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At least 19 recordsLinked to original sources
PubMed1990

Ultrastructural distribution of collagen types I-VI in aging human retinal vessels.

Retinal vessels from freshly enucleated human eyes were classified into three stages of the hyalinisation process. The distribution of collagen types I-VI within the vessel walls was studied ultrastructurally by immunogold labelling combined with the tissue preparation techniques of cryoultramicrotomy and London resin white embedding. Collagen types I, III, IV, V, and VI were found in large vessels, types I, IV, and V plus small amounts of III and VI in small vessels, and types I, IV, and V in capillaries. Hyalinised vessel walls consisted mainly of types I, IV, and VI collagen.

Adult↗
PubMed2000

[Retinal vessel reaction to 100% O2-breathing--functional imaging using the retinal vessel analyzer with 10 volunteers].

BACKGROUND: Retinal vessel diameter assessment is complicated by various components among them dynamic changes due to vasomotoric effects. Measurement of these diameters was usually obtained from fundus photographs. Functional diameter changes induced by external stimuli were difficult to evaluate because of their dynamic nature. The Retinal Vessel Analyzer (RVA) allows continuous on-line measurement of those dynamic changes. Whether functional changes due to 100% O2 breathing can be assessed by RVA is investigated in this study. MATERIALS AND METHODS: Continuous on-line registration of retinal arterial and venous branch vessels was obtained in 10 healthy volunteers. A baseline was taken during the first minute. Then for 5 minutes 100% O2 was delivered by mask. Further recording ensued for 4 minutes, while breathing room air. Vessel diameter change in percent to baseline was calculated for each individual and for a mean of the group. RESULTS: Each individual demonstrated vasoconstriction. The mean diameter reduction for the group was 6.5% for arteries and 15% for veins. CONCLUSIONS: RVA allows assessment of functional retinal branch vessel reactions. Retinal branch vessels diameters are denominators for capillary perfusion. RVA might be able to demonstrate an individual vessel's regulation potential by purposeful stimulation to constrict and dilate. This property could be helpful in understanding pathophysiologic processes as well as improving diagnosis and therapeutic effects in diseases influencing ocular perfusion such as diabetes, retinal vessel occlusion or even glaucoma. Further evaluation of effects of systemic diseases might be an additional application of functional retinal vessel diameter assessment by RVA.

Adult↗
PubMed1985

Avulsed retinal vessels with and without retinal breaks--treatment and extended follow-up.

Between 1975 and 1984 65 cases of avulsed retinal vessels were studied. Of these 57 had avulsed vessels with retinal tear and 8 without. Of the affected eyes: 55.38 per cent were emmetropic, while myopia was present only in 29.23 per cent. Degenerative alterations (lattice-like lesions) were found in 4.61 per cent of cases. Argon laser treatment was applied in 30 cases (Group A), episcleral sponge implant with cryopexy and, in some instances, subsequent laser treatment in 34 cases (Group B). In one case vitrectomy with endodiathermy was performed. With the silastic sponge implants (Group B) we tried to obtain a high buckle in order to achieve immobilisation of the avulsed vessel through contact with the implant. The implants were applied in cases of avulsed vessels located posterior to the equator. Group B (sponge implant) showed fewer haemorrhagic recurrences after treatment than did Group A (laser application), the difference however was not statistically significant. It is also worth mentioning that in Group B the avulsed vessels which were occluded or empty of blood were to a statistically significant extent more numerous than in the laser-treated Group A. Retinal breaks with one or more avulsed retinal vessels constitute a distinct but uncommon clinical entity, which was first noted by Clark in 1962. Retinal vessels can also be avulsed by vitreous traction without a concurrent retinal tear, but can also be avulsed by vitreous traction without a concurrent retinal tear, but this condition is found much more rarely.(ABSTRACT TRUNCATED AT 250 WORDS)

Humans↗
PubMed2001

Echographic evaluation of a patient with diabetes and dense vitreous hemorrhage: an avulsed retinal vessel may mimic a tractional retinal detachment.

PURPOSE: To report that an avulsed retinal vessel may appear as a tractional retinal detachment on echographic evaluation. METHODS: Case report. RESULTS: A 57-year-old diabetic woman presented with a nonclearing vitreous hemorrhage of 2 months duration in the left eye. Echography was consistent with a localized tractional retinal detachment on longitudinal sections; transverse sections demonstrated a pinpoint opacity in the vitreous cavity. Intraoperatively, an avulsed retinal vessel was noted in the area of echographic abnormality. CONCLUSION: An avulsed retinal vessel may mimic tractional retinal detachment on echography. Although trained ophthalmic echographers routinely perform both longitudinal and transverse sections during an echographic evaluation, less skilled observers must be aware of the importance of performing both longitudinal and transverse sections for accurate echographic diagnosis.

Diabetes Mellitus, Type 1↗
PubMed1987

Types of avulsed retinal vessels associated with rhegmatogenous retinal detachment: treatment and results.

We performed a prospective study of 87 cases with avulsed retinal vessels in conjunction with tears and rhegmatogenous retinal detachment. The postoperative follow-up period ranged from 6 months to 5 years. The avulsed vessels were classified according to their location (peripheral or central) as well as with respect to their form (5 types). The surgical procedure comprised the fixation of an episcleral sponge implant (high indentation), cryoapplication, and, if necessary, laser coagulation or endodiathermy at a later stage. The postoperative condition of the avulsed vessel mainly depended on its location, the type of avulsion, and the buckle height.

Humans↗