Aortic reservoir characteristics and brain structure in people with type 2 diabetes mellitus; a cross sectional study
Methods: In a sample of people with T2DM and healthy controls, resting and exercise measures of aortic reservoir characteristics (including excess pressure integral [Pexcess]) and other central hemodynamics (including augmentation index [AIx] and aortic pulse wave velocity [aPWV]) were recorded. Brain volumes (including gray matter volume [GMV] and white matter lesions [WML]) were derived from magnetic resonance imaging (MRI) scans. Multivariable linear regression was used to study the associations of hemodynamic variables with brain structure in the two groups adjusting for age, sex, daytime systolic BP (SBP) and heart rate.ResultsThere were 37 T2DM (63¿±¿9 years; 47% male) and 37 healthy individuals (52¿±¿8 years; 51% male). In T2DM, resting aPWV was inversely associated with GMV (standardized ß¿=¿¿0.47, p¿=¿0.036). In healthy participants, resting Pexcess was inversely associated with GMV (ß¿=¿¿0.23, p¿=¿0.043) and AIx was associated with WML volume (ß¿=¿0.52, p¿=¿0.021). There were no associations between exercise hemodynamics and brain volumes in either group.
Conclusions: Brain atrophy is associated with resting aortic stiffness in T2DM, and resting Pexcess in healthy individuals. Central vascular mechanisms underlying structural brain changes may differ between healthy individuals and T2DM.
Publication titleCardiovascular Diabetology
Department/SchoolMenzies Institute for Medical Research
PublisherBioMed Central Ltd.
Place of publicationUnited Kingdom
Rights statementCopyright 2014 Climie et al-This is an Open Access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0).(http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.