Objective: Treatment of symptomatic hyponatremia is not well established. European guidelines recommend bolus-wise administration of 150ml of 3% hypertonic saline. This recommendation is based, however, on low level of evidence. Design: Observational study Methods: Sixty-two consecutive hyponatremic patients admitted to the emergency department or intensive care unit of the University Hospital Wuerzburg were divided in subgroups according to treatment (150ml bolus of 3% hypertonic saline or conventional treatment), and symptom severity. Treatment target was defined as an increase in serum sodium by 5-10mEq/L within first 24h and maximum 8mEq/L during subsequent 24h. Results: 33/62 patients (53%) presented with moderate and 29/62 (47%) with severe symptoms. 36 were treated with hypertonic saline and 26 conventionally. In the hypertonic saline group serum sodium increased from 116±7 to 123±6 (24h) and 127±6mEq/L (48h) and from 121±6 to 126±5 and 129±4mEq/L in the conventional group, respectively. Overcorrection at 24h occurred more frequent in patients with severe than moderate symptoms (38% vs. 6%, p<0.05). Diuresis correlated positively with the degree of sodium overcorrection at 24h (r=0.6, p<0.01). Conventional therapies exposed patients to higher degrees of sodium fluctuations and an increased risk for insufficient sodium correction at 24h compared to hypertonic saline (RR 2.8, 95% CI 1.4-5.5). Conclusion: Sodium increase was more constant with hypertonic saline, but overcorrection rate was high, especially in severely symptomatic patients. Reducing bolus-volume and reevaluation before repeating bolus infusion might prevent overcorrection. Symptoms caused by exsiccosis can be misinterpreted as severely symptomatic hyponatremia and diuresis should be monitored.
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