• Martin Windpessl, Christoph Schwarz, and Manfred Wallner.
• Fourth Department of Medicine, Section of Nephrology, Klinikum Wels-Grieskirchen, Grieskirchnerstraße 42, 4600, Wels, Austria. martin.windpessl@klinikum-wegr.at.
• Bmc Nephrol. 2017 Feb 7; 18 (1): 54.

BackgroundSymptomatic hyponatremia is considered a rare complication of oral bowel preparation for colonoscopy. The pathophysiology underlying this phenomenon has been widely regarded as a mere sequela of excessive arginine vasopressin (AVP) release.Case PresentationThis case describes a 61-year old woman who developed acute hyponatremic encephalopathy when preparing for elective outpatient lower endoscopy. She had had negligible oral solute intake for two days and ingested four liters of clear fluid within two hours. On admission, the patient was agitated and had slurred speech. Treatment with hypertonic saline lead to full recovery. A brisk aquaresis confirmed acute dilutional hyponatremia.ConclusionApart from elevated AVP-levels, the amount and speed of fluid intake and concomitant low-solute intake constitute important risk factors in the development of clinically relevant hyponatremias in patients undergoing colonoscopies. Understanding that the cause of sodium imbalance in this scenario is multifactorial and complex is pivotal to recognizing and ideally preventing this complication, for which we propose the term "bowel prep hyponatremia".

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