Document Detail


Chorioretinal venous anastomoses: effect of different laser methods and energy in human eyes without vein occlusion.
MedLine Citation:
PMID:  9541819     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: This study was performed to determine the laser energy required to rupture both Bruch's membrane and retinal veins reliably in order to create a venous chorioretinal anastomosis. METHODS: A histological examination was conducted of argon green and YAG laser applications to the retina made prior to enucleation in eight eyes with large intraocular melanomas. RESULTS: Argon laser application of 50 microns in size and 0.1 s duration to intervascular areas of the retina will reliably rupture Bruch's membrane at a power level of at least 1.5 W. If the argon laser spot is placed overlying a retinal vein, a power level of up to 2.5-3.0 W will rupture Bruch's membrane in 60%, with only 34% of the retinal veins showing evidence of rupture. The YAG laser with power levels of 3-4 mJ will reliably rupture the retinal vein in cases where it has not previously been ruptured by the argon laser. CONCLUSION: When attempting to create a chorioretinal venous anastomosis in an eye with a non-ischaemic central retinal vein occlusion, Bruch's membrane should be ruptured first by placing the argon laser application at the side of the retinal vein before an attempt to rupture the retinal vein itself is made in case haemorrhage from the ruptured vein obscures the view. A power level of at least 2.5 W should be used. If the argon laser is unsuccessful in rupturing the retinal vein, a YAG laser (3-4 mJ) is effective.
Authors:
I L McAllister; S Vijayasekaran; D Y Yu; I J Constable
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv für klinische und experimentelle Ophthalmologie     Volume:  236     ISSN:  0721-832X     ISO Abbreviation:  Graefes Arch. Clin. Exp. Ophthalmol.     Publication Date:  1998 Mar 
Date Detail:
Created Date:  1998-05-04     Completed Date:  1998-05-04     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  8205248     Medline TA:  Graefes Arch Clin Exp Ophthalmol     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  174-81     Citation Subset:  IM    
Affiliation:
Lions Eye Institute, Nedlands, Western Australia.
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Anastomosis, Surgical
Bruch Membrane / pathology,  surgery*
Choroid / blood supply*,  pathology
Eye Enucleation
Humans
Laser Therapy / methods*
Melanoma / complications
Middle Aged
Retinal Vein / pathology,  surgery*
Retinal Vein Occlusion / surgery*
Uveal Neoplasms / complications

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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