Search

Complex ultrasound examination was performed in 108 children with unilateral congenital cataract (UCC) and persisting hyperplastic primary vitreous syndrome (PHPVS) to reveal indications and contraindications for surgery. The presence of functioning vessels with linear blood flow velocity (LBFV) measurement was performed in fibrovascular band and retrolenticular membrane (RLM) in different stages of PHPVS using color Doppler and energetic mapping. The echographic density of fibrovascular band and RLM was estimated using echodensitometry. The results of the study showed correlation of PHPVS severity and fibrovascular band diameter, LBFV in the vessels of the band and echographic density of the band, RLM and their thickness as well.

In children with persistent hyperplastic primary vitreous body (PHPVB) concurrent with unilateral congenial cataracts (UCC), combined ultrasound study used to examine blood supply to and hemodynamics of the hyaloid system--a fibrovascular band. To determine the prognosis of a surgical intervention in the mode of color and energy Doppler mapping in the persistent band, retrolenticular membrane, the authors studied whether they had functioning vessels and linear blood flow velocity in different degrees of PHPVB. Based on the results of combined ultrasound study, the authors defined indications for and contraindications to surgical treatment of UCC concurrent with PHPVB in order to prevent hemorrhagic complications (hyphema, hemophthalmos, hyaloid vascular bleeding), as well as the optimal time of surgical treatment.

Hemodynamic parameters were studied in the ophthalmic artery, short posterior ciliary arteries (SPCA), long posterior ciliary arteries (LPCA), and central artery of the retina (CAR). Doppler ultrasound study (DUSS) was performed on an Acuson Aspen multipurpose diagnostic system using a linear transducer at a frequency of 7.5 MHz in the pulse mode. Chelyabinsk students aged 17-25 years were examined. A number of specific features of retinal blood supply were detected in young persons with dystrophic diseases of the periphery of the fundus oculi. These included decreased blood flow velocities and less systolic flow acceleration time in SPCA, LPCA, and CAR in peripheral vitreochorioretinal dystrophies (PVCRD). The higher pulsatile index (PI) in the LPCA system characterized a possible mechanism responsible for compensation of impaired blood supply in the retinal periphery in the development of PVCRD. The high values of the pulsatile index and the vascular wall resistivity index in CAR reflected the changes determining the absence of complications as retinal ruptures and detachment. There were neither changes in ophthalmic arterial blood flow depending on the type of PVCRD and the nature of its course nor significant differences in blood supply to the eye in different types of refraction.

The results of examining the hematoophthalmic barrier permeability by radiometry and biotests with anterior chamber and vitreous humor are analyzed. Injection of the radiopharmaceutical into the vorticose veins provides the most effective pharmacokinetics, vs. suprachoroidal and subconjunctival injections. In toxis allergic uveitis the penetration of radiopharmaceuticals into the internal media of the eye (anterior chamber humor and vitreous body) is intensified, and dexason therapy of an inflammatory process in the vascular coating reduces this penetration.