Xiao Yang1, Melissa Soohoo2, Elani Streja2, Matthew B Rivara3, Yoshitsugu Obi2, Scott V Adams3, Kamyar Kalantar-Zadeh2, Rajnish Mehrotra4. 1. Department of Nephrology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China. 2. University of California Irvine, Orange, CA. 3. Kidney Research Institute and Harborview Medical Center, Division of Nephrology, University of Washington, Seattle, WA. 4. Kidney Research Institute and Harborview Medical Center, Division of Nephrology, University of Washington, Seattle, WA. Electronic address: rmehrotr@uw.edu.
Abstract
BACKGROUND: Prior studies have shown the association of low serum magnesium levels with adverse health outcomes in patients undergoing hemodialysis. There is a paucity of such studies in patients undergoing peritoneal dialysis (PD). STUDY DESIGN: Cohort study. SETTING & PARTICIPANTS: 10,692 patients treated with PD from January 1, 2007, through December 31, 2011, in facilities operated by a single large dialysis organization in the United States. PREDICTOR: Baseline serum magnesium levels, examined as 5 categories (<1.8, 1.8-<2.0, 2.0-<2.2 [reference], 2.2-<2.4, and ≥2.4mg/dL). OUTCOMES: Time to first hospitalization and time to death using competing-risks regression models. RESULTS: The distribution of baseline serum magnesium levels in the cohort was <1.8mg/dL, 1,928 (18%); 1.8 to <2.0mg/dL, 2,204 (21%); 2.0 to <2.2mg/dL, 2,765 (26%); 2.2 to <2.4mg/dL, 1,765 (16%); and ≥2.4mg/dL, 2,030 (19%). Of 10,692 patients, 6,465 (60%) were hospitalized at least once and 1,392 (13%) died during follow-up (median, 13; IQR, 7-23 months). Baseline serum magnesium level < 1.8mg/dL was associated with higher risk for hospitalization and all-cause mortality after adjustment for demographic and clinical characteristics (adjusted HRs of 1.23 [95% CI, 1.14-1.33] and 1.21 [95% CI, 1.03-1.42], respectively). The higher risk for hospitalization persisted upon adjustment for laboratory variables, whereas that for all-cause mortality was attenuated to a nonsignificant level. The greatest risk for hospitalization was in patients with low serum albumin levels (<3.5g/dL; P for interaction < 0.001). LIMITATIONS: Possibility of residual confounding by unmeasured variables cannot be excluded. CONCLUSIONS: Lower serum magnesium levels may be associated with higher risk for hospitalization in incident PD patients, particularly those with hypoalbuminemia. Additional studies are needed to confirm these findings and investigate whether correction of hypomagnesemia reduces these risks.
BACKGROUND: Prior studies have shown the association of low serum magnesium levels with adverse health outcomes in patients undergoing hemodialysis. There is a paucity of such studies in patients undergoing peritoneal dialysis (PD). STUDY DESIGN: Cohort study. SETTING & PARTICIPANTS: 10,692 patients treated with PD from January 1, 2007, through December 31, 2011, in facilities operated by a single large dialysis organization in the United States. PREDICTOR: Baseline serum magnesium levels, examined as 5 categories (<1.8, 1.8-<2.0, 2.0-<2.2 [reference], 2.2-<2.4, and ≥2.4mg/dL). OUTCOMES: Time to first hospitalization and time to death using competing-risks regression models. RESULTS: The distribution of baseline serum magnesium levels in the cohort was <1.8mg/dL, 1,928 (18%); 1.8 to <2.0mg/dL, 2,204 (21%); 2.0 to <2.2mg/dL, 2,765 (26%); 2.2 to <2.4mg/dL, 1,765 (16%); and ≥2.4mg/dL, 2,030 (19%). Of 10,692 patients, 6,465 (60%) were hospitalized at least once and 1,392 (13%) died during follow-up (median, 13; IQR, 7-23 months). Baseline serum magnesium level < 1.8mg/dL was associated with higher risk for hospitalization and all-cause mortality after adjustment for demographic and clinical characteristics (adjusted HRs of 1.23 [95% CI, 1.14-1.33] and 1.21 [95% CI, 1.03-1.42], respectively). The higher risk for hospitalization persisted upon adjustment for laboratory variables, whereas that for all-cause mortality was attenuated to a nonsignificant level. The greatest risk for hospitalization was in patients with low serum albumin levels (<3.5g/dL; P for interaction < 0.001). LIMITATIONS: Possibility of residual confounding by unmeasured variables cannot be excluded. CONCLUSIONS: Lower serum magnesium levels may be associated with higher risk for hospitalization in incident PDpatients, particularly those with hypoalbuminemia. Additional studies are needed to confirm these findings and investigate whether correction of hypomagnesemia reduces these risks.
Authors: Lin Li; Elani Streja; Connie M Rhee; Rajnish Mehrotra; Melissa Soohoo; Steven M Brunelli; Csaba P Kovesdy; Kamyar Kalantar-Zadeh Journal: Am J Kidney Dis Date: 2015-07-14 Impact factor: 8.860
Authors: Akshay Varghese; Eduardo Lacson; Jessica M Sontrop; Rey R Acedillo; Ahmed A Al-Jaishi; Sierra Anderson; Amit Bagga; Katie L Bain; Laura L Bennett; Clara Bohm; Pierre A Brown; Christopher T Chan; Brenden Cote; Varun Dev; Bonnie Field; Claire Harris; Shasikara Kalatharan; Mercedeh Kiaii; Amber O Molnar; Matthew J Oliver; Malvinder S Parmar; Melissa Schorr; Nikhil Shah; Samuel A Silver; D Michael Smith; Manish M Sood; Irina St Louis; Karthik K Tennankore; Stephanie Thompson; Marcello Tonelli; Hans Vorster; Blair Waldvogel; James Zacharias; Amit X Garg Journal: Can J Kidney Health Dis Date: 2020-10-22