Blood pressure, aortic stiffness, hemodynamics and cognition in twin pairs discordant for type 2 diabetes


Background: Type 2 diabetes (T2D) is associated with an increased risk of cognitive impairment and dementia with poorly understood underlying mechanisms. Objective: We examined the role of blood pressure (BP), aortic stiffness, and hemodynamics in this association. Methods: Cross-sectional sample of late middle-aged twins discordant for T2D from the Australian Twin Registry. Measurements included neuropsychological battery and brain MRI including arterial spin labelling (ASL) to measure cerebral perfusion. Mobil-o-Graph devices were used to non-invasively obtain 24-hour BP, aortic stiffness, and hemodynamic measures. Using mixed modelling, we studied associations of T2D with cognition, MRI measures, BP, aortic stiffness, and hemodynamics. Results: There were 23 twin pairs with mean age 63.7 (SD = 6.1) years. T2D (β=-0.45, p < 0.001) and age (β=-0.05, p = 0.022) were independently associated with poorer attention but not with memory or perceptual speed. T2D was associated with reduced nocturnal central systolic BP dipping (β=-3.79, p = 0.027), but not with BP, aortic stiffness, cerebral perfusion, or other hemodynamic measures. There was a statistically significant interaction between T2D and central systolic BP dipping in predicting attention scores (both p < 0.05 for the interaction term) whereby there was a positive association between BP dipping and attention scores in those with T2D, but not in those without T2D. Conclusion: We found an association between T2D and reduced nocturnal central systolic dipping, but not with any other measures of BP, stiffness or hemodynamic measures. Further study of the role of nocturnal central BP dipping in the association between T2D and cognitive impairment may help identify potential mechanisms.

Publication DOI:
Divisions: Life & Health Sciences > Psychology
Life & Health Sciences
Additional Information: Copyright ©2019 IOS Press. Journal of Alzheimer's Disease, vol. Pre-press, no. Pre-press, pp. 1-11, 2019
Uncontrolled Keywords: Blood pressure,cerebrovascular circulation,cognitive dysfunction,dementia,hemodynamics,type 2 diabetes mellitus,vascular stiffness,Neuroscience(all),Clinical Psychology,Geriatrics and Gerontology,Psychiatry and Mental health
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Related URLs: https://content ... sease/jad190319 (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2019-08-16
Published Online Date: 2019-08-16
Accepted Date: 2019-07-16
Authors: Karayiannis, C
Moran, C
Sharman, J E
Beare, R
Quinn, S J
Phan, T G
Wood, Amanda ( 0000-0002-1537-6858)
Thrift, A G
Wang, W C
Srikanth, V



Version: Accepted Version

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