Hyperkalemia unresponsive to massive doses of aldosterone in a patient with renal tubular acidosis.

: In a 53-year-old male patient aldosterone-refractory hyperkalemia was associated with renal tubular acidosis (RTA) due to chronic interstitial nephritis accompanied by peritubular hyaline deposits in the distal nephron. The hyperkalemia was not caused by an adrenal disorder or acidosis and could not be abolished by diuretics, cortisone, longacting synthetic ACTH, excessive doses of DOCA and aldosterone. The results of our experimental studies carried out on the hyperkalemic RTA patient as well as on various control subjects and patients suggested the presence of a specific defect in renal K excretion associated with a decreased aldosterone responsiveness of the renal tubules presumably due to the peritubular pathology.