Document Detail


Basal blood flow and autoregulation changes in the optic nerve of rhesus monkeys with idiopathic bilateral optic atrophy.
MedLine Citation:
PMID:  23287792     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: To characterize the hemodynamic features and the association with structural damage in the optic nerve head (ONH) of idiopathic bilateral optic atrophy (BOA) in rhesus macaque monkeys.
METHODS: In five animals with BOA and nine healthy animals under general anesthesia (pentobarbital), intraocular pressure (IOP) was manometrically controlled. ONH blood flow was measured with a laser speckle flow graph device. Basal blood flow in global and quadrantal sectors was measured with IOP set at 10 mm Hg; autoregulation capacity was assessed by comparing blood flow changes before and after IOP was increased from 10 to 30 mm Hg. Spectral-domain optic coherence tomography was used to measure retinal nerve fiber layer thickness (RNFLT) by peripapillary circular scans.
RESULTS: Compared with control eyes, RNFLT in BOA eyes was significantly less in all sectors (P < 0.001) except the nasal (P = 0.25); the average global and sectoral blood flow in all quadrants was significantly lower (P < 0.001). These blood flow changes were significantly correlated with corresponding sectoral RNFLT (P < 0.01) except the nasal (P = 0.25). After IOP was increased to 30 mm Hg, global blood flow was significantly reduced (P < 0.001), but with no regional preferences despite prominent temporal RNFLT loss; no significant blood flow change was observed in control eyes (P = 0.24).
CONCLUSIONS: Basal blood flow and autoregulation capacity in the ONH of BOA were significantly compromised, with a close correlation to structural changes. The hemodynamic changes showed no regional preference across the ONH, which was consistent with postmortem histological observations.
Authors:
Chelsea Piper; Brad Fortune; Grant Cull; George A Cioffi; Lin Wang
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2013-01-23
Journal Detail:
Title:  Investigative ophthalmology & visual science     Volume:  54     ISSN:  1552-5783     ISO Abbreviation:  Invest. Ophthalmol. Vis. Sci.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-01-24     Completed Date:  2013-03-19     Revised Date:  2013-08-08    
Medline Journal Info:
Nlm Unique ID:  7703701     Medline TA:  Invest Ophthalmol Vis Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  714-21     Citation Subset:  IM    
Affiliation:
Devers Eye Institute, Legacy Research Institute, Portland, Oregon.
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MeSH Terms
Descriptor/Qualifier:
Animals
Blood Flow Velocity / physiology*
Disease Models, Animal
Female
Homeostasis*
Laser-Doppler Flowmetry
Macaca mulatta
Male
Nerve Fibers / pathology*
Optic Atrophy / pathology,  physiopathology*
Optic Disk / blood supply*
Regional Blood Flow*
Tomography, Optical Coherence
Grant Support
ID/Acronym/Agency:
R01 EY019939/EY/NEI NIH HHS; R01-019939//PHS HHS; R01-EY019327/EY/NEI NIH HHS
Comments/Corrections

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