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Hyperbaric area index calculated from ABPM elucidates the condition of CKD patients: the CKD-JAC study

Satoshi Iimuro1, Enyu Imai, Tsuyoshi Watanabe

  • 1Clinical Research Support Center, The University of Tokyo Hospital, Tokyo, Japan, siitky@gmail.com.

Clinical and Experimental Nephrology
|April 1, 2014
PubMed

Insights

A new measure, hyperbaric area index (HBI), from ambulatory blood pressure monitoring (ABPM) shows promise. This index is a sensitive indicator of reduced kidney function in chronic kidney disease (CKD) patients.

Area of Science:

  • Nephrology
  • Cardiology
  • Hypertension Research

Background:

  • Chronic kidney disease (CKD) patients exhibit high rates of masked and persistent hypertension.
  • Ambulatory blood pressure monitoring (ABPM) is crucial for assessing blood pressure (BP) load.
  • A novel indicator, hyperbaric area index (HBI), was developed to quantify BP load.

Purpose of the Study:

  • To evaluate the characteristics of the hyperbaric area index (HBI).
  • To assess the relationship between HBI and kidney function in CKD patients.
  • To determine if HBI is a sensitive indicator of reduced kidney function.

Main Methods:

  • Analysis of baseline ABPM data from 1,075 CKD patients in the Chronic Kidney Disease Japan Cohort (CKD-JAC) study.
  • Calculation of systolic HBI using ABPM data.
  • Statistical analysis to determine the association between HBI and estimated glomerular filtration rate (eGFR), adjusting for covariates.

Main Results:

  • Mean systolic HBI differed significantly between sexes and was higher in winter than summer.
  • HBI increased with advancing CKD stage, showing a higher value per decrease in eGFR.
  • HBI was a significant independent predictor of reduced kidney function (p < 0.001).

Conclusions:

  • Hyperbaric area index (HBI) may serve as a novel and sensitive marker for kidney function decline in CKD.
  • HBI's association with reduced kidney function is independent of nocturnal blood pressure changes (NBPC).
  • This index offers a valuable tool for monitoring kidney health in hypertensive CKD patients.
Abstract

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