Orbital color Doppler imaging in carotid occlusive disease
Autor: | Louise A. Mawn, Thomas R. Hedges, William M. Rand, Paula A. Heggerick |
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Rok vydání: | 1997 |
Předmět: |
Adult
Carotid Artery Diseases Male Duplex ultrasonography medicine.medical_specialty genetic structures medicine.medical_treatment Arterial Occlusive Diseases Endarterectomy Eye Ischemia medicine.artery Internal medicine medicine Animals Humans Postoperative Period Prospective Studies Ultrasonography Doppler Color Aged Aged 80 and over Vascular disease business.industry Blood flow Middle Aged medicine.disease Surgery Ophthalmology Stenosis Ophthalmic artery Cardiology Female Ocular ischemic syndrome Rabbits business Orbit Blood Flow Velocity |
Zdroj: | Archives of ophthalmology (Chicago, Ill. : 1960). 115(4) |
ISSN: | 0003-9950 |
Popis: | 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. |
Databáze: | OpenAIRE |
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