Differential diagnosis of hypertonic sodium gain causing hypernatremia
-nephrogenic diabetic insipidus due to demeclocycline, lithium, interstitial nephritis, prolonged urinary tract infection, hypokalemia, congenital hypercalcemia
-central diabetes insipidus due to head trauma, idiopathic, CNS mass
- primary hyperaldosteronism (hypernatremia usually mild and asymptomatic
-hypertonic intravenous fluids, enemas, tube feeds,
-salt intoxication ( rare)
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