Abstract

Introduction

Materials & Methods

Results

Discussion & Conclusion

References

Discussion
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Purpose: the examination of the reliability of blood flow velocity parameters in the orbital vessels measured by means of color Doppler imaging (CDI) in glaucoma patients. Patients and methods: The CDI velocity measurements in the ophthalmic and central retinal arteries and veins, and in the short posterior ciliary arteries were performed in 100 orbits of 50 glaucoma patients. Ultramark-9 HDI ultrasound equipment with a 5-10 MHz linear probe and a 5 MHz sector probe was applied. Results: In all types of blood-vessel the individual velocity-parameters showed similar characteristic degrees of variability, characterized as a ‘coefficient of variation' (COV). The resistivity index (COV: 2.9%-10.4%), the peak systolic velocity (COV: 6.4%-13.7%) and the systolic acceleration time (COV: 7.7%-10.9%) exhibited the highest reproducibility. More test-retest variation was found in the case of end-diastolic velocity and time averaged velocity, systolic acceleration, and pulsatility index (COV: 10%-20%). Conclusion: The results of repeated measurements in the ophthalmic and central retinal arteries and veins, and in the short posterior ciliary arteries showed that measurements of peak systolic velocity, systolic acceleration time, and resistivity index can be made with high reproducibility using the CDI method. This is important since it allows accurate clinical and follow-up studies.

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Presentation Number SAnemeth0259
Keywords: color Doppler, reproducibility, glaucoma, blood circulation, orbital vessels