Abstract
Subclinical cardiac dysfunction is associated with smaller total brain volume on magnetic resonance imaging (MRI). To study whether cardiac output relates to regional measurements of grey and white matter structure, older adults (n = 326) underwent echocardiogram to quantify cardiac output (L/min) and brain MRI. Linear regressions related cardiac output to grey matter volumes measured on T1 and white matter hyperintensities assessed on T2-FLAIR. Voxelwise analyses related cardiac output to diffusion tensor imaging adjusting for demographic, genetic, and vascular risk factors. Follow-up models assessed a cardiac output x diagnosis interaction with stratification (normal cognition, mild cognitive impairment). Cardiac output interacted with diagnosis, such that lower cardiac output related to smaller total grey matter (p = 0.01), frontal lobe (p = 0.01), and occipital lobe volumes (p = 0.01) among participants with normal cognition. When excluding participants with cardiovascular disease and atrial fibrillation, associations emerged with smaller parietal lobe (p = 0.005) and hippocampal volume (p = 0.05). Subtle age-related cardiac changes may disrupt neuronal homeostasis and impact grey matter integrity prior to cognitive impairment.
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Abbreviations
- AD:
-
Alzheimer’s disease
- APOE:
-
Apolipoprotein E
- CBF:
-
Cerebral blood flow
- CSF:
-
Cerebrospinal fluid
- CVD:
-
Cardiovascular disease
- DTI:
-
Diffusion tensor imaging
- eMCI:
-
Early mild cognitive impairment
- FLAIR:
-
Fluid attenuated inversion recovery
- FSL:
-
FMRIB Software Library
- FSRP:
-
Framingham Stroke Risk Profile
- LVH:
-
Left ventricular hypertrophy
- MCI:
-
Mild cognitive impairment
- MNI:
-
Montreal Neurological Institute
- MRI:
-
Magnetic resonance imaging
- NC:
-
Normal cognition
- ROI:
-
Region of interest
- VMAP:
-
Vanderbilt Memory & Aging Project
- WMH:
-
White matter hyperintensities
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Acknowledgments
The authors would like to thank the dedicated Vanderbilt Memory & Aging Project participants, their loved ones, and the devoted staff and trainees who contributed to recruitment, screening, and enrollment of the baseline cohort.
Funding
This research was supported by the Vanderbilt Alzheimer's Disease Research Center (P20-AG068082 [ALJ]), Alzheimer’s Association (IIRG-08-88733 [ALJ]), the National Institutes of Health (R01-AG034962 [ALJ], R01-AG056534 [ALJ], R01-NS100980 [ALJ], K24-AG046373 [ALJ], Paul B. Beeson Career Development Award in Aging K23-AG045966 [KAG], K01-AG049164 [TJH], K12-HL109019 [DKG], K23-HL128928 [DKG], F30-AG064847 [EEM], T32-GM007347 [EEM], F31-AG066358 (CWB), T32-AG058524 (CWB) UL1-TR000445, and S10-OD023680), and the Vanderbilt Memory & Alzheimer’s Center.
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Author contributions included conception and study design (EEM, ALJ, KAG, and TJH), data collection or acquisition (EEM, CWB, HAK, DKG, KRP, LAM, LTD, AWA, TJW, and BAL), statistical analysis (DL, TJH, and ALJ), interpretation of results (EEM, CWB, HAK, TJH, and ALJ), drafting the manuscript work or revising it critically for important intellectual content (EEM and ALJ) and approval of final version to be published and agreement to be accountable for the integrity and accuracy of all aspects of the work (All authors).
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Moore, E.E., Liu, D., Bown, C.W. et al. Lower cardiac output is associated with neurodegeneration among older adults with normal cognition but not mild cognitive impairment. Brain Imaging and Behavior 15, 2040–2050 (2021). https://doi.org/10.1007/s11682-020-00398-0
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DOI: https://doi.org/10.1007/s11682-020-00398-0