Sistema FMUSP-HC: Faculdade de Medicina da Universidade de São Paulo (FMUSP) e Hospital das Clínicas da FMUSPGOLDENSTEIN, Patricia TaschnerGRACIOLLI, Fabiana GiorgetiANTUNES, Gisele LinsDOMINGUEZ, Wagner VasquesREIS, Luciene Machado dosMOE, SharonELIAS, Rosilene MottaJORGETTI, VandaMOYSES, Rosa Maria Affonso2018-09-132018-09-132018PLOS ONE, v.13, n.7, article ID e0198946, 14p, 20181932-6203https://observatorio.fm.usp.br/handle/OPI/28331Background Calcium gradient, the difference between serum calcium and dialysate calcium d[Ca], is the main contributor factor influencing calcium transfer during hemodialysis. The impact, however, of bone turnover, on calcium mass transfer during hemodialysis is still uncertain. Methods This prospective cross-sectional study included 10 patients on hemodialysis for a 57.6 +/- 16.8 months, with severe hyperparathyroidism. Patients were submitted to 3 hemodialysis sessions using d[Ca] of 1.25, 1.5 and 1.75 mmol/l in three situations: pre-parathyroidectomy (pre-PTX), during hungry bone (early post-PTX), and after stabilization of clinical status (late post-PTX). Biochemical analysis and calcium mass transfer were evaluated and serum bone-related proteins were quantified. Results Calcium mass transfer varied widely among patients in each study phase with a median of -89.5, -76.8 and -3 mmol using d[Ca] 1.25 mmol/L, -106, -26.8 and 29.7 mmol using d[Ca] 1.50 mmol/L, and 12.8, -14.5 and 38 mmol using d[Ca] 1.75 mmol/L during pre-PTX, early post-PTX and late post-PTX, respectively, which was significantly different among d[Ca] (p = 0.0001) and among phases (p = 0.040). Ca gradient and delta of Ca also differed among d [Ca] and phases (p<0.05 for all comparisons), whether ultrafiltration was similar. Serum Osteocalcin decreased significantly in late post-PTX, whereas Sclerostin increased earlier, in early post-PTX. Conclusions The skeleton plays a key role in Ca mass transfer during dialysis, either by determining pre-dialysis serum Ca or by controlling the exchangeable Ca pool. Knowing that could help us to decide which d[Ca] should be chosen in a given patient.engopenAccesschronic kidney-diseaselong-frequent hemodialysisadynamic bone-diseasedialysate calciumbicarbonate hemodialysismineral metabolismbalancehemodiafiltrationguidelineremovalarticleCopyright PUBLIC LIBRARY SCIENCE10.1371/journal.pone.0198946Multidisciplinary Sciences