PubMed · 5460621
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S P Gotoff, R E Behrman. 1970. Neonatal septicemia.. https://doi.org/10.1016/s0022-3476(70)80148-2
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Four cats with considerable peritoneal effusion and corresponding hyponatremia and hyperkalemia were evaluated. The Na:K ratio in all cats was < 25, which is suggestive of adrenal insufficiency. An ACTH stimulation test was performed on 3 cats for evaluation of adrenal gland function. Serum cortisol and aldosterone concentrations did not support a diagnosis of adrenal gland insufficiency. In 1 cat, histologic evaluation of the adrenal glands at necropsy also failed to support a diagnosis of hypoadrenocorticism. On the basis of these findings, and because hyponatremia and hyperkalemia could not be readily explained by another cause, the electrolyte abnormalities were presumed to be secondary to peritoneal effusion.
Differential diagnoses for hyponatremia with concurrent hyperkalemia should include hypoadrenocorticism. Renal failure, chylothorax, and gastrointestinal tract disorders may also cause abnormally low serum sodium:potassium ratios. The ACTH stimulation test is the gold standard for diagnosis of hypoadrenocorticism.
A 63-year-old man received high-dose cyclophosphamide for peripheral blood stem-cell (PBSC) harvest. He received 200 mg fluconazole. On day 3, atrial fibrillation developed with blood pressure declining to 78 mmHg. The rapid adrenocorticotropin (ACTH) test showed blunted adrenal responses. He was suspected as having adrenal failure, and fluconazole was discontinued. The rapid ACTH test became normal on Day 14, and PBSCs were successfully harvested. To clarify the association between adrenal failure and fluconazole, we resumed 400 mg fluconazole on Day 16 and repeated the test on Day 21, which showed blunted adrenal responses. This case demonstrates that prophylactic use of fluconazole can cause adrenal insufficiency.