title: Reversed ophthalmic Doppler signal: a study of its significance.
abstract: The pathophysiological significance in carotid artery stenoses of a collateral circulation via the external carotid and ophthalmic arteries is investigated with the use of three non-invasive techniques: Doppler ultrasonography, ophthalmodynamometry and ophthalmodynamography . 21 Carotid arteries with and 26 without a stenosis greater than 50% at angiography are studied. Finding a reversed flow direction in the ophthalmic artery points towards a low pressure in the carotid syphon and indicates that the patient is, hemodynamically speaking, in danger. This concerns the cerebral as well as the retinal circulation.
mesh_terms: D001157:Arterial Occlusive Diseases / Q000175:diagnosis* / Q000503:physiopathology; D002339:Carotid Arteries / Q000503:physiopathology; D002340:Carotid Artery Diseases / Q000175:diagnosis* / Q000503:physiopathology; D003097:Collateral Circulation; D005069:Evaluation Studies as Topic; D006801:Humans; D009880:Ophthalmic Artery; D009884:Ophthalmodynamometry; D014463:Ultrasonography