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Revista Cubana de Medicina

versión impresa ISSN 0034-7523

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BACALLAO MENDEZ, Raymed Antonio et al. Fractional excretion of magnesium and status of tubulointerstitium in nephrotic patients. Rev cubana med [online]. 2014, vol.53, n.4, pp.363-372. ISSN 0034-7523.

Introduction: fractional excretion of electrolytes can be used as an early marker of renal damage in glomerulopathies. Objective: to identify the possible relationship between some clinical variables, the fractional excretion of magnesium and the tubulointerstitial status in patients with nephrotic proteinuria assisted at The National Institute of Nephrology from April 2012 to June 2013. Methods: an observational analytical study was conducted. Patients with conditions that modify the fractional excretion of magnesium were excluded. 40 patients were included in this study at the Institute of Nephrology from April 2012 until June 2013, and their demographic, anthropometric and clinical data were collected; the fractional excretion of magnesium was measured as well. Renal biopsies were practiced to all patients and the percent of fibrosis was measured with the aid of image J program. Data were processed with Statistical package for Social Science (SPSS) version 15.0. The statistical technique of frequency distribution analysis was used; quantitative variables descriptive statistics were calculated. Wilcoxon tests, Kruskal Wallis and correlation coefficient Spearman's- rho were used in hypothesis tests. Results: the percent of interstitial fibrosis was related to fractional excretion of magnesium (rsp= 0,37, p= 0,02) and glomerular filtration rate (rsp= -0,56, p= 0,00). No association of the fractional excretion of magnesium with the use of drugs or with history of hypertension was found. Conclusions: tubulointerstitial fibrosis is related to the fractional excretion of magnesium and glomerular filtration rate in patients with nephrotic proteinuria.

Palabras clave : fractional excretion of magnesium; tubulointerstitial fibrosis; nephrotic syndrome; glomerular filtration rate.

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