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Ophthalmo-dynamometric Assessment of the Central Retinal Artery and Vein Pressure in Eyes with Retinal Venous Stasis
Brambring D.,
Ruprecht-Karls-Universität Heidelberg, Fakultät für klinische Medizin Mannheim, Augenklinik (Mannheim)
Purpose: Using a new Goldmann lens associated ophthalmodynamometric device, it was the purpose of the present study was to determine the central retinal vessel collapse pressure as indirect measure of the blood pressure in the central retinal artery and vein in eyes with retinal venous stasis.
Methods: The prospective clinical study included 3 eyes with retinal venous stasis defined by marked dilatation and tortuosity of the retinal veins (age, 59.0 ± 19.6 years), and 14 normal eyes forming a control group (age, 69.4 ± 15.8years). With topical anesthesia, a Goldmann contact lens fitted with a pressure sensor was put onto the cornea. Pressure was asserted onto the globe by pressing the contact lens, and the pressure value at the time when the central retinal artery and vein started pulsating or showed stop of perfusion were noted. Additionally, we measured the brachial blood pressure.
Results: In the retinal stasis group, the diastolic collapse pressure of the central retinal artery measured 79.8 ± 10.3 mm Hg. It was not significantly (p=0.95) different from the value in the control group (80.9 ± 20.0 mm Hg). In the central retinal vein, diastolic collapse pressure measured in the retinal stasis group 52.9 ± 20.6 mm Hg. This value was significantly (p=0.005) higher than the value in the control group (11.8 ± 5.9 mm Hg).
Conclusions: As measured by a new ophthalmodynamometer with direct visualization of the central retinal vessels during the examination, the diastolic central retinal vein collapse pressure is in eyes with retinal venous stasis markedly higher than in normal eyes. In both study groups, the diastolic central retinal artery collapse pressure does not differ significantly.