Showing papers on "Retinal Vein published in 1984"

Intraocular pressure in retinal vein occlusion.

Abstract: The intraocular pressure of 59 patients with retinal vein occlusion was studied. Central retinal vein occlusion (CVO) was diagnosed in 24 patients and branch retinal vein occlusion (BVO) was diagnosed in the rest. The intraocular pressure of a sex and age matched group of controls was also studied for comparison. The intraocular pressure in the CVO group were significantly different from those of the matched controls (p less than 0.001). A statistically significant difference of a lesser degree (p less than 0.05) was also found in a comparison of the intraocular pressures of the BVO group with those of their sex and age matched group of controls. These findings may indicate the possible role of increased intraocular pressure in the pathogenesis of CVO and BVO.

Dual Trunk Central Retinal Vein Incidence in Clinical Practice

Abstract: • In a study carried out on 123 eyes to establish the incidence of dual trunk central retinal vein, 25 (20.5%) eyes showed such an arrangement. The presence of such anomalies has also been substantiated through the results of anatomical, histological, and microdissectional studies by various workers. The zone of the retina drained by the individual central retinal vein varied from 30% to 70%. The arrangement was not only superior or inferior, but could also be medial, lateral, diagonal, or crossed. The clinical relevance of this finding is a newly described fundus condition called hemi-central retinal vein occlusion .

The influence of ticlopidine on the natural course of retinal vein occlusion.

Abstract: A double-blind study was established to evaluate the platelet aggregation inhibiting effect of ticlopidine on the course of ocular vein occlusions. 35 patients with recent central retinal vein occlusions and 54 patients with retinal branch vein occlusions were treated for 6 months. Various ophthalmological and clinical-chemical parameters, including fluorescence angiography, were assessed. Compared with placebo therapy a significant improvement in visual acuity was observed with ticlopidine for branch vein occlusions; the same trend was seen for the central retinal vein occlusions. Increased ADP-induced platelet aggregation was frequently found: in 72% of the central retinal vein occlusions and 70% of the branch vein occlusions. For the Wu and Hoak test, these numbers were respectively 74% and 67%. Hypertension was seen in 55% of all occlusions, hyperlipaemia in 33%, and diabetes in 29%. The effect of ticlopidine was most pronounced in patients with increased platelet aggregation and least obvious in hyperlipaemia. Hypertension and diabetes did not apparently influence Ticlopidine's effects. It is concluded that the platelet aggregation inhibitor ticlopidine is effective in the treatment of recent ocular vein occlusions.

Venous macroaneurysm associated with branch retinal vein obstruction.

Abstract: A saccular venous macroaneurysm was associated with a chronic ischemic branch retinal-vein obstruction. Only one case of a macroaneurysm involving a vein has been previously reported. Factors contributing to the pathophysiologic features of arterial, venous, and capillary macroaneurysms are also described.

Central retinal vein occlusion in a case of arteriovenous communication of the retina.

Abstract: A case of isolated arteriovenous communication of the retina (AVCR) decompensated to central retinal vein occlusion and visual loss resulted. This decompensation is not rare. Therefore, photocoagulation of the shunting vessels has to be the preferred treatment.

Solitary silent venous papillary loops and ocular hypertension.

Abstract: A series of 24 eyes in 23 patients is described showing solitary silent venous papillary loops. These loops are usually associated with a considerable degree of ocular hypertension, presenting when this hypertension is being investigated. They are silent, usually with no previous ocular history, single with a large diameter, affecting veins at the optic disc and not extending into the vitreous. The optic disc is cupped, but usually not more than 0.6 disc diameter, there is good central vision and either a full visual field or only early field loss. Fluorescein angiography shows the loops to be competent with no evidence of any other retinal vascular abnormality. Rarely loss of central vision may occur due to progression to advanced glaucoma. The condition is distinct from prepapillary vascular arterial papillary loops, neovascularization at the optic disc and optociliary shunt vessels. It is also distinct from the venous collateral vessels which develop at the optic disc after acute central or branch retinal vein occlusion. These collaterals are usually multiple, the accompanying ocular hypertension is of lesser degree, cupping of the disc and field loss are usually much more advanced and, while visual acuity may be normal, it is often grossly reduced. On fluorescein angiography all these cases of venous collaterals after retinal vein occlusion showed evidence of other retinal vascular dysfunction. Solitary silent venous papillary loops appear to develop from venules on the optic disc as a bypass to a low grade venous occlusion which is seldom clinically manifest. They form a distinct entity with a good prognosis if the accompanying ocular hypertension is carefully controlled.

Thrombose veineuse oculaire et pathologie vasculaire générale

Abstract: A retrospective study was carried out covering 100 patients hospitalized at the Geneva Ophthalmological Clinic between 1973 and 1977, in whom an occlusion of the central retinal vein or one of its branches had been diagnosed. An attempt was made to assess the significance of the occurrence of venous occlusion and the relation between the angiographic fundus aspect, the general pathology, and the survival prognosis. The patients still alive were examined between 1982 and 1983, and the occurrence of general vascular pathology was compared with a control group. The results of this study indicate the important role played by arterial pathology (hypertension, arteriosclerosis, diabetes) in the pathogenesis of retinal vein occlusion. It was found that patients presenting an ischemic type of venous occlusion were in a higher risk category as regards the development of cardiac or cerebral ischemia.

Perfusion of occluded retinal veins in the cat's eye.

Abstract: The organisation and adherence of a clot induced experimentally in the retinal vein of a cat was studied in vitro. For this purpose a retinal vein was treated in vivo with argon laser photocoagulation in 31 eyes, and each eye was removed at periods of time varying between 3 hours and 7 days after treatment. The freshly enucleated eye was then placed in a perfusion chamber with the cornea under a contact lens, and the retinal vessels were perfused under direct microscopic visualisation. It appears that the hydrostatic pressure and flow needed to perfuse the obstructed vein has to be increased with elapsing time, and that 7 days after laser treatment the retinal vessel becomes permanently occluded.

Retinal venous sheathing in multiple sclerosis.

Abstract: Multiple sclerosis is among those disease entities in which sheathing of the retinal veins has been documented. A case with marked unilateral retinal vein sheathing in a patient with a diagnosis of multiple sclerosis is reported. Discussion with reference to epidemiology, etiology, histopathology, differential diagnosis, and management is presented.