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Dialysate sodium concentration: The forgotten salt shaker
Norio Hanafusa1, Ken Tsuchiya1, Kosaku Nitta2
1Department of Blood Purification, Tokyo Women's Medical University, Tokyo, Japan.
Seminars in Dialysis
|October 22, 2018
Summary
Dialysate sodium concentration impacts fluid balance and blood pressure in dialysis patients. The sodium gradient, not just dialysate sodium, is key for clinical outcomes, but measurement challenges persist.
Area of Science:
- Nephrology
- Renal Medicine
- Dialysis Therapy
Background:
- Sodium balance is critical in end-stage renal disease (ESRD) patients undergoing hemodialysis.
- Dialysate sodium concentration (DNa) influences extracellular fluid volume and blood pressure.
- Low DNa may reduce weight gain and inflammation but can increase hypotension and cramps.
Purpose of the Study:
- To review the clinical effects of dialysate sodium concentration (DNa) in hemodialysis.
- To discuss basic aspects of sodium balance in ESRD patients.
- To highlight the importance of the sodium gradient in clinical outcomes.
Main Methods:
- Literature review of clinical effects of dialysate sodium.
- Discussion of sodium balance principles in hemodialysis.
- Analysis of factors influencing sodium flux and measurement.
Main Results:
- Low DNa can decrease interdialytic weight gain (IDWG) and blood pressure.
- Low DNa is associated with increased hypotensive episodes and muscle cramps.
- The sodium gradient (patient setpoint vs. DNa) correlates better with outcomes than DNa alone.
Conclusions:
- Dialysate sodium concentration is a crucial factor in hemodialysis patient management.
- The sodium gradient offers a more robust predictor of clinical outcomes than DNa.
- Challenges in sodium measurement and Donnan equilibrium effects require consideration.
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