Retrobulbar Ocular Blood Flow Evaluation in Open-Angle Glaucoma

Chapter

Abstract

We have currently available in the market different methods for assessing the ocular hemodynamic parameters in humans. Among them, the color Doppler imaging (CDI) is an ultrasound technique combining a simultaneous B-mode ultrasound image with Doppler frequency shifts. It allows the measurement of blood flow velocities including peak systolic velocity (PSV) and end-diastolic velocity (EDV) in the retrobulbar vessels—that is, the ophthalmic artery (OA), the central retinal artery (CRA), and the nasal and temporal short posterior ciliary arteries (SPCA). Additionally, the so-called pulsatility and resistivity indices can be calculated.

Pourcelot’s resistivity index (RI) is the most commonly used index in retrobulbar color Doppler imaging, and its value ranges from 0 to 1. Although the exact relationship between RI and vascular resistance is uncertain, it seems to be a significant relationship between the RI and the risk of visual file progression in primary open-angle glaucoma (POAG) patients. On the other hand, the pulsatility index (PI) takes into account the mean velocity. Unfortunately, this index is not readily available on all CDI devices.

Keywords

Blood Flow Velocity Pulsatility Index Glaucoma Patient Peak Systolic Velocity Ophthalmic Artery 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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© Springer International Publishing Switzerland 2016

Authors and Affiliations

  1. 1.Clinical ScienceScience and Sports ResearchAmesSpain

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