Association of elevated glycosylated hemoglobin A1c with hyperfiltration in a middle-aged and elderly Chinese population with prediabetes or newly diagnosed diabetes: a cross-sectional study

BMC Endocr Disord. 2015 Sep 12;15:47. doi: 10.1186/s12902-015-0043-0.

Abstract

Background: To examine whether elevated glycosylated hemoglobin A1c (HbA1c) is associated with hyperfiltration in a middle-aged and elderly Chinese population.

Methods: Anthropometric and biochemical examinations were performed in 2491 individuals from the general population, aged 40-79 years, who participated in the Huaian Diabetes Prevention Program. The estimated glomerular filtration rate (eGFR) was calculated from creatinine levels using the CKD-EPI formula. Hyperfiltration was defined as eGFR >90(th) percentile.

Results: After adjustment [for age, gender, waistline, body mass index, blood pressure, smoking, alcohol consumption, cholesterol, log(triglycerides), high-density lipoprotein, low-density lipoprotein, serum uric acid, sodium intake, hypertension, and use of angiotensin converting enzyme inhibitors or angiotensin receptor blockers], HbA1c and fasting plasma glucose (FPG) were found to be independently positively associated with eGFR. Additionally, after multivariate adjustment, the odds ratios (95 % CI) for hyperfiltration calculated for a 1-unit increase in HbA1c and FPG were 1.396 (1.089-1.790) and 1.306 (1.117-1.526), respectively. Compared with participants with HbA1c levels <5.7%, the odds ratios (95 % CI) for hyperfiltration were 2.344 (1.025-5.364) in participants with HbA1c levels of 6.21-6.49%, and 2.965 (1.537-5.720) in those with HbA1c levels ≥ 6.5%.

Conclusion: Elevated HbA1c (≥ 6.21%) is associated with an increased odds of hyperfiltration in middle-aged and elderly Chinese. Longitudinal studies are needed to explore whether hyperfiltration increases the odds of diabetic nephropathy in individuals with prediabetes.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Blood Glucose / metabolism*
  • China
  • Creatinine / metabolism*
  • Cross-Sectional Studies
  • Diabetes Mellitus, Type 2 / metabolism*
  • Female
  • Glomerular Filtration Rate*
  • Glycated Hemoglobin A / metabolism*
  • Humans
  • Male
  • Middle Aged
  • Multivariate Analysis
  • Odds Ratio
  • Prediabetic State / metabolism*

Substances

  • Blood Glucose
  • Glycated Hemoglobin A
  • hemoglobin A1c protein, human
  • Creatinine