Does an adequate control of blood pressure protect the kidney in essential hypertension?

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We analyzed the clinical course of 120 patients who were diagnosed as having primary hypertension and subsequently given standard stepped-care therapy (diuretic, ß-blocker and vasodilator) for 9 years. At the end of the follow-up period, 21 patients (17.5%) had developed overt proteinuria. The initial study showed no difference in systolic blood pressure, age, sex, serum creatinine and its clearance, glucose, cholesterol and triglycerides between these patients and those who had not become proteinuric, but uric acid levels and diastolic blood pressure were higher (both P < 0.01). An adequate control of blood pressure was obtained and maintained in all patients, who had similar therapeutic needs. During the follow-up period, uric acid levels remained significantly elevated (P < 0.01) in the proteinuric patients, while changes in serum glucose, cholesterol and triglycerides were similar in all patients. These results indicate that long-term treatment of primary hypertensives does not fully protect kidney function and that initially elevated uric acid levels could be a predictor of a poor prognosis

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