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Retinal and choroidal vessel closure using phthalocyanine photodynamic therapy
G H Kliman1, C A Puliafito, G A Grossman
1Department of Ophthalmology, Tufts University School of Medicine, Boston, Massachusetts 02111.
Lasers in Surgery and Medicine
|January 1, 1994
Summary
Chloro-aluminum sulfonated phthalocyanine (CASPc) effectively closes retinal and choroidal vessels in rabbits via photochemistry. This photoactive dye demonstrated vessel closure with minimal damage to surrounding eye tissues.
Area of Science:
- Ophthalmology
- Photochemistry
- Vascular Biology
Background:
- Photoactive dyes offer targeted therapeutic potential.
- Understanding vascular closure mechanisms is crucial for retinal diseases.
Purpose of the Study:
- To evaluate the efficacy of Chloro-aluminum sulfonated phthalocyanine (CASPc) in inducing photochemical closure of retinal and choroidal vessels.
- To assess the safety profile of CASPc treatment on surrounding ocular tissues.
Main Methods:
- CASPc was administered to normal rabbits.
- Specific vessels were irradiated with 675 nm light post-injection.
- Photographic, angiographic, and histopathologic analyses were performed.
Main Results:
- Irradiation before CASPc injection caused no ocular lesions.
- Post-injection irradiation led to complete closure of medullary ray and choroidal vessels in all subjects.
- Histopathology revealed thrombosis in targeted vessels with minimal adjacent tissue damage.
Conclusions:
- CASPc is a potent agent for achieving photochemical closure of retinal and choroidal vessels.
- The treatment demonstrates a favorable safety margin, sparing critical ocular structures like the neurosensory retina.
