Serum Magnesium Is Inversely Associated With Heart Failure, Atrial Fibrillation, and Microvascular Complications in Type 2 Diabetes

<p><b>Objective</b></p> <p>We investigated whether serum magnesium (Mg²⁺) was prospectively associated with macro- or microvascular complications and mediated by glycemic control (Hemoglobin A_1c (HbA_1c)), in T2D.</p> <p> </p> <p><b>Research Design and Methods</b></p> <p>We analyzed in 4,348 participants the association of serum Mg²⁺ with macrovascular disease and mortality (acute myocardial infarction (AMI), coronary heart disease (CHD), heart failure (HF), cerebrovascular accident (CVA), peripheral arterial disease (PAD)), atrial fibrillation (AF) and microvascular complications (chronic kidney disease (CKD), diabetic retinopathy and diabetic foot) using Cox regression, adjusted for confounders. Mediation analysis was performed to assess whether HbA_1c mediated these associations.</p> <p> </p> <p><b>Results</b></p> <p>The average baseline serum Mg²⁺ concentration was 0.80 ± 0.08 mmol/L. Serum Mg²⁺ was during 6.1 years of follow-up inversely associated with major macrovascular 0.87 (95% CI: 0.76; 1.00), HF 0.76 (95% CI: 0.62; 0.93) and AF 0.59 (95% CI: 0.49; 0.72). Serum Mg²⁺ was not associated with AMI, CHD, CVA and PAD. Serum Mg²⁺ was during 5.1 years of follow-up inversely associated withoverall microvascular events 0.85 (95% CI: 0.78; 0.91), 0.89 (95% CI: 0.82; 0.96) for CKD, 0.77 (95% CI: 0.61; 0.98) for diabetic retinopathy and 0.85 (95% CI: 0.78; 0.92) for diabetic foot. HbA_1c mediated the associations of serum Mg²⁺with HF, overall microvascular events, diabetic retinopathy and diabetic foot.</p> <p> </p> <p><b>Conclusions</b></p> <p>Serum Mg²⁺ concentration is inversely associated with the risk to develop HF, AF and with the occurrence of CKD, diabetic retinopathy and foot complications, in T2D. Glycemic control partially mediated the association of serum Mg²⁺ with HF and microvascular complications. </p>