Orbital Color Doppler Imaging in Carotid Occlusive Disease
Louise A. Mawn, MD;
Thomas R. Hedges III;
William Rand, PhD;
Paula A. Heggerick, RVT, RDMS
Arch Ophthalmol. 1997;115(4):492-496.
Abstract
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Objective
To define orbital circulation abnormalities identified by color Doppler imaging in patients with severe carotid occlusive disease.
Patients
Twenty-four patients referred to a hospital-based neuro-ophthalmology service with hemodynamically significant carotid occlusive disease (>75% stenosis) were prospectively studied. Eight had signs of ocular ischemic syndrome; 12 of the 24 patients underwent endarterectomy.
Main Outcome Measures
Peak systolic velocity of the central retinal, posterior ciliary, and ophthalmic artery and pulsatility indexes as determined by color Doppler imaging.
Methods
Color Doppler imaging was performed using a 7.5-MHz probe. Both eyes were studied in all patients and carotid duplex imaging was obtained.
Results
All patients with hemodynamically significant carotid occlusive disease had lower mean peak systolic velocities in the central retinal, posterior ciliary, and ophthalmic arteries and higher pulsatility indexes compared with normal control patients. Endarterectomy improved peak systolic velocities. Reversal of ophthalmic flow direction as a separate variable was unassociated with altered mean central retinal or posterior ciliary artery flow velocities. Patients with ocular ischemic syndrome may have similar orbital color Doppler imaging findings compared with patients with severe carotid occlusive disease without overt manifestations of chronic ocular ischemia.
Conclusion
Orbital circulation is highly adaptable even when faced with severe compromise in proximal blood flow.
Author Affiliations
From the New England Eye Center (Drs Mawn and Hedges and Ms Heggerick) and the Department of Family Medicine and Community Health (Dr Rand), Tufts University, Boston, Mass. The authors have no commercial or proprietary interest in any of the instruments used in this investigation.
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