The Relationship Between Blood Pressure Variability And Renal Progression In Hypertensive Patients With Chronic Kidney Disease

Abstract

Objective: To evaluate the effect of 24 hour systolic blood pressure (SBP) and diastolic blood pressure (DBP) variability (BPV) on renal progression in hypertensive patients with chronic kidney disease (CKD) Methods: A total 59 hypertensive patients (mean age: 54.2±14.6 years, 50.8% male) with CKD who underwent 24 hours ambulatory blood pressure measurement (ABPM) were included. Data on SBP, DBP, BPV coefficients (VC) for SBP (SBP-CV) and DBP (DBP-CV) were recorded. A decrease in e-GFR of <5 ml/min/year was considered as normal renal progression and a decrease in ≥5 ml/min/year was considered as rapid renal progression. Results: Overall, 40.6% of the patients had uncontrolled HT, while 45.8% had non-dipper pattern. Mean±SD daytime and night-time SBP and SBP-VC values were 135.3±17.9 mmHg, 128.6±23.0 mmHg, 11.7±2.8 and 9.5±3.6, respectively. Mean±SD daytime and nigh-time DBP and DBP-VC values were 84.5±13.4 mmHg, 77.2±16.1 mmHg, 13.8±3.8 and 12.0±3.7, respectively. Rapid renal progression was detected in 25.4% of patients with no significant difference in daytime, night-time and total SBP, SBP-VC, DBP and DBP-VC values between patients with rapid vs. natural renal progression. The regression analysis adjusted for age, gender, presence of DM, baseline e-GFR and dipping status revealed no significant impact of SBP-VC and DBP-VC in predicting rapid progression (p> 0.05). Conclusion: In conclusion, our finding revealed no significant association between BPV and renal progression in hypertensive patients with CKD. Larger scale prospective, randomized controlled trials with longer follow-up are needed to clarify this issue.