Abstract
Objective: The present study aimed to assess the influence of hypomagnesemia (hypoMg) on the risk of developing contrast-induced nephropathy (CIN) after coronary angiography.
 Methods: This is a single-center prospective, observational study conducted at a tertiary referral hospital. Between December 31, 2016, and February 28, 2021, 223 patients who had undergone coronary angiography procedures and had preprocedural baseline Mg levels were enrolled in this study. CIN was defined as an increase of >0.5 mg/dl or >25 % in serum creatinine concentration over baseline within 48-72 h after administration. HypoMg was defined as Mg< 1.60 mg/dL. 
 Results: Of 223 patients enrolled, CIN occurred in 28 patients (12.6%). CIN occurred in 36.4 % of the patients with hypoMg and 11.3 % of those with non-hypoMg (P=0.02). Multivariate logistic regression analysis found that baseline Mg levels were independent predictors of CIN. 
 Conclusion: HypoMg was associated with an increased risk for CIN. These results suggest magnesium replacement in hypomagnesemia may be beneficially indicated before diagnostic/interventional studies using contrast media.
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