A groundbreaking study from Korea has revealed an intriguing finding: two distinct fluid replacement approaches, rapid intermittent bolus (RIB) and slow continuous infusion (SCI), demonstrate comparable efficacy and safety in treating severe hypernatremia. But here's the twist: despite the bolus method's faster initial correction and lower fluid volume, the overall outcomes are remarkably similar.
Unveiling the SALSA II Trial
The SALSA II Trial, led by Sejoong Kim and colleagues, is set to be presented at the 2025 American Society of Nephrology Kidney Week meeting. This prospective, multicenter study enrolled 178 patients with high serum sodium levels (155 mmol/L or higher) between June 2021 and January 2025. Participants were randomly assigned to receive either intermittent boluses or continuous infusions of electrolyte-free water.
The primary focus was on rapid sodium correction, defined as a significant reduction within 24 hours or reaching a level of 150 mmol/L or lower. And the results are eye-opening.
Rapid vs. Slow: A Balanced Battle
Rapid correction was achieved in an impressive 91.0% of patients treated with RIB, while the SCI group closely followed at 88.8% (P=0.62). The RIB group experienced a more rapid sodium decline within the first 6 hours (-4.7 ± 2.6 vs -3.6 ± 2.6 mmol/L; P=0.004) and required less total fluid over 48 hours (1,976 ± 1,285 vs 2,506 ± 1,705 mL; P=0.04). However, the target correction rates, overcorrection rates, and 28-day survival rates were remarkably similar between the two groups.
The Takeaway: A Simplified Approach
The investigators concluded that both methods effectively lowered serum sodium without significant differences in primary or safety outcomes. The intermittent bolus approach's ability to achieve faster initial reduction with lower fluid volumes suggests a potential advantage in preventing fluid overload. This finding supports the feasibility of a simplified correction protocol, eliminating the need for complex electrolyte-free water clearance calculations.
So, which method would you choose, and why? Share your thoughts in the comments! The debate is open!
