Abstract:
:1. Studies on eight patients were performed to clarify the mechanism(s) of altered sodium metabolism and volume regulation in SIADH. The mechanism controlling water excretion was also studied to determine whether there is evidence that altered osmoregulation may be the basis for inappropriate ADH secretion in some patients. 2. These studies show that cumulative sodium balance and aldosterone secretion rates in patients with SIADH are negatively correlated with water intake. There is also a negative correlation between aldosterone secretion and urinary sodium excretion. In the absence of normal urine diluting ability, this increased excretion of sodium becomes a mechanism that allows an increased quantity of water to be excreted despite the persistence of an ADH effect on the renal tubules. 3. Within the range of hyponatremia observed in our studies, changes in serum sodium concentration were accounted for by changes in solute and water balance. One patient, who was potassium deficient during the studies, retained large quantities of sodium and potassium that could not be accounted for by an increase in either serum osmolality or body weight. These observations suggest that intracellular osmotically active solute is either lost or "inactivated" in some manner as intracellular potassium is replenished. 4. Marked impairment of urine diluting ability was demonstrated in all patients. However, two patients with SIADH associated with pulmonary tuberculosis exhibited graded responses to water loading, which suggests that ADH secretion may have been suppressed as serum osmolality was progressively reduced. Whether this can be attributed to a basic alteration or "re-setting" or osmoreceptor function, or is merely an indication that greater than normal reductions of serum osmolality are required to inhibit potent nonosmotic stimuli, remains to be determined.
journal_name
Medicine (Baltimore)journal_title
Medicineauthors
Cooke CR,Turin MD,Walker WGdoi
10.1097/00005792-197905000-00004subject
Has Abstractpub_date
1979-05-01 00:00:00pages
240-51issue
3eissn
0025-7974issn
1536-5964journal_volume
58pub_type
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