Search Results
Results 301 - 350 of 1084
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Weger M - - 2003
PURPOSE: Retinal artery occlusion is a common vision-threatening disease. Among other risk factors, coagulopathies leading to a hypercoagulable state have been associated with retinal artery occlusion. Numerous studies have shown that two genetic variants, factor V Leiden and prothrombin 20210A, cause a procoagulant state. However, their role in the pathogenesis ...
Steigerwalt Robert D RD - - 2003
The purpose of this paper is to report the use of intravenous prostaglandin E1, a potent vasodilator, to rapidly restore blood flow and vision in a patient with an acute branch retinal arterial occlusion. An 82-year-old woman with an acute decrease in the visual acuity of her left eye due ...
Weizer Jennifer S - - 2003
A 58-year-old hypertensive man with a perfused central retinal vein occlusion of 21 days' duration received 50 microg of intravitreal recombinant tissue plasminogen activator in 0.1 cc. Best-corrected visual acuity improved 2 weeks after the injection. Optical coherence tomography and fluorescein angiography demonstrated resolution of cystoid macular edema and improvement ...
Suzuki Yukihiko - - 2003
PURPOSE: To perform in vivo cannulation of retinal vessels for local application of pharmacotherapy to treat central retinal vein occlusion (CRVO), a new method was tested using rabbits. Changes following cannulation were studied histologically. METHODS: The micropipette used for cannulation was constructed from a glass tube. The outer diameter of ...
Ciardella Antonio P - - 2003
PURPOSE: To report a case of stage IV macular hole associated with ruptured retinal arterial macroaneurysm. DESIGN: Observational case report. METHOD: The patient's clinical, angiographic, and ophthalmic coherent tomography data were reviewed. RESULTS: A stage IV macular hole was observed in association with a ruptured retinal arterial macroaneurysm in a ...
Rumelt Shimon - - 2003
Retinal arterial occlusion remains a difficult clinical entity to manage. Treatment can best be categorized as conservative (ocular massage, pharmacologic, anterior chamber paracentesis) and invasive (catheterization of the proximal ophthalmic artery through the femoral artery with the infusion of thrombolytic agents). Most reports remain anecdotal due to its low incidence ...
van Overbeeke J - - 2003
The vascularization to the optic nerve is understood to come from the superior hypophyseal arteries and ophthalmic artery. However, anatomical studies about their detailed distribution to the optic nerve, especially its intracanalicular part, are rare. As the optic nerve is very prone to compression inside the optic canal, the vascularization ...
Takeshita Tetsuji - - 2003
We examined a patient with central retinal artery occlusion (CRAO) who was diagnosed as having pseudoxanthoma elasticum and exhibited angioid streaks. Echocardiography revealed stenosis and plaques of the right carotid artery. Magnetic resonance imaging (MRI) showed multiple cerebral infarctions, which were considered to be the result of vascular-endothelial abnormalities associated ...
Soares Adael S - - 2003
PURPOSE: To determine if the degree of retinal arterial diameter change is different between patients with progressive and nonprogressive open-angle glaucoma. MATERIAL AND METHODS: In this prospective cohort study, 44 eyes of 44 open-angle glaucoma patients (mean age, 67.5 years; age range, 52-84 years; mean follow-up period, 4.9 years; follow-up ...
Chen Chien-Yi - - 2003
Central retinal vein occlusion and intracerebral hemorrhage are rare diseases during infancy and are both related to venous thrombosis. We present the case of a full-term male hydrops infant without specific neurologic symptoms initially but later demonstrating bilateral central retinal vein occlusion and intracerebral hemorrhage. We conclude that routine funduscopic ...
Egan Robert A - - 2003
PURPOSE: To demonstrate retinal arterial wall plaques (RAWPs) in patients with Susac syndrome, a disorder that consists of the triad of branch retinal artery occlusion, encephalopathy, and hearing loss. The clinician may misinterpret these RAWPs as emboli. DESIGN: Observational case series. METHODS: Four patients (one man and three women, aged ...
Nagra Parveen K - - 2003
PURPOSE: To report a patient with a branch retinal vein occlusion associated with lipemia retinalis. DESIGN: Observational case report. METHODS: A 58-year-old woman presented with decreased vision and was found to have a branch retinal vein occlusion with massive lipid exudation in the setting of lipemia retinalis. Laboratory testing demonstrated ...
Bynoe Leon A - - 2003
PURPOSE: To report the results of retinal endovascular surgery and intravitreal triamcinolone acetonide on two eyes of two patients younger than 40 years of age with central vein occlusion. DESIGN: Interventional case reports from a study approved by the Institutional Review Board of North Broward Medical Center, Pompano Beach, Florida. ...
