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Investigative Ophthalmology & Visual Science, Vol 37, 2228-2233, Copyright © 1996 by Association for Research in Vision and Ophthalmology

ARTICLES AND REPORTS

Visualization of leukocyte dynamics in the choroid with indocyanine green

N Matsuda, Y Ogura, H Nishiwaki, K Miyamoto, T Matsubara, J Kiryu and Y Honda
Department of Ophthalmology and Visual Sciences, Graduate School of Medicine, Kyoto University, Japan.

PURPOSE: To report a method to evaluate leukocyte dynamics in the choroidal circulation with indocyanine green (ICG) angiography. METHODS: Nonpigmented and pigmented rats were administered ICG solution intravenously. The fundus image was obtained with a scanning laser ophthalmoscope and recorded on magnetic tapes at a video rate (30 frames/second). The images were analyzed with a personal computer-based image analysis system. RESULTS: On ICG angiography, hyperfluorescent dots were seen moving along the choroidal vessels and in the retinal vessels several minutes after injection. These fluorescent dots were thought to be circulating leukocytes stained with ICG. The micrographs of blood smears after ICG injection showed intense fluorescence of leukocytes. Computer-assisted image analysis allowed tracing of these fluorescent dots using a frame-by frame method. CONCLUSIONS: Results of this study indicated that ICG can be used for vital staining of leukocytes and that it is possible to evaluate leukocyte movement in the choroidal circulation in vivo in rats.


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