Optimal conditions required for the creation of iatrogenic chorioretinal venous anastomosis in the dog using argon green laser photocoagulation

S. Vijayasekaran, Dao-Yi Yu, Ian Mcallister, C. Barry, Ian Constable

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

We have previously reported iatrogenic retinal to choroidal vein anastomosis, developed as a potential method of by-passing the site of obstruction to venous outflow in retinal venous occlusion in dogs (1), and in rats (2). In order to minimise tissue damage to the retina and choroid and increase the rate of success in these experiments, we investigated in the dog model the factors that would promote an anastomosis and compare the effects of three different power levels. A small spot size (50 mu m) argon green laser beam of 514 nm at power levels of 0.5w, 1.5w and 2.5w were used. Spaced serial sections from each lesion were examined by light and by transmission electron microscopy. Morphometric measurements of the corresponding retinal pigment epithelium (RPE)/glial scar was computed using IBMPC digitising pad and sigma scan software and the extent of tissue damage at the different power levels assessed. At the lowest power level of 0.5w the damage to the retina was mild and there was an absence of anastomosis formation. At the 1.5w power level an anastomosis formed in 40% of the lesions. At the highest power level of 2.5w a 71% rate of success was obtained however, the damage to the retina tended to the severe. The results of this study also indicate that disruption of Bruch's membrane and vein rupture at the time of irradiation are essential for anastomosis formation, which may be further enhanced by necrotic tissue, retinal pigment epithelial and glial scar formation and inflammation. These findings are useful in establishing optimal conditions for the creation of a chorioretinal venous anastomosis, for consideration in human trials.
Original languageEnglish
Pages (from-to)63-70
JournalCurrent Eye Research
Volume14
Issue number1
DOIs
Publication statusPublished - 1995

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Light Coagulation
Argon
Retina
Lasers
Dogs
Neuroglia
Cicatrix
Veins
Bruch Membrane
Retinal Pigments
Choroid
Retinal Pigment Epithelium
Transmission Electron Microscopy
Rupture
Software
Inflammation
Light

Cite this

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title = "Optimal conditions required for the creation of iatrogenic chorioretinal venous anastomosis in the dog using argon green laser photocoagulation",
abstract = "We have previously reported iatrogenic retinal to choroidal vein anastomosis, developed as a potential method of by-passing the site of obstruction to venous outflow in retinal venous occlusion in dogs (1), and in rats (2). In order to minimise tissue damage to the retina and choroid and increase the rate of success in these experiments, we investigated in the dog model the factors that would promote an anastomosis and compare the effects of three different power levels. A small spot size (50 mu m) argon green laser beam of 514 nm at power levels of 0.5w, 1.5w and 2.5w were used. Spaced serial sections from each lesion were examined by light and by transmission electron microscopy. Morphometric measurements of the corresponding retinal pigment epithelium (RPE)/glial scar was computed using IBMPC digitising pad and sigma scan software and the extent of tissue damage at the different power levels assessed. At the lowest power level of 0.5w the damage to the retina was mild and there was an absence of anastomosis formation. At the 1.5w power level an anastomosis formed in 40{\%} of the lesions. At the highest power level of 2.5w a 71{\%} rate of success was obtained however, the damage to the retina tended to the severe. The results of this study also indicate that disruption of Bruch's membrane and vein rupture at the time of irradiation are essential for anastomosis formation, which may be further enhanced by necrotic tissue, retinal pigment epithelial and glial scar formation and inflammation. These findings are useful in establishing optimal conditions for the creation of a chorioretinal venous anastomosis, for consideration in human trials.",
author = "S. Vijayasekaran and Dao-Yi Yu and Ian Mcallister and C. Barry and Ian Constable",
year = "1995",
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Optimal conditions required for the creation of iatrogenic chorioretinal venous anastomosis in the dog using argon green laser photocoagulation. / Vijayasekaran, S.; Yu, Dao-Yi; Mcallister, Ian; Barry, C.; Constable, Ian.

In: Current Eye Research, Vol. 14, No. 1, 1995, p. 63-70.

Research output: Contribution to journalArticle

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T1 - Optimal conditions required for the creation of iatrogenic chorioretinal venous anastomosis in the dog using argon green laser photocoagulation

AU - Vijayasekaran, S.

AU - Yu, Dao-Yi

AU - Mcallister, Ian

AU - Barry, C.

AU - Constable, Ian

PY - 1995

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AB - We have previously reported iatrogenic retinal to choroidal vein anastomosis, developed as a potential method of by-passing the site of obstruction to venous outflow in retinal venous occlusion in dogs (1), and in rats (2). In order to minimise tissue damage to the retina and choroid and increase the rate of success in these experiments, we investigated in the dog model the factors that would promote an anastomosis and compare the effects of three different power levels. A small spot size (50 mu m) argon green laser beam of 514 nm at power levels of 0.5w, 1.5w and 2.5w were used. Spaced serial sections from each lesion were examined by light and by transmission electron microscopy. Morphometric measurements of the corresponding retinal pigment epithelium (RPE)/glial scar was computed using IBMPC digitising pad and sigma scan software and the extent of tissue damage at the different power levels assessed. At the lowest power level of 0.5w the damage to the retina was mild and there was an absence of anastomosis formation. At the 1.5w power level an anastomosis formed in 40% of the lesions. At the highest power level of 2.5w a 71% rate of success was obtained however, the damage to the retina tended to the severe. The results of this study also indicate that disruption of Bruch's membrane and vein rupture at the time of irradiation are essential for anastomosis formation, which may be further enhanced by necrotic tissue, retinal pigment epithelial and glial scar formation and inflammation. These findings are useful in establishing optimal conditions for the creation of a chorioretinal venous anastomosis, for consideration in human trials.

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