Different glucose tolerance status and incident cardiovascular disease and all‐cause mortality among elderly Iranians
Geriatrics and Gerontology International
Published online on October 13, 2015
Abstract
Aims
To determine the effect of different glucose categories on incident cardiovascular disease (CVD) and all‐cause mortality in a population‐based cohort.
Methods
A total of 834 individuals aged 65 years and older without a history of CVD at baseline were stratified according to 2‐h post‐load glucose fasting glucose test into six categories including: (i) normal fasting glucose/normal glucose tolerance; (ii) prediabetes, (iii) isolated fasting hyperglycemia (IFH); (iv) isolated post‐challenge hyperglycemia (IPH); (v) IPH and IFH; and (vi) known diabetes mellitus. The prognostic significance of these groups on CVD and total mortality were examined by Cox proportional hazard ratios in a multivariate adjusted model.
Results
Over 9 years of follow up, 186 incidents of CVD and 218 deaths occurred (72 CVD mortality).Of the population, 45.2%, 30.7%, 1.2%, 6.1% 4.7%, and 11.9% were normal fasting glucose/normal glucose tolerance, prediabetes IFH, IPH, IFH and IPH, and known diabetes mellitus, respectively. Multivariate adjusted hazard ratios for CVD were 1.13 (95% CI 0.78–1.64), 1.03 (95% CI 0.25–4.22), 1.17 (95% CI 0.65–2.11), 2.52 (95% CI 1.43–4.42) and 2.39 (95% CI 1.55–3.69), and for CVD mortality were 0.59 (95% CI 0.27–1.30), 2.02 (95% CI 0.27–15.15), 1.26 (95% CI 0.51–3.16), 3.57 (95% CI 1.64–7.75), and 4.70 (95% CI 2.54–8.69) for prediabetes, IFH, IPH, IFH and IPH, and known diabetes mellitus phenotypes, respectively. Corresponding hazard ratios for all‐cause mortality in multivariate model adjusted for prevalent CVD were 1.07 (95% CI 0.73–1.57), 0.59 (95% CI 0.08–4.30), 0.92 (95% CI 0.5–1.70), 2.31 (95% CI 1.33–4.01) and 3.88 (95% CI 2.70–5.55), respectively.
Conclusion
Among the elderly population with newly diagnosed diabetes, only the combined IFH and IPH phenotype, but not IFH or IPH alone, was a significant predictor of CVD and mortality events. Prediabetes was not associated with any risk. Geriatr Gerontol Int 2016; 16: 1263–1271.