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More adverse renal prognosis of autosomal dominant polycystic kidney disease in families with primary hypertension.

Marked variability of age at renal death is noted in autosomal dominant polycystic kidney disease (ADPKD). The hypothesis that the coexistence of primary hypertension and ADPKD within families is associated with earlier renal death was tested. Of a total of 162 ADPKD patients treated in one Austrian and three German centers, 57 propositi were identified whose families provided (1) information concerning blood pressure; (2) documented presence of ADPKD (by sonography or autopsy) in one parent; and (3) age at renal death in the propositus. Hypertension of the unaffected parent was defined as blood pressure above 140/90 mm Hg or antihypertensive treatment before age 60 yr. Age at renal death in the propositus was defined as the start of renal replacement therapy. Median age at renal death of 23 offspring (11 male, 12 female) from families with a history of primary hypertension of the nonaffected parent was lower than that of 34 offspring (16 male, 18 female) from families without a known history of primary hypertension of the nonaffected parent, i.e., 49 yr (26 to 64) versus 54 yr (28 to 82) (P < 0.03). The data are consistent with the notion that genetic predisposition to primary hypertension is associated with an earlier onset of terminal renal failure in families with ADPKD.