Efficacy and safety of intermittent bolus compared with continuous drip of 3%NaCl in patients with severe symptomatic hyponatremia in Rajavithi Hospital

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Orakan Lanwong
Kumtorn Lelamali


Background: Recently, the European Renal Best Practices (ERBP) recommended bolus 3%NaCl 150 mL every 20 min to target plasma sodium (pNa) of 5 mEq/L during the first hour among patients with severe symptomatic hyponatremia. This recommendation was based on expert opinions reported in small scale studies.

Methods: This constituted a single center, open label, randomized controlled trial including patients with severe symptomatic hyponatremia (pNa <125 mEq/L). Patients were randomized to an intermittent bolus group (IB) treated with 150 mL of 3%NaCl every 20 mins and a continuous drip group (CD) treated with 1 mL/kg/h of 3%NaCl to achieve the target pNa ≥5 mEq/L to improve symptoms. The primary end points were changes in pNa and Glasglow Coma Scale (GCS) at the 6th hour.

Results: Seven patients were randomized to IB and 6 patients to CD. Four patients were terminated during the study, 2 patients in IB and 2 patients in the CD group, respectively. The IB group exhibited higher serum urea and uric acid than the CD group. No differences were found regarding changes of pNa and GCS at the 6th hour between IB and CD groups. Time to target pNa and time to normalize symptoms trended to be less in the IB group. Overcorrection rate at the 24th and 48th hour tended to be less in the IB group. Two patients in the CD group needed relowered protocol. No differences were found in changes of pNa, and GCS at the 24th and 48th hour including length of hospital stay, and no ODS or mortality rate changes were noted in 30 days.

Conclusion: Changes of pNa and GCS after correcting hyponatremia with 3%NaCl intermittent bolus compared with continuous drip did not significantly differ by preliminary analysis. Intermittent bolus showed a trend to achieve target pNa and cure pNa symptoms rapidly.

Trial registration: ClinicalTrials.gov identifier: NCT04561531


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Lanwong, O., & Lelamali, K. (2022). Efficacy and safety of intermittent bolus compared with continuous drip of 3%NaCl in patients with severe symptomatic hyponatremia in Rajavithi Hospital. Journal of the Nephrology Society of Thailand, 28(2), 68–80. Retrieved from https://he01.tci-thaijo.org/index.php/JNST/article/view/258807
Original Article


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