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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Coexistence of central diabetes insipidus and salt wasting: the difficulties in diagnosis, changes in natremia, and treatment.

Both central diabetes insipidus (DI) and a high rate of excretion of sodium (Na) and chloride (Cl) contributed to the development of polyuria and dysnatremia in two patients during the acute postoperative period after neurosurgery. To minimize difficulties in diagnosis and projections for therapy, two available (but not often used) clinical tools were helpful. First, the osmole excretion rate early on revealed the co-existence of central DI and an osmotic diuresis. The osmoles excreted were largely Na salts; after antidiuretic hormone acted, this electrolyte diuresis caused the urine flow rate to be much higher than otherwise anticipated. Interestingly, part of this saline diuresis occurred when the extracellular fluid volume was contracted. The tool to explain the basis for the dysnatremias was a tonicity balance. Hypernatremia, which developed before treatment of central DI, was primarily a result of a positive balance for Na rather than a large negative balance for water. Moreover, hyponatremia that developed once antidiuretic hormone acted was primarily a result of a negative balance for Na; the urine volume was large and its Na concentration was hypertonic. To prevent a further decline in the plasma Na concentration, either the Na concentration in the urine should be decreased by provision of urea or a loop diuretic while replacing all unwanted water and electrolyte losses; alternatively, the fluid infused should have a similar Na concentration and volume as the urine (infuse hypertonic saline).[1]


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