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NDT Advance Access published online on February 18, 2008
Nephrology Dialysis Transplantation, doi:10.1093/ndt/gfm932
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© The Author [2008]. Published by Oxford University Press on behalf of ERA-EDTA. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org


Correction of hypervolaemic hypernatraemia by inducing negative Na+ and K+ balance in excess of negative water balance: a new quantitative approach

Minhtri K. Nguyen and Ira Kurtz

Department of Medicine, UCLA Medical Center, Los Angeles, CA, USA

Correspondence and offprint requests to: Minhtri K. Nguyen, Division of Nephrology, David Geffen School of Medicine at UCLA, 10833 Le Conte Avenue, Room 7-155 Factor Building, Los Angeles, CA 90095, USA. Tel: +1-310-206-6741; Fax: +1-310-825-6309; E-mail: mtnguyen{at}mednet.ucla.edu



  Abstract

Hypervolaemic hypernatraemia is caused by an increase in total exchangeable Na+ and K+ in excess of an increment in total body H2O (TBW). Unlike patients with hypervolaemic or euvolaemic hypernatraemia, treatment needs to be targeted at correcting not only the elevated plasma Na+ concentration, but also, there is an additional requirement to achieve negative H2O balance to correct the increment in TBW. These seemingly conflicting therapeutic goals are typically approached by administering intravenous 5% dextrose (IV D5W) and furosemide. Correction of hypervolaemic hypernatraemia can be attained by ensuring that the negative Na+ and K+ balance exceeds the negative H2O balance. Currently, there is no quantitative approach to predicting the volume of IV D5W (VIVF) that needs to be administered that satisfies these requirements. Therefore, based on the principle of mass balance and the empirical relationship between exchangeable Na+, K+, TBW and the plasma Na+ concentration, we have derived a new equation that calculates the volume of IV D5W (VIVF) needed to lower the plasma Na+ concentration ([Na+]p1) to a targeted level ([Na+]p2) by achieving the desired amount of negative H2O balance (VMB): VIVF = {([Na+]p1 + 23.8) (TBW1) – ([Na+]p2 + 23.8)(TBW1 + VMB) + 1.03 ([E]input x Vinput – [E]output x Voutput – [E]urine (Vinput – Voutput – VMB))}/1.03 x [E]urine where [E] = [Na+ + K+] and input and output refer to non-infusate and non-renal input and output, respectively. This new formula is the first quantitative approach for correcting hypervolaemic hypernatraemia by achieving negative Na+ and K+ balance in excess of negative H2O balance.

Keywords: dysnatraemia; hypernatraemia; hypervolaemia; sodium

Received for publication: 7.11.07
Accepted in revised form: 17.12.07


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