Faster correction of severe hyponatremia reduces death and neurologic events

1. In this retrospective cohort study, faster 24-hour sodium correction rates were associated with lower risk of 90-day death or delayed neurologic events in severe hyponatremia.

2. Higher-risk patients experienced larger absolute benefits, while relative effects were consistent across groups.

Evidence Rating Level: 2 (Good)

Study Rundown: Current clinical guidelines recommend slow correction of significant hyponatremia, defined as a serum sodium concentration below 120 mEq/L, to reduce the risk of osmotic demyelination syndrome (ODS). However, concerns have been raised that overly slow correction may increase the risk of mortality and overall harm. This retrospective cohort study evaluated the association between sodium correction rates and the risk of death or delayed neurologic events in patients with severe hyponatremia. Compared with slow correction rates (<8 mEq/L over 24 hours), both medium (8–12 mEq/L) and fast (>12 mEq/L) correction rates were associated with a lower standardized risk of death or delayed neurologic events through 90 days. Fast correction rates also conferred lower risk compared with medium rates. When patients were stratified into quartiles based on estimated baseline risk, the absolute risk differences between medium or fast versus slow correction were more pronounced in higher-risk quartiles, although relative risk reductions were consistent across groups. Sensitivity analyses indicated that faster 48-hour correction rates (>18 mEq/L) were associated with reduced risk compared with slower rates (≤18 mEq/L), and an exploratory analysis suggested that the lowest predicted risk occurred at 24-hour correction rates around 20 mEq/L. The study’s generalizability is limited by potential residual confounding and retrospective coding of pre-existing neurologic diagnoses. Nevertheless, these findings suggest that faster sodium correction may be protective against mortality and delayed neurologic events, warranting a re-evaluation of current treatment guidelines.

Click to read this study in AIM

Relevant Reading: Correction Rates and Clinical Outcomes in Hospitalized Adults With Severe Hyponatremia

In-Depth [retrospective cohort]: This retrospective cohort study evaluated the association between sodium correction rates and death or delayed neurologic events in adults (≥18 years) admitted through the emergency department with serum sodium ≤120 mEq/L in the Kaiser Permanente Northern California system. Patients with serum glucose ≥400 mg/dL or without continuous health coverage during the year before and 3 months after admission were excluded. The primary outcome was a composite of death or delayed neurologic events within 90 days, defined as new diagnoses of demyelinating diseases (including ODS), hemiplegia/hemiparesis, other paralytic syndromes, epilepsy/recurrent seizure, or coma/altered consciousness. Secondary outcomes included each component and in-hospital death. A total of 16,021 patients were included (13,988 for 90-day outcomes, 2033 for in-hospital death). Median age was 74 years (interquartile range [IQR], 64–83), 63% were female, and common comorbidities included congestive heart failure (24%), liver disease (18%), and malnutrition (15%). Sodium correction over 24 hours was slow (<8 mEq/L) in 5980 (43%), medium (8–12 mEq/L) in 3609 (26%), and fast (>12 mEq/L) in 2551 (18%) patients. Death or delayed neurologic events occurred in 3000 of 13,988 patients (21%); 90-day delayed neurologic events in 587 (4%), 90-day death in 2554 (18%), and in-hospital death in 858 of 16,021 (5%). Compared with slow correction, medium and fast 24-hour rates were associated with lower standardized risk for the primary outcome (medium vs. slow: risk difference [RD], -5.6 percentage points [95% confidence interval [CI], -7.1 to -4.0]; fast vs. slow: RD, -9.0 [CI, -11.1 to -6.9]; fast vs. medium: RD, -3.4 [95% CI, -5.6 to -1.3]). Across risk quartiles, absolute risk differences increased with higher baseline risk. Subgroup analyses showed no effect modification. Sensitivity analyses demonstrated that faster (>18 mEq/L) 48-hour correction reduced risk of the primary outcome and 90-day death. Exploratory modeling indicated lowest predicted risk at 24-hour correction rates around 20 mEq/L, with hospital-level trends between 15–20 mEq/L. Overall, these findings suggest that faster sodium correction may be protective in severe hyponatremia.

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