[Systolic blood pressure and progression of renal dysfunction in the elderly patients with moderate to severe chronic kidney disease: a cohort study from a tertiary hospital].

To study the effect of blood pressure (BP) control on the progression of renal function in elderly patients with chronic kidney disease ( CKD) stages 3 and 4.Patients aged 65 years or older in our CKD clinic with baseline CKD stages 3 and 4 and with more than one-year followup until February 2014 were included in this study. Those who had an annual loss of epidermal growth factor receptor (eGFR) for more than 5 ml x min(-1) x 1.73 m(-2), or...