Abstract
Abstract. The antiviral agent foscarnet has long been used in our unit to treat cytomegalovirus (CMV) infections in renal transplant patients. The clinical effect has been convincing and, apart from changes in serum calcium levels, very few side effects have been noted. We have, however, observed a nephrotoxic reaction in a series of patients with initially good renal function who therefore received high doses of foscarnet. Transplant biopsies performed in five of those patients revealed degenerative changes in the tubular epithelial cells as well as tubular calcium deposits and an infiltration of the interstitium by mixed mononuclear and polymor-phonuclear leucocytes. Renal insufficiency was accompanied by high fever. After withdrawal of the drug, the temperature rapidly normalized, whereas serum creatinine continued to rise for about 3 days and then fell back towards previous levels. We conclude that transplant biopsies are of great value in distinguishing between a foscarnet nephrotoxic effect and CMV nephritis, various forms of rejection, and other causes of impaired renal function.
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