Dor Yuval - - 2003
The vascular system is unique in that extensive branching morphogenesis may take place in the adult. Developmental neovascularization is guided by precise spatial cues but vessel formation in the adult is not genetically programmed. Here, we review different adult modes for branch patterning, acquiring artery or vein identity and allocating ...
Fuller Jeffrey J - - 2003
OBJECTIVE: To test the hypothesis that retinochoroidal collateral veins (RCVs), or alternatively, retinociliary or optociliary shunts/collaterals/veins or opticociliary anastomoses, act protectively against the development of anterior segment neovascularization (ASN) following central retinal vein occlusion (CRVO). DESIGN: Case-control retrospective medical record review of patients with CRVO. PATIENTS: We identified 107 patients ...
Imada Hideki - - 2003
The blood supply to the retina and the lens in 32 gerbils (Meriones unguiculatus) of both sexes from infancy to maturity was studied under light and stereoscopic microscopes, and a scanning electron microscope. Mercox (CL-2R; Dai Nippon Ink, Tokyo, Japan) was injected into the left ventricle of 30 animals in ...
Karaali Kamil - - 2003
PURPOSE: To evaluate orbital blood flow velocities with Doppler sonography in patients with acute unilateral optic neuritis. MATERIALS AND METHODS: Orbital Doppler sonography was performed in 20 patients with acute unilateral optic neuritis. Optic neuritis was diagnosed by a neurologist on the basis of clinical presentation, presence of decreased visual ...
Kuhli Claudia - - 2003
PURPOSE: To report an association between retinal vein occlusion and increased plasma levels of histidine-rich glycoprotein. DESIGN: Observational case report. METHODS: A 56-year-old woman presented with sudden and painless decrease of visual acuity of her right eye. Indirect ophthalmoscopy revealed retinal vein occlusion. She had experienced central retinal vein occlusion ...
Pinsky Michael R - - 2003
Ppao values are routinely used to assess pulmonary vascular status and LV performance. Regrettably, under many common clinically relevant conditions, even when Ppao values are measured accurately, Ppao values at baseline and in response to therapy often reflect an inaccurate measure of cardiovascular status. Thus, caution should be used when ...
Budde Wido M - - 2003
PURPOSE: The pattern of neuroretinal rim loss and increase in the area of parapapillary atrophy in glaucoma depend on the localization of the central retinal vessel trunk in the lamina cribrosa. The purpose of the present study was to determine whether, in a similar way, the pattern of rim loss ...
Rogers Adam H - - 2003
Polypoidal choroidal vasculopathy is an abnormality of the choroidal vasculature characterized by aneurysmal-like budding of the vessels with exudation and recurrent serosanguinous detachments of the retinal pigment epithelium. Treatment is limited to laser photocoagulation of leaking vessels, which is used when vision is decreased, or exudate and hemorrhage threaten or ...
Stingele Robert - - 2003
The percentage of cranial vascular volume that undergoes arterial pulsations is estimated by 18 paired measurements in nine healthy volunteers using near infrared spectroscopy (NIRS, 10 Hz sampling frequency, 769 nm). The NIR absorption is decomposed in pulsatile and non-pulsatile components by digital filtering. The time course of absorption changes ...
Jonas Jost B - - 2002
PURPOSE: To describe a patient presenting with typical signs of vascular occlusive retinopathy. DESIGN: Observational case report. METHODS: A 65-year-old man experienced painless unilateral loss of vision to 4/20 in his left eye. Ophthalmoscopy of the left eye showed pronounced attenuation of the retinal arterioles, ischemic retinal edema, and a ...
Birinci Hakki - - 2002
PURPOSE: To evaluate blood flow parameters in the ophthalmic artery, in the posterior ciliary arteries and in the central retinal artery in eyes with primary open-angle glaucoma. METHODS: Hemodynamic parameters were evaluated by color Doppler imaging in 48 patients with primary open-angle glaucoma and 42 age-matched normal control subjects. Peak ...
Arséne S - - 2002
Retinal vein occlusion (RVO) is one of the most frequent ocular vascular diseases and leads to severe vision impairment. Colour Doppler imaging (CDI) is the first method which allows distinct evaluation of arterial and venous velocities in RVO. CDI is valuable for diagnosis of RVO and shows the effects of ...
Tomassoni Daniele - - 2002
Retinal and choroids arteries changes were investigated ophthalmoscopically and with morphometric techniques in spontaneously hypertensive rats (SHR) of 26 weeks either untreated (control animals) or treated for 12 weeks equi-hypotensive doses of the Ca2+ antagonist nicardipine or of the non-dihydropyridine type vasodilatator hydralazine. Retinal and choroid arteries hypertensive changes were ...
Martin E - - 2002
During routine fluorescein angiography, a healthy female dog demonstrated abnormal delayed filling of retinal and choroidal vessels. Fluorangiographic times were increased four- to fivefold with respect to reference values. Fluorescein angiography, using the same protocol, was repeated two weeks later and a fluorangiogram within reference values was obtained. The abnormal ...
