Echocardiographic Measures and Estimated GFR Decline Among African Americans: The Jackson Heart Study.

Background: Cardiac structural abnormalities, common in African Americans, are associated with adverse clinical outcomes. Associations between echocardiography-measured subclinical heart failure and kidney function decline are unknown and may identify novel risk factors for kidney disease in this population.
Study Design: Prospective cohort study.
Setting & Participants: 2,418 Jackson Heart Study participants with baseline echocardiograms and longitudinal measures of estimated glomerular filtration rate (eGFR) calculated from the CKD-EPI creatinine equation. 2,219 participants had baseline eGFRs≥60mL/min/1.73m ² .
Predictors: Left ventricular mass (LVM) and ejection fraction (LVEF) and pulmonary artery systolic pressure (PASP) quantified from baseline echocardiograms.
Outcomes: Primary outcome was >30% eGFR decline or progression to end-stage renal disease (ESRD; need for dialysis therapy) over a mean of 8 years. Secondary outcome, eGFR<60mL/min/1.73m ² or progression to ESRD and eGFR decline >1mL/min/1.73m ² per year among those with baseline eGFRs≥60mL/min/1.73m ² .
Measurements: Logistic regression models, adjusted for demographics, physical characteristics, comorbid conditions, and medication use.
Results: Mean age was 52.2±11.9 (SD) years, 37% of participants were men; mean baseline eGFR was 87.3±17.3mL/min/1.73m ² . The primary and secondary outcomes occurred in 148 (6.1%) and 162 (7.1%) participants, respectively. In unadjusted models, every 25-g greater LVM was significantly associated with greater odds of eGFR decline > 30% or ESRD (OR, 1.38; 95% CI, 1.26-1.51) and incident eGFR<60mL/min/1.73m ² or ESRD (OR, 1.30; 95% CI, 1.20-1.42); only the former remained statistically significant after adjustment. There was no association of LVEF or PASP with either eGFR decline > 30% or ESRD (LVEF: adjusted OR, 0.95 [95% CI, 0.84-1.07]; PASP: adjusted OR, 0.98 [95% CI, 0.87-1.11]) or incident eGFR<60mL/min/1.73m ² or ESRD (LVEF: adjusted OR, 0.98 [95% CI, 0.86-1.11]; PASP: adjusted OR, 1.05 [95% CI, 0.94-1.18]) in multivariable models.
Limitations: No midstudy creatinine measurement at examination 2.
Conclusions: Greater LVM was significantly associated with eGFR decline > 30% or ESRD among African Americans in a community-based cohort. Treating and reversing elevated LVM may reduce the burden and progression of kidney disease in this high-risk population.
(Copyright © 2017 National Kidney Foundation, Inc. Published by Elsevier Inc. All rights reserved.)