| Popis: |
The purpose of this research was to study the features of the comorbid course of ischemic diseases of the visual organ and chronic cerebral ischemia in atherosclerosis. The material for this study was the results of complex examinations of 37 patients (74 eyes) with ischemic diseases of the visual organ in combination with chronic cerebral ischemia and atherosclerotic vascular lesions. In addition to complex ophthalmologic examination, ultrasound examination with color Doppler mapping of extracranial and intracranial segments of the great vessels of the brain, Color-Doppler sonography and magnetic resonance imaging of the brain with tractography were used to study the peculiarities of the course of ischemic diseases of the visual organ in chronic cerebral ischemia. The quantitative characteristics of blood flow in the vessels of the eye and brain were the maximum systolic, final diastolic speeds, resistance index, carotid - ophthalmic ratio. Analysis of the results of the study revealed a change in visual function to varying degrees in all patients, depending on the ratio of the degree of damage to middle cerebral artery and anterior cerebral artery, ophthalmic artery, central retinal artery and posterior short ciliary artery as well as time when a patient requested medical assistance. The data obtained from Doppler studies of extracranial and intracranial segments of the great vessels and magnetic resonance tractography correlated with changes in Color-Doppler sonography, visual impairment and the detection of defects in the visual field. Pathological changes in the extracranial and intracranial segments of the great vessels negatively affect not only the parameters of the blood circulation of the cerebral vessels, but also exacerbate disturbances in the parameters of the blood circulation of the vessels of the eye, which leads to the progression of ischemic diseases of the visual organ. The degree of viability of collateral circulation is of great importance in the development of chronic cerebral ischemia and the progression of ischemic diseases of the organ of vision. All thus, the good consistency of collateral hemodynamics eliminates ischemia of brain and eye tissues, while visual functions are less affected. |
