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Hypertonic saline for hyponatremia: risk of inadvertent overcorrection Mohmand HK; Issa D; Ahmad Z; Cappuccio JD; Kouides RW; Sterns RHClin J Am Soc Nephrol 2007[Nov]; 2 (6): 1110-7BACKGROUND AND OBJECTIVES: Data regarding dosage-response relationships for using hypertonic saline in treatment of hyponatremia are extremely limited. Objectives of this study were to assess adherence to previously published guidelines (limiting correction to <12 mEq/L per d and <18 mEq/L per 48 h) in treating hyponatremia with hypertonic saline and to determine the predictive accuracy of the Adrogue-Madias formula. DESIGN, SETTING, PARTICIPANTS & MEASUREMENTS: A retrospective review was conducted of all 62 adult, hyponatremic patients who were treated with hypertonic saline during 5 yr at a 528-bed, acute care, teaching hospital. RESULTS: Median infusion rate was 0.38 ml/kg per h, increasing serum sodium concentration by 0.47 +/- 0.05 mEq/L per h, 7.1 +/- 0.6 mEq/L per 24 h, and 11.3 +/- 0.7 mEq/L per 48 h. In 11.3% of cases, the increase was >12 mEq/L per 24 h and in 9.7% was >18 mEq/L per 48 h. No patient's rate was corrected by >25 mEq/L per 48 h. Among patients with serum sodium <120 mEq/L, the observed increase in sodium exceeded the rise predicted by the Adrogue-Madias formula in 74.2%; the average correction in overcorrectors was 2.4 times the predicted. Inadvertent overcorrection was due to documented water diuresis in 40% of cases. CONCLUSIONS: The Adrogue-Madias formula underestimates increase in sodium concentration after hypertonic saline therapy. Unrecognized hypovolemia and other reversible causes of water retention pose a risk for inadvertent overcorrection. Hypertonic saline should be infused at rates lower than those predicted by formulas with close monitoring of serum sodium and urine output.|Aged[MESH]|Aged, 80 and over[MESH]|Female[MESH]|Humans[MESH]|Hyponatremia/*therapy[MESH]|Inappropriate ADH Syndrome/blood/complications[MESH]|Male[MESH]|Middle Aged[MESH]|Retrospective Studies[MESH]|Saline Solution, Hypertonic/*administration & dosage/adverse effects[MESH]|Sodium/blood[MESH] |
