Abstract
A 61 year old male patient was studied who manifested dehydration, azotemia, acidosis and hyperkalemia six weeks after exposure to methicillin. Thyroid and adrenal glucocorticoid and mineralocorticoid function were normal. The dehydration was found to be caused by a profound sodium-losing nephropathy; urinary sodium ranged from 78 to 101 meq/day during a salt restricted diet. A distal renal tubular acidosis and a quantitively impaired ability to excrete potassium were also found. These defects were relatively unresponsive to mineralocorticoid or prednisone therapy. A renal biopsy specimen showed an interstitial nephritis which selectively affected distal tubules and was thought to be secondary to methicillin. The data suggest functional impairment specific for the distal tubule, but with only a modest decrease in the glomerular filtration rate.
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