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J Neuroimaging. 2015 Nov-Dec;25(6):900-5. doi: 10.1111/jon.12288. Epub 2015 Aug 29.

Water Exchange across the Blood-Brain Barrier in Obstructive Sleep Apnea: An MRI Diffusion-Weighted Pseudo-Continuous Arterial Spin Labeling Study.

Author information

1
Department of Anesthesiology, University of California, Los Angeles, Los Angeles, CA.
2
Department of Neurology, University of California, Los Angeles, Los Angeles, CA.
3
Department of Radiological Sciences, University of California, Los Angeles, Los Angeles, CA.
4
UCLA School of Nursing, University of California, Los Angeles, Los Angeles, CA.
5
Department of Medicine, University of California, Los Angeles, Los Angeles, CA.
6
Lawson Health Research Institute, London, ON, Canada.
7
Department of Neurobiology, University of California, Los Angeles, Los Angeles, CA.
8
Brain Research Institute, University of California, Los Angeles, Los Angeles, CA.
9
Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA.

Abstract

BACKGROUND AND PURPOSE:

Obstructive sleep apnea (OSA) subjects show brain injury in sites that control autonomic, cognitive, and mood functions that are deficient in the condition. The processes contributing to injury may include altered blood-brain barrier (BBB) actions. Our aim was to examine BBB function, based on diffusion-weighted pseudo-continuous arterial spin labeling (DW-pCASL) procedures, in OSA compared to controls.

METHODS:

We performed DW-pCASL imaging in nine OSA and nine controls on a 3.0-Tesla MRI scanner. Global mean gray and white matter arterial transient time (ATT, an index of large artery integrity), water exchange rate across the BBB (Kw, BBB function), DW-pCASL ratio, and cerebral blood flow (CBF) values were compared between OSA and control subjects.

RESULTS:

Global mean gray and white matter ATT (OSA vs. controls; gray matter, 1.691 ± .120 vs. 1.658 ± .109 second, P = .49; white matter, 1.700 ± .115 vs. 1.650 ± .114 second, P = .44), and CBF values (gray matter, 57.4 ± 15.8 vs. 58.2 ± 10.7 ml/100 g/min, P = .67; white matter, 24.2 ± 7.0 vs. 24.6 ± 6.7 ml/100 g/min, P = .91) did not differ significantly, but global gray and white matter Kw (gray matter, 158.0 ± 28.9 vs. 220.8 ± 40.6 min(-1) , P = .002; white matter, 177.5 ± 57.2 vs. 261.1 ± 51.0 min(-1) , P = .006), and DW-pCASL ratio (gray matter, .727 ± .076 vs. .823 ± .069, P = .011; white matter, .722 ± .144 vs. .888 ± .100, P = .004) values were significantly reduced in OSA over controls.

CONCLUSIONS:

OSA subjects show compromised BBB function, but intact large artery integrity. The BBB alterations may introduce neural damage contributing to abnormal functions in OSA, and suggest a need to repair BBB function with strategies commonly used in other fields.

KEYWORDS:

Magnetic resonance imaging; arterial transient time; autonomic control; pseudo-continuous arterial spin labeling

PMID:
26333175
PMCID:
PMC4562408
DOI:
10.1111/jon.12288
[Indexed for MEDLINE]
Free PMC Article

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