Saturation Effects of Plasma Homocysteine on Chronic Kidney Disease in Chinese Adults With H-type Hypertension: A Cross-sectional Study.

Objective: Data on the association between homocysteine (Hcy) and the risk of chronic kidney disease (CKD) in patients with H-type hypertension were limited. This study aimed to examine the relation of Hcy with the prevalence of CKD and estimated glomerular filtration rate (eGFR) among Chinese adults with H-type hypertension.
Methods: A total of 12,873 Chinese adults with H-type hypertension aged 27-75 years were enrolled in the final analysis. Hcy concentrations were divided into 11 groups at 2 μmol/L interval. The outcome was CKD, defined as eGFR <60 mL/min/1.73 m ² .
Results: The prevalence of CKD was 7.58%, and the mean Hcy was 17.58 ± 10.96 μmol/L. The smoothing curve indicated that with the increase of Hcy, the prevalence of CKD increases first and then flattens, eGFR decreases first and then flattens, which supports the L-shaped association of Hcy with the prevalence of CKD and eGFR. Moreover, we further found the inflection point of Hcy was 22 μmol/L. OR (95% CI) of risk of CKD was 1.31 (1.28, 1.35) on the left side of an inflection point and 1.00 (0.99, 1.01) on the right of an inflection point, β (95% CI) of eGFR was -1.58 (-1.65, -1.50) on the left side of an inflection point and 0.00 (-0.03, 0.03) on the right of an inflection point, respectively. Similar results were found in various subgroups.
Conclusions: Our study suggested saturation effects of Hcy on the prevalence of CKD and eGFR among Chinese patients with H-type hypertension.
(Copyright © 2020 National Kidney Foundation, Inc. Published by Elsevier Inc. All rights reserved.)