کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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6197631 | 1261200 | 2009 | 7 صفحه PDF | دانلود رایگان |
The purpose of this study was to establish, and characterize a porcine model of acute, controlled retinal ischemia. The controlled retinal ischemia was produced by clamping the ocular perfusion pressure (OPP) in the left eye to 5Â mm Hg for 2Â h. The OPP was defined as mean arterial blood pressure (MAP) minus the intraocular pressure (IOP). It was clamped to 0-30Â mm Hg by continuous monitoring of MAP and adjustment of the IOP, which was controlled by cannulation of the anterior chamber. Inner retinal function was assessed by induced multifocal electroretinography (mfERG) with comparisons of the amplitudes obtained in the experimental, left eye, and the control, right eye. Quantitative histology was performed to measure the survival of ganglion cells, amacrine cells and horizontal cells 2-6 weeks after the ischemic insult. An OPP of 5Â mm Hg for 2Â h induced significant reductions in the amplitudes of iN1 to 20% (CI: 13-30%), and iP2 to 14% (95% CI: 8-22%) of their baseline values. No signs of recovery were found within the 6-week observation period. Quantitative histology revealed a highly significant reduction in the number of ganglion cells, amacrine cells and horizontal cells after the ischemic insult. This model seems to be suitable for investigations of therapeutic initiatives in diseases involving acute retinal ischemia.
Journal: Experimental Eye Research - Volume 88, Issue 6, 1 June 2009, Pages 1100-1106