) Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA (M.G.L., A.H.).
4
Department of Medical Informatics, Erasmus MC - University Medical Center Rotterdam, Rotterdam, The Netherlands (M.E.B.).
5
Department of Cardiology, Erasmus MC - University Medical Center Rotterdam, Rotterdam, The Netherlands (M.G.L., J.W.D.).
6
Department of Epidemiology, Erasmus MC - University Medical Center Rotterdam, Rotterdam, The Netherlands (B.T.K., M.N.N., M.G.L., O.H.F., A.H., B.H.S.) Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA (M.G.L., A.H.).
7
Department of Internal Medicine, Erasmus MC - University Medical Center Rotterdam, Rotterdam, The Netherlands (B.T.K., R.Z., B.H.S., E.J.H.).

Abstract

BACKGROUND:

Low serum magnesium has been implicated in cardiovascular mortality, but results are conflicting and the pathway is unclear. We studied the association of serum magnesium with coronary heart disease (CHD) mortality and sudden cardiac death (SCD) within the prospective population-based Rotterdam Study, with adjudicated end points and long-term follow-up.

METHODS AND RESULTS:

Nine-thousand eight-hundred and twenty participants (mean age 65.1 years, 56.8% female) were included with a median follow-up of 8.7 years. We used multivariable Cox proportional hazard models and found that a 0.1 mmol/L increase in serum magnesium level was associated with a lower risk for CHD mortality (hazard ratio: 0.82, 95% CI 0.70-0.96). Furthermore, we divided serum magnesium in quartiles, with the second and third quartile combined as reference group (0.81-0.88 mmol/L). Low serum magnesium (≤0.80 mmol/L) was associated with an increased risk of CHD mortality (N=431, hazard ratio: 1.36, 95% CI 1.09-1.69) and SCD (N=217, hazard ratio: 1.54, 95% CI 1.12-2.11). Low serum magnesium was associated with accelerated subclinical atherosclerosis (expressed as increased carotid intima-media thickness: +0.013 mm, 95% CI 0.005-0.020) and increased QT-interval, mainly through an effect on heart rate (RR-interval: -7.1 ms, 95% CI -13.5 to -0.8). Additional adjustments for carotid intima-media thickness and heart rate did not change the associations with CHD mortality and SCD.

CONCLUSIONS:

Low serum magnesium is associated with an increased risk of CHD mortality and SCD. Although low magnesium was associated with both carotid intima-media thickness and heart rate, this did not explain the relationship between serum magnesium and CHD mortality or SCD. Future studies should focus on why magnesium associates with CHD mortality and SCD and whether intervention reduces these risks.

KEYWORDS:

cardiovascular diseases; death, sudden; epidemiology; mortality; risk factors

Comment in

PMID:
26802105
PMCID:
PMC4859391
DOI:
10.1161/JAHA.115.002707
[Indexed for MEDLINE]
Free PMC Article

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