| Past Issue | Volume 9 Number 2 April 2007 | | Colour Doppler Imaging Analysis of Ocular Blood Flow Velocity and Resistive Index in Glaucoma Patients |
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Dilip Pandit, Sunita Unercat, Ramesh Agrawal
Mumbai Port Trust Hospital, Mumbai, India
Aim: To use colour Doppler imaging to study the blood flow velocity and resistive index in the central retinal and short posterior ciliary arteries of patients with glaucoma.
Methods: Blood flow velocity and resistive index were assessed by colour Doppler imaging in 40 patients with primary open angle glaucoma, 40 patients with normal tension glaucoma, and a control group of 20 individuals without glaucoma. The mean peak systolic velocity, end diastolic velocity, and resistive index were measured in each patient.
Results: In the central artery, the mean peak systolic velocity and end diastolic velocity were significantly lower in the patients with primary open angle glaucoma and normal tension glaucoma than in the control group. No significant changes in any parameter were detected in the short posterior medial and lateral ciliary arteries in the patients with primary open angle glaucoma compared with controls, but there were significant decreases in end-diastolic velocity in the patients with normal tension glaucoma. Generally, the resistive index tended to be higher in patients with glaucoma than in controls, most noticeably in the central retinal artery, but the differences were not statistically significant. There were no significant differences between the 2 groups of patients with glaucoma.
Conclusion: Open angle glaucoma was associated with a decrease in both peak systolic and end diastolic velocity and a possible increase in the resistive index in the ocular vasculature, predominantly in the central retinal artery. Colour Doppler imaging appears to be a useful modality for studying ocular haemodynamics.
Key words: Blood flow velocity, Ciliary arteries, Color Doppler ultrasonography, Glaucoma
Asian J Ophthalmol. 2007;9:72-75.
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