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Beitragstitel Analysis of retinal vessel pulsations with electrocardiographic gating
Autor:innen
  1. Olivia Bollinger Universitätsspital Basel Präsentierende:r
  2. Yasemin Saruhan Augenklinik St. Gallen Präsentierende:r
  3. Konstantin Gugleta Universitätsspital Basel Präsentierende:r
Präsentationsform ePoster
Themengebiete
  • Glaucoma
Abstract-Text Background: Pulsations of retinal veins can sometimes be seen spontaneously in ophthalmoscopic examinations. The classical explanation to the origin of these pulsations has been that the cardiac cycle induces systolic peaks in the intraocular pressure (IOP) which leads retinal veins to collapse temporarily. However, the theoretical model of “Levine & Bebie” shows that retinal veins can collapse in IOP diastole, which implies the hypothesis that IOP is not the major driving force of retinal vein pulsations. The aim was to support this hypothesis in a clinical trial.

Methods: Continuous IOP and Retinal Vessel Analyser (RVA) measurements were taken from 21 subjects, age 20-30y with no known ophthalmologic diseases, while connected to a standard electrocardiograph (ECG). With this methodology, average curves for the pulse cycle of IOP and retinal vessel pulsations were calculated for each subject. The numerical data of 50 positions within the curve were used for correlation calculations to find the phase shift between the curves of IOP and the retinal vessels. In addition, polynomial fit was used to identify the real peak of the curves within these 50 positions.

Results: Out of the 21 IOP measurements 11 fulfilled the quality criteria to be used in the phase shift analysis. All subjects showed the same result. Retinal arteries lead with the first peak at the 16-19/50 pulse cycle position, followed by IOP peak at 23/50 cycle position, and then by veins at 26-32/50 cycle position. Comparing the two analysis methods, both showed the same phase shifts from the IOP to the venous cycle.

Conclusions: All subjects showed that retinal veins do not collapse when the IOP is highest, rather are their pulsation cycles in phase, which gives support to the hypothesis that IOP is not the major driving force of the retinal vein pulsations.