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A simultaneous iris angiography technique in pigmented rabbits.

Xiao-Xu Zhou¹, Ai-Hua Liu, Song Lin

¹Tianjin Medical University Eye Center, Tianjin, China.

Ophthalmic Research

|October 15, 2011

Summary

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This study introduces a simultaneous iris angiography technique using indocyanine green (ICG) and fluorescein sodium (FS) in rabbits. A moderate dose of 5 mg each dye provides the best visualization of iris vasculature.

Area of Science:

Ophthalmology
Medical Imaging
Veterinary Science

Background:

Iris angiography (IA) is crucial for diagnosing various ocular conditions.
Evaluating IA techniques in animal models aids in understanding human ocular physiology and disease.
Pigmented rabbit eyes present unique challenges for imaging due to stromal pigmentation.

Purpose of the Study:

To develop and evaluate a simultaneous iris angiography (IA) technique using indocyanine green (ICG) and fluorescein sodium (FS) in pigmented rabbits.
To compare the effects of different dye dosages on the quality and duration of iris vasculature imaging.
To establish an optimal imaging protocol for high-quality IA in pigmented rabbit eyes.

Main Methods:

Fifteen pigmented rabbits were divided into three groups based on dye dosage: 2 mg, 5 mg, or 8 mg of both FS and ICG.

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Simultaneous IA was performed using a confocal scanning laser ophthalmoscope with a rapid localization technique.

Dynamic video imaging of iris vasculature was captured and analyzed for image quality, duration, and dye leakage.

Main Results:

Simultaneous digital angiography successfully visualized dynamic iris vasculature in all rabbits, unaffected by iris stromal pigment.
Lower dye doses (2 mg) provided rapid imaging but with short duration.
Higher dye doses (8 mg) resulted in prolonged imaging but significant dye leakage and iris edema.
Moderate dye doses (5 mg) offered clear ICG visualization for 300 seconds and FS visualization for 15-20 seconds, with minimal leakage.

Conclusions:

Simultaneous IA with a rapid localization technique is effective for high-quality imaging of pigmented rabbit irises.
A moderate dosage of 5 mg FS and 5 mg ICG is recommended for optimal visualization of iris vasculature.
This technique provides a valuable tool for research involving ocular vasculature in animal models.