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Atorvastatin Therapy is Associated with Greater and Faster Cerebral Hemodynamic Response

Authors
  • Xu, Guofan1, 2
  • Fitzgerald, Michele E.1, 2
  • Wen, Zhifei2
  • Fain, Sean B.2
  • Alsop, David C.3, 4
  • Carroll, Timothy5
  • Ries, Michele L.1, 2
  • Rowley, Howard A.2
  • Sager, Mark A.2
  • Asthana, Sanjay1, 2
  • Johnson, Sterling C.1, 2
  • Carlsson, Cynthia M.1, 2
  • 1 William S. Middleton VA Hospital, Madison, WI, USA , Madison (United States)
  • 2 University of Wisconsin, Madison, WI, USA , Madison (United States)
  • 3 Beth Israel Deaconess Medical Center, Boston, MA, USA , Boston (United States)
  • 4 Harvard Medical School, Boston, MA, USA , Boston (United States)
  • 5 Northwestern University, Chicago, IL, USA , Chicago (United States)
Type
Published Article
Journal
Brain Imaging and Behavior
Publisher
Springer-Verlag
Publication Date
Jan 23, 2008
Volume
2
Issue
2
Pages
94–104
Identifiers
DOI: 10.1007/s11682-007-9019-7
Source
Springer Nature
Keywords
License
Yellow

Abstract

Hypercholesterolemia in midlife increases the risk of subsequent cognitive decline, neurovascular disease, and Alzheimer’s disease (AD), and statin use is associated with reduced prevalence of these outcomes. While statins improve vasoreactivity in peripheral arteries and large cerebral arteries, little is known about the effects of statins on cerebral hemodynamic responses and cognition in healthy asymptomatic adults. At the final visit of a 4-month randomized, controlled, double-blind study comparing atorvastatin 40 mg daily to placebo, 16 asymptomatic middle-aged adults (15 had useable data) underwent blood oxygen level dependent (BOLD) functional magnetic resonance imaging (fMRI), arterial spin labeling (ASL) quantitative cerebral blood flow (qCBF), dynamic susceptibility contrast (DSC) and structural imaging of the brain. Using a memory recognition task requiring discrimination of previously viewed (PV) and novel (NV) human faces, fMRI was used to elicit activation from brain regions known to be vulnerable to changes associated with AD. The BOLD signal amplitude (PV > NV) and latency to each stimulus were tested on a voxel basis between the atorvastatin (n = 8) and placebo (n = 7) groups. Persons randomized to atorvastatin not only showed significantly greater BOLD amplitude in the right angular gyrus, left superior parietal lobule, right middle temporal and superior sulcus than the placebo group, but also decreased hemodynamic response latencies in the right middle frontal gyrus, left precentral gyrus, left cuneus and right posterior middle frontal gyrus. However, neither the resting cerebral blood flow (CBF) measured with ASL nor the mean transit time (MTT) of cerebral perfusion calculated from DSC showed differences in these regions in either group. The drug related BOLD differences during memory recognition suggest that atorvastatin may have improved cerebral small vessel vasoreactivity, possibly through an effect on endothelial function. Furthermore, these results suggest that the effect of atorvastatin on the task-induced BOLD signal may not be a simple consequence of baseline flow change.

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