Year: 2008
Type: article
Abstract: 3rd International Symposium on Fluorescein AngiographyThe 3rd international symposium on fluorescein angiography was held in Ghent from March 28 to April 1, 1976, under the presidency of Prof. J. F rançois and was attended by 400 ophthalmologists from 35 different countries.The first session was devoted to instrumentation and techniques.In the previous symposium in Tokyo, preliminary reports were given on wide-angle cameras cover ing up to 100° of the fundus.These cameras are now commercially available and at this meeting clinical experiences were presented by A llen and Pomerantzeff.How ever, it seems that the gain of field which is of great value for a panoramic viewing of the fundus results in a loss of detail.The use of image intensifiers has improved the quality of TV fluoroangiography (Feman) and the computerized elaboration of data obtained by TV angiography will allow a more precise analysis of haemo dynamic changes.Riva described a new method for direct measurements of retinal blood flow based on the Doppler effect.Delori obtained with modified filters a better visualization of the choroid, but even with these filters, fluorescein is certainly not the ideal dye to study the choroid.Indeed, not only is there absorption by the pigment epithelium but also a rapid diffusion out of the choriocapillaris.Indocyanin green, on the other hand, does not tend to leak out of the choroidal vessels.F lower has discovered the fluorescent properties of indocyanin green in the near infrared region and has developed a clinically acceptable method.The main indications are the study of choroidal vascular dynamics and perhaps the diagnosis and follow-up of choroidal tumors (Patz).Three sessions were devoted to retinal diseases.In the first, special emphasis was put on retinal vein occlusions.The pathophysiology was explained by Kohner.Laatikainen and Asayama stressed the importance of fluorescein angiography in assessing prognosis and Archer presented his classification of branch vein occlusion.During the discussion Hayreh presented a classification of central vein occlusion.Enough knowledge has been obtained on the natural history of this group of dis eases to allow good clinical trials for different methods of therapy.It might very well be that early light coagulation favourably influences the evolution of central vein occlusion (Oosterhuis and T heodossiades).Several papers described aspects of diabetic retinopathy.According to L ittle, the severity of the retinopathy is related to the degree of red cell aggregation.Im paired carbohydrate metabolism with hyperglycaemia may stimulate the release of growth hormone which influences the synthesis of fibrinogen and eu-globulin.These large proteins bind red cells into aggregates, which impair the microcirculation, causing ischaemia.However, this is certainly not the only cause (Kohner).On the one hand, acromegalics do not get diabetic retinopathy and on the other hand, patients who underwent pituitary ablation for their diabetic retinopathy still have increased fibrinogen levels.
Source: Blood Vessels
DOI: 10.1159/000158101
Language: French
Open Access status: bronze
OpenAlex ID: W4232055468