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The contractile vacuole allows free-living protists to expel extra water. <b>The contractile vacuole allows free-living protists to expel extra water <br /></b>.
For normovolemic (euvolemic), asymptomatic hyponatremic patients, free water restriction (<1 L/d) is generally the treatment of choice. There is no role for hypertonic saline in these patients. Base the volume of restriction on the patient's renal diluting capacity.