Association of home blood pressure variability with progression of chronic kidney disease.

OBJECTIVE: Home blood pressure (HBP) has been found to be a predictor of the progression of chronic kidney disease (CKD). The objective of this study is to clarify the clinical significance of day-by-day HBP variability on the progression of CKD.

METHODS: We recruited 135 patients with stage 3-5 CKD, who performed daily HBP measurements, every morning and evening over 7 consecutive days and recorded every 6 months, with a follow-up of 36 months. We examined the associations between the variables of blood pressure (BP) variability [SD, coefficient of variation (CV), average real variability (ARV)], and renal outcomes.

RESULTS: No significant correlations were found between the SD values, the CV values, the ARV values of each BP measurement, and the change in estimated glomerular filtration rate on multivariate regression analysis (β of SD, CV, and ARV of morning systolic BP: 0.04, 0.04, and 0.02; P=0.69, 0.63, and 0.20, respectively). None of these variables of each BP measurement showed a significant risk of renal events on multivariate Cox proportional hazards analysis (hazard ratios of SD, CV, and ARV of morning systolic BP: 0.99 (95% confidence intervals: 0.80-1.23), 0.97 (0.72-1.31), and 1.01 (0.83-1.24); P=0.94, 0.86, and 0.92, respectively).

CONCLUSION: Day-by-day BP variability as assessed by HBP measurements had no significant association with the progression of CKD.