Journal of the American Society of Nephrology, Vol 5, 2037-2047, Copyright © 1995 by American Society of Nephrology

REGULAR ARTICLES

Dietary protein restriction, blood pressure control, and the progression of polycystic kidney disease. Modification of Diet in Renal Disease Study Group [published erratum appears in J Am Soc Nephrol 1995 Oct;6(4):1318]

S Klahr, JA Breyer, GJ Beck, VW Dennis, JA Hartman, D Roth, TI Steinman, SR Wang and ME Yamamoto
National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA.

In the Modification of Diet in Renal Disease Study, a follow-up (mean, 2.2 yr) of 200 study participants with autosomal dominant polycystic kidney disease (ADPKD) was conducted to determine the effect of lowering protein intake and blood pressure on the rate of decline in GFR. The rate of decline was faster in participants with ADPKD than in persons with other diagnoses, reflecting, in part, faster disease progression in the ADPKD group. Baseline characteristics that predicted a faster rate of decline in GFR in persons with ADPKD were greater serum creatinine (independent of GFR), greater urinary protein excretion, higher mean arterial pressure (MAP), and younger age. In patients with initial GFR values between 25 and 55 mL/min per 1.73 m2, neither assignment to a low-protein diet group nor assignment to a low blood pressure group significantly reduced the rate of decline of GFR in ADPKD participants. Similarly, the decline in GFR was not related to achieved protein intake or MAP. In participants with GFR values between 13 and 24 mL/min per 1.73 m2, assignment to the low MAP group led to a somewhat more rapid decline in GFR. However, the more rapid decline in GFR did not appear to be due to a detrimental effect of low blood pressure or the antihypertensive agents used to reach the low blood pressure goal. Lower protein intake, but not prescription of the keto acid-amino acid supplement, was marginally associated with a slower progression of renal disease.

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