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Title variations Quantifying retinal vessels in multiple sclerosis
Subtitle for translated title Can it be useful examining pathologies of the venous system?
Author(s) Bilger, Frieder
Place of birth: Herrenberg
Introduction: Multiple sclerosis (MS) is a chronic inflammatory and degenerative disease of the central nervous system. Most accepted is an autoimmune and T-cell mediated etiology. However, since 2007 an Italian research team postulates a “Chronic Cerebrospinal Venous Insufficiency “ (CCSVI) as a main cause of MS and suggests angioplasty as a potential cure. The aim of this dissertation is to develop and to evaluate a method for semi-automatic quantification of retinal vessels on scanning laser ophthalmoscopic (SLO) pictures. By using this method the aim is to examine differences in retinal vessel caliber, especially a potential enlargement of retinal veins, between MS patients and healthy controls.
Methods: A new method for semi-automatic quantification of retinal vessels on SLO pictures has been developed. First, all vessels are manually categorized as arteries, veins or unknown vessels. Second, at defined measuring points an automatic algorithm using gray scale gradient determined the vessel caliber. Evaluation of this method showed very good conformance with established methods of quantifying vessels on fundoscopic photos as well as a very low dependency on investigators.
Results: Retinal pictures from 108 patients suffering from MS or clinically isolated syndrome have been compared with pictures from 96 healthy controls. There was no significant difference of vessel caliber between both groups. However, a significant correlation of vessel calibers and retinal nerve fiber layer thickness (RNFL) as well as total macular volume (TMV) has been identified.
Discussion: There was no sign of venous insufficiency in MS patients in this study. Therewith this study is in line with many other studies performed in reaction to the CCSVI thesis not showing any signs of MS specific venous insufficiency. The shown correlation of vessel calibers with RNFL and TMV needs to be considered as a disruptive factor measuring these parameters that could potentially enlarge or reduce existing effects