Abstract

SO.09.05

Influence of cataract surgery on retinal vessel reaction

Eva Ernst, Jens Dawczynski, Jürgen Strobel
Klinik für Augenheilkunde, Universitätsklinikum Jena, Jena

Objective
Object of this work was the analyses of a possible influence of cataract surgery on the arterial and venous retinal vessel reaction. The vessel reaction was determined with statical and dynamic tests using the Retinal Vessel Analyzer (DVA).
Methods
For any of the patients (63 in total / average age 81±8.1) one eye was tested. These tests contain measuring of an arterial and venous vessel section via DVA one day before surgery and one day after it. Along a static evaluation a dynamic evaluation via flicker test has been run that included a 50 sec baseline measurement and 3 periods flicker stimulation, 20 sec each followed by 80 sec observation and continiously recording of the vascular metrics.
Results
The Evaluation of the test data for the static vessel reaction could not show any significant changes of the arterial vessel diameter (pre 122.15 RU, post 124.71 RU, p=0.47; RU-relative units). The venous vessel diameters are significantly larger after surgery than before (pre 144.38 RU, post 153.67 RU, p=0.001). The arteriovenous ratio had an average of 0.86 before surgery and 0.83 after surgery what turns out as an significant difference (p=0.02). The dynamic vessel reaction after flicker stimulation indicates for the arterial and venous dilatation no significant differences of of pre and post surgery metrics (arterial: pre 1.86 RU, post 1.02 RU, p=0.052; venous: pre 3.51 RU, post 2.71 RU, p=0.071).) If the group of patients is divided according to eaches type of anesthesia the subgroup that had a parabulbar anesthesia showed a significant decrease of arterial dilatation (p=0.035) that in the subgroup with intubation anesthesia is not present.
Conclusions
One approach for further studies is to test if changes of the arterial dilatation also occurs on patients who have had drop anesthesia. Also the effect of the parabulbar anesthesia on the arterial vessel dilatation should be investigated over a longer period of time to state if this is a permanent or a temporary phenomena. The increase of the venous base vessel diameter after cataract surgery is also a worthy subject for studies with larger patient group.

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