ACHIEVED SYSTOLIC BLOOD PRESSURE BELOW 130 MMHG PRESERVES KIDNEY FUNCTION IN DIABETIC AND NON-DIABETIC HYPERTENSIVE PATIENTS WITHOUT CARDIAC HYPERTROPHY

Abstract

Objective: Kidney function is preserved by achieving systolic blood pressure (SBP) primarily <140mmHg and possibly <130mmHg in hypertensive patients. We aimed to investigate kidney function when achieving SBP 130-139 and <130mmHg in type-2 diabetic and non-diabetic hypertensive patients without cardiac hypertrophy who participated in a major prospective hypertension outcome trial. Design and method: Of the 15,245 study participants, 13,803 patients were without cardiovascular events during the first six months after randomization with roll-over from previous medications to blinded study drugs and had a minimum of 3 subsequent BP visits during 4-6 years. Of these, 2,458 patients with cardiac left ventricular hypertrophy (LVH) by ECG were not included in the present analysis because, as previously reported, they had increased cardiac and all-cause mortality at average achieved SBP <130mmHg. Of the remaining 11,345 patients, 3932 had diabetes. Cox analyzes adjusted for baseline covariates compared the pre-specified kidney endpoints 50% rise of se-creatinine (worsening kidney function, WKF) and end-stage renal disease (ESRD, dialysis and/or transplantation) for patients who achieved average SBP 130-139 and <130mmHg with those who remained with SBP >=140mmHg. Results: Patients with diabetes had less WKF at SBP 130-139mmHg (HR=0.50, 95% CIs 0.34-0.72, n=1605, p<0.001) and at SBP <130mmHg (HR=0.43, CIs 0.23-0.80, n=599, p=0.008). They also had less ESRD at SBP 130-139mmHg (HR=0.32, CIs 0.12-0.88, p=0.03) with similar trend at SBP <130mmHg (HR=0.21, CIs 0.03-1.65) which was significant for the 3rd quartile of SBP (135mmHg) (HR=0.09, CIs 0.01-0.71, p=0.02) and for the 4th quartile of SBP (126mmHg) (HR=0.12, CIs 0.02-0.92, p=0.04). Patients without diabetes (n=7413) also had less WKF at SBP 130-139mmHg (HR=0.58, CIs 0.40-0.83, n=3258, p=0.003) and at SBP <130mmHg (HR=0.38, CIs 0.21-0.68, n=1542, p<0.001). For ESRD the trend was similar as for diabetes at 3rd quartile of SBP (135mmHg) (HR=0.37, CIs 0.14-1.00, p=0.05) and at 4th quartile of SBP (126mmHg) (HR=0.23, CIs 0.07-0.75, p=0.02). Conclusions: In high-risk hypertensive patients above 50 years, with and without type-2 diabetes, but without cardiac hypertrophy, we found stepwise less worsening of kidney function and end-stage renal disease with lower average achieved systolic BP from >=140mmHg to 130-139mmHg to <130mmHg.