Laboratory Medicine ›› 2021, Vol. 36 ›› Issue (8): 823-827.DOI: 10.3969/j.issn.1673-8640.2021.08.009

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Correlation of serum magnesium level with body composition and survival in hemodialysis patients

QIAN Xiangbei1, WU Zhiming2   

  1. 1. Department of Clinical Laboratory,Wenchang People's Hospital,Wenchang 571300,Hainan,China
    2. Department of Clinical Laboratory,the Second Affiliated Hospital of Hainan Medical University,Haikou 570216,Hainan,China
  • Received:2020-12-14 Online:2021-08-30 Published:2021-08-30

Abstract:

Objective To investigate the relationship between serum magnesium level and body composition (somatic cell mass index,over-hydration,over-hydration/extracellular water ratio,non-adipose tissue index and adipose tissue index)and 3-year cumulative survival rate in hemodialysis patients. The baseline(initial examination) clinical data of patients were collected,and serum magnesium,beta2-microglobulin(β2-MG),hemoglobin(Hb),albumin(Alb),C-reactive protein(CRP),serum calcium,parathyroid hormone,phosphate and body composition were determined. All the patients were classified into 3 groups according to serum magnesium levels(low-level magnesium group,middle-level magnesium group and high-level magnesium group). Logistic regression analysis was used to evaluate the risk factors of hypomagnesemia(serum magnesium <0.73 mmol/L) in hemodialysis patients. Kaplan-Meier analysis was used to compare the 3-year cumulative all-cause survival. Cox regression analysis was used to determine the risk factors of 3-year all-cause mortality in hemodialysis patients. Results Compared with the middle-level magnesium group and the high-level magnesium group,the low-level magnesium group was elder(P<0.05),the dialysis time was shorter(P<0.05),the serum CRP level and over-hydration/extracellular water ratio were higher(P<0.05),serum Alb level and somatic cell mass index were lower(P<0.05),and the over-hydration was higher(P<0.05). There was no statistical significance in the other items among the 3 groups(P>0.05). Logistic regression analysis showed that dialysis time and over-hydration/extracellular water ratio were risk factors for hypomagnesemia in hemodialysis patients [odds ratios(OR) were 1.04 and 1.02,95% confidence intervals(CI) were 1.01-1.08 and 1.00-1.04,respectively]. When adjusted for age,sex,body mass index(BMI),the history of diabetes mellitus and blood pressure,hypomagnesemia [hazard ratio(HR)=1.71,95%CI 1.04-2.52] and Alb(HR=1.79,95%CI 1.71-1.98) were risk factors for increased mortality in hemodialysis patients. Conclusions Hypomagnesemia is correlated with dialysis time and over-hydration/extracellular water ratio,which is an independent risk factor for 3-year cumulative survival of hemodialysis patients.

Key words: Magnesium, Body composition, Hemodialysis, Survival rate

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