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Measurement of Oxygen Saturation in Retinal Vessels of Diabetics Before and After Laser Coagulation
1Eckler W., 1Königsdörffer E., 2Schweitzer D., 2Hammer M., 1Voigt U., 1Kraft J., 1Strobel J.,
1Friedrich-Schiller-Universität Jena, Klinik für Augenheilkunde (Jena)
2Friedrich-Schiller-Universität Jena, Klinik für Augenheilkunde, Experimentelle Ophthalmologie (Jena)
Purpose: The goal of the investigation is to show, how the damaged microcirculation in diabetic retinopathy changes the oxygen saturation. Another question is the influence of lasercoagulation on oxygen saturation.
Method: Oxygen saturation in retinal vessels can be measured by imaging ophthalmo- spectrometry. At 40 measurements at 16 diabetics type I or II with proliferative or severe stage of nonproliferative diabetic retinopathy have been performed at different points of ocular fundus before laser treatment and again after more than 2 weeks. The panretinal coagulation was started with 230-560 effects.
Results: Measurements showed significant differences (p=0,01) between venous oxygen saturation in diabetic retinopathy (63.3±7.4%) and normals (n=139, mean value: 57.9±9.9%) Another result was the significant (p=0,003) increase of the venous oxygen saturation after laser coagulation from 63.3±7.5% to 64.2±8.2%. The arterious oxygen saturation decreased not significantly from 93.4±4.0% to 91.1±5.3%.
Conclusions: The increase of venous oxygen saturation in comparison with those of normals could be explained by the change of the disturbed permeabilation of the vessel wall in diabetic retinopathy The increased venous oxygen saturation after laser coagulation might be an expression of a reduced demand of oxygen in retinal tissue.