Browsing by Author "Costello, Rebecca B."

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    The Circulating Concentration and 24-h Urine Excretion of Magnesium Dose- and Time-Dependently Respond to Oral Magnesium Supplementation in a Meta-Analysis of Randomized Controlled Trials
    (Oxford, 2016-03) Zhang, Xi; Del Gobbo, Liana C.; Hruby, Adela; Rosanoff, Andrea; He, Ka; Dai, Qi; Costello, Rebecca B.; Zhang, Wen; Song, Yiqing; Epidemiology, School of Public Health
    Background: Accurate determination of Mg status is important for improving nutritional assessment and clinical risk stratification. Objective: We aimed to quantify the overall responsiveness of Mg biomarkers to oral Mg supplementation among adults without severe diseases and their dose- and time responses using available data from randomized controlled trials (RCTs). Methods: We identified 48 Mg supplementation trials (n = 2131) through searches of MEDLINE and the Cochrane Library up to November 2014. Random-effects meta-analysis was used to estimate weighted mean differences of biomarker concentrations between intervention and placebo groups. Restricted cubic splines were used to determine the dose- and time responses of Mg biomarkers to supplementation. Results: Among the 35 biomarkers assessed, serum, plasma, and urine Mg were most commonly measured. Elemental Mg supplementation doses ranged from 197 to 994 mg/d. Trials ranged from 3 wk to 5 y (median: 12 wk). Mg supplementation significantly elevated circulating Mg by 0.04 mmol/L (95% CI: 0.02, 0.06) and 24-h urine Mg excretion by 1.52 mmol/24 h (95% CI: 1.20, 1.83) as compared to placebo. Circulating Mg concentrations and 24-h urine Mg excretion responded to Mg supplementation in a dose- and time-dependent manner, gradually reaching a steady state at doses of 300 mg/d and 400 mg/d, or after ~20 wk and 40 wk, respectively (all P-nonlinearity ≤ 0.001). The higher the circulating Mg concentration at baseline, the lower the responsiveness of circulating Mg to supplementation, and the higher the urinary excretion (all P-linearity < 0.05). In addition, RBC Mg, fecal Mg, and urine calcium were significantly more elevated by Mg supplementation than by placebo (all P-values < 0.05), but there is insufficient evidence to determine their responses to increasing Mg doses. Conclusions: This meta-analysis of RCTs demonstrated significant dose- and time responses of circulating Mg concentration and 24-h urine Mg excretion to oral Mg supplementation.
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    Recommendation on an updated standardization of serum magnesium reference ranges
    (Springer, 2022-06-10) Rosanoff, Andrea; Wes, Christina; Elin, Ronald J.; Micke, Oliver; Baniasadi, Shadi; Barbagallo, Mario; Campbell, Emily; Cheng, Fu-Chou; Costello, Rebecca B.; Gamboa-Gomez, Claudia; Guerrero-Romero, Fernando; Gletsu-Miller, Nana; von Ehrlich, Bodo; Iotti, Stefano; Kahe, Ka; Kim, Dae Jung; Kisters, Klaus; Kolisek, Martin; Kraus, Anton; Maier, Jeanette A.; Maj-Zurawska, Magdalena; Merolle, Lucia; Nechifor, Mihai; Pourdowlat, Guitti; Shechter, Michael; Song, Yiqing; Teoh, Yee Ping; Touyz, Rhian M.; Wallace, Taylor C.; Yokota, Kuninobu; Wolf, Federica; the MaGNet Global Magnesium Project (MaGNet); Epidemiology, Richard M. Fairbanks School of Public Health
    Purpose Serum magnesium is the most frequently used laboratory test for evaluating clinical magnesium status. Hypomagnesemia (low magnesium status), which is associated with many chronic diseases, is diagnosed using the serum magnesium reference range. Currently, no international consensus for a magnesemia normal range exists. Two independent groups designated 0.85 mmol/L (2.07 mg/dL; 1.7 mEq/L) as the low cut-off point defining hypomagnesemia. MaGNet discussions revealed differences in serum magnesium reference ranges used by members’ hospitals and laboratories, presenting an urgent need for standardization. Methods We gathered and compared serum magnesium reference range values from our institutions, hospitals, and colleagues worldwide. Results Serum magnesium levels designating “hypomagnesemia” differ widely. Of 43 collected values, only 2 met 0.85 mmol/L as the low cut-off point to define hypomagnesemia. The remainder had lower cut-off values, which may underestimate hypomagnesemia diagnosis in hospital, clinical, and research assessments. Current serum magnesium reference ranges stem from “normal” populations, which unknowingly include persons with chronic latent magnesium deficit (CLMD). Serum magnesium levels of patients with CLMD fall within widely used “normal” ranges, but their magnesium status is too low for long-term health. The lower serum magnesium reference (0.85 mmol/L) proposed specifically prevents the inclusion of patients with CLMD. Conclusions Widely varying serum magnesium reference ranges render our use of this important medical tool imprecise, minimizing impacts of low magnesium status or hypomagnesemia as a marker of disease risk. To appropriately diagnose, increase awareness of, and manage magnesium status, it is critical to standardize lower reference values for serum magnesium at 0.85 mmol/L (2.07 mg/dL; 1.7 mEq/L).
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    The magnesium global network (MaGNet) to promote research on magnesium in diseases focusing on covid-19
    (JLE, 2021) Wolf, Federica I.; Maier, Jeanette A.; Rosanoff, Andrea; Barbagallo, Mario; Baniasadi, Shadi; Castiglioni, Sara; Cheng, Fu-Chou; Colaneri Day, Sherrie; Costello, Rebecca B.; Dominguez, Ligia J.; Elin, Ronald J.; Gamboa-Gomez, Claudia; Guerrero-Romero, Fernando; Kahe, Ka; Kisters, Klaus; Kolisek, Martin; Kraus, Anton; Iotti, Stefano; Mazur, Andre; Mercado-Atri, Moises; Merolle, Lucia; Micke, Oliver; Gletsu-Miller, Nana; Nielsen, Forrest; O-Uchi, Jin; Piazza, Ornella; Plesset, Michael; Pourdowlat, Guitti; Rios, Francisco J.; Rodriguez-Moran, Martha; Scarpati, Giuliana; Shechter, Michael; Song, Yiqing; Spence, Lisa A.; Touyz, Rhian M.; Trapani, Valentina; Veronese, Nicola; von Ehrlich, Bodo; Vormann, Juergen; Wallace, Taylor C.; CMER Center for Magnesium Education, Research; Gesellschaft für Magnesium-Forschung e.V. Germany; SDRM Society (International Society for the Development of Research on Magnesium); Epidemiology, School of Public Health