Background: We aimed to determine the optimal range of discharge serum magnesium in hospitalized patients by evaluating one-year mortality risk according to discharge serum magnesium.
Methods: This was a single-center cohort study of hospitalized adult patients who survived until hospital discharge. We classified discharge serum magnesium, defined as the last serum magnesium within 48 hours of hospital discharge, into ≤1.6, 1.7-1.8, 1.9-2.0, 2.1-2.2, and ≥2.3 mg/dL. We assessed one-year mortality risk after hospital discharge based on discharge serum magnesium, using discharge magnesium of 2.1-2.2 mg/dL as the reference group.
Results: Of 39,193 eligible patients, 8%, 23%, 34%, 23%, and 12% had a serum magnesium of ≤1.6, 1.7-1.8, 1.9-2.0, 2.1-2.2, and ≥2.3 mg/dL, respectively, at hospital discharge. After the adjustment for several confounders, discharge serum magnesium of ≤1.6, 1.7-1.8, and ≥2.3 mg/dL were associated with higher one-year mortality with hazard ratio of 1.35 (95% CI 1.21-1.50), 1.14 (95% CI 1.06-1.24), and 1.17 (95% CI 1.07-1.28), respectively, compared to discharge serum magnesium of 2.1-2.2 mg/dL. There was no significant difference in one-year mortality between patients with discharge serum magnesium of 1.9-2.0 and 2.1-2.2 mg/dL.
Conclusion: The optimal range of serum magnesium at discharge was 1.9-2.2 mg/dL. Both hypomagnesemia and hypermagnesemia at discharge were associated with higher one-year mortality.
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