Calcium mass balances during standard bicarbonate hemodialysis and long-hour slow-flow bicarbonate hemodialysis.

Abstract:

BACKGROUND:Dialysate calcium (Ca) concentration should be viewed as part of the integrated therapeutic regimen to control renal osteodystrophy and maintain normal mineral metabolism. Thus, a correct ionized calcium mass balance (Ca++MB) during hemodialysis (HD) is crucial in the treatment of renal osteodystrophy. The GENIUS single-pass batch dialysis system (Fresenius Medical Care, Germany) consists of a closed dialysate tank of 90 L; it offers the opportunity of effecting mass balances of any solute in a very precise way. METHODS:The present study has a crossover design: 11 stable anuric HD patients underwent 2 bicarbonate HD sessions, 1 of 4 hours (4h) and the other of 8 hours (8h) in a random sequence, always at the same interdialytic interval, at least 1 week apart. The GENIUS system and high-flux FX80 dialyzers (Fresenius Medical Care, Germany) were used. The volume of blood and dialysate processed, volume of ultrafiltration and dialysate Ca concentrations (1.50 mmol/L) were prescribed to be the same. Trends of plasma Ca++, blood pH and bicarbonates during dialysis, as well as Ca++MBs were determined. Plasma parathyroid hormone (PTH) levels at the start and end of the 2 treatments were measured. RESULTS:Ca++MBs (mean ± SD) were +284.6 ± 137.4 mg and +297.7 ± 131.6 mg (p=0.307) in the 4h and 8h treatments, respectively. No single session out of the 22 had a negative Ca++MB for the patient. Mean plasma Ca++, blood pH and bicarbonate levels were not statistically significantly different when comparing the start and end of the sessions of the 2 treatments. Mean plasma Ca++, blood pH and bicarbonate levels increased significantly along the time points in both 4h and 8h HD sessions (repeated measures ANOVA: p<0.0001). Mean plasma PTH levels were not statistically significantly different when comparing the start and end of the sessions of the 2 treatments. The differences between predialysis and postdialysis plasma PTH levels were not statistically significantly different either in 4h or 8h sessions (Wilcoxon's test: p=NS), even though a trend toward lower postdialysis plasma PTH levels was observed in both 4h and 8h treatments. CONCLUSIONS:Our data show incontrovertibly that, when dialyzing with a dialysate Ca concentration of 1.50 mmol/L, 4h standard bicarbonate HD and 8h slow-flow bicarbonate HD always achieve a quite similar positive Ca++MB for the patients.

journal_name

J Nephrol

journal_title

Journal of nephrology

authors

Basile C,Libutti P,Di Turo AL,Tundo S,Maselli P,Casucci F,Losurdo N,Teutonico A,Vernaglione L,Lomonte C

doi

10.5301/JN.2011.6385

subject

Has Abstract

pub_date

2011-11-01 00:00:00

pages

742-8

issue

6

eissn

1121-8428

issn

1724-6059

pii

776ABCD3-3AB7-437F-BFF1-9DE0DF23EA5E

journal_volume

24

pub_type

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