Ninomiya Hiroyoshi - - 2002
Vasculature of the ophthalmic rete (rete ophthalmicum) in the night heron (Nycticorax nycticorax) was studied using scanning electron microscopy of vascular corrosion casts and light microscopy on tissue sections. Most blood to the eyeball and a lesser volume of blood to the brain passed through the ophthalmic rete via the ...
Zeitz Oliver - - 2002
Ocular haemodynamics play a prominent role in several ocular diseases. Recently, new methods for the determination of ocular perfusion were developed. Colour Doppler imaging (CDI) of orbital vessels has come up in the past decade and was shown to be useful in ophthalmological diagnostics. Little is known about measurement of ...
Ong Terrence J - - 2002
Ophthalmic artery hypoperfusion is a relatively uncommon clinical entity. This study illustrates the posterior segment findings of ophthalmic artery hypoperfusion in a series of nine patients. Colour photographs and relevant fluorescein angiograms highlighting the findings are shown. The retinal manifestations of ophthalmic artery hypoperfusion in this series of patients include ...
Olson Kenneth R - - 2002
The fish gill is the most physiologically diversified vertebrate organ, and its vasculature the most intricate. Application of vascular corrosion techniques that couple high-fidelity resins, such as methyl methacrylate, with scanning electron microscopy yields three-dimensional replicas of the microcirculation that have fostered a better appreciate gill perfusion pathways. This is ...
Lee William B - - 2002
Obstruction of the retinal arterial system is most commonly associated with elderly patient populations. The major etiologic factor in adults has been attributed to emboli from atherosclerotic vascular disease of the carotid arteries, with about 75% of patients over the age of 40 years demonstrating this finding. Conversely, arterial obstruction ...
Nonaka Hiroko - - 2002
The vascular architecture of the human cerebellar meninges was investigated. The surface meninges were poor in vasculature. In the sulci, the meninges were highly vascular but had few capillaries. The venous blood vessels gave long side branches at right angles to the parent vessels in a cruciform pattern, running horizontally ...
Ozdal P C - - 2002
PURPOSE: To report a case of central retinal artery occlusion associated with ocular Behçet's disease (BD) and briefly discuss retinal vasculitis due to BD. CASE REPORT: A 52-year-old man, diagnosed as BD 22 years ago and followed up with ocular involvement for six years presented with sudden loss of vision. ...
Mouradian Mikael - - 2002
BACKGROUND AND PURPOSE: A potential source of emboli is not detected in more than 50% of patients with retinal arterial occlusive events. Echocardiographic studies are not always included in the diagnostic workup of these patients. The authors studied the diagnostic yield of transthoracic (TTE) and/or transesophageal (TEE) echocardiography in identifying ...
Wilentz James R - - 2002
Carotid stenting has become an accepted alternative to endarterectomy, but fear of embolic stroke has impeded its generalized application. The retina provides a unique observatory for the study of emboli, which may occur either directly or indirectly via collaterals to the ophthalmic artery. Systems under development for cerebral protection differ ...
Cecon Stephan - - 2002
The microvascularization of the brains of the hagfishes, Myxine glutinosa L. and Eptatretus stouti, were studied by scanning electron microscopy (SEM) of microvascular corrosion casts. Sections of these casts were used to determine the vascular territories of defined brain areas. Histological serial sections (10 microm) of the brains served for ...
Bachman David M - - 2002
PURPOSE: Clinical course and autopsy findings in a patient with human immunodeficiency virus-1 immunodeficiency, central nervous system lymphoma, and bilateral, simultaneous ophthalmic artery occlusions. DESIGN: Observational case report. METHODS: Clinical examination, fundus photography, gross and microscopic pathologic study. RESULTS: Fundus photographs disclosed stasis in retinal arterioles, the absence of a ...
Prisco Domenico - - 2002
Retinal vein occlusion (RVO) is a relatively common disease that is often associated with a variety of systemic disorders including arterial hypertension, diabetes mellitus, dyslipidemia, and systemic vasculitis. There are various types of RVO, categorized on the basis of the site of occlusion and on the type of consequent vascular ...
Vallée Jean-Noël - - 2002
PURPOSE: To investigate the role of urokinase selectively perfused into the ophthalmic artery as an emergency treatment for combined central retinal arterial obstruction (CRAO) and central retinal venous obstruction (CRVO). MATERIALS AND METHODS: Over a 6-year period, 11 consecutive patients presented with recent combined CRAO and CRVO (< or =72 ...
Foroozan Rod - - 2002
OBJECTIVE: To describe the detection of emboli to the retrobulbar circulation using orbital color Doppler imaging in patients with central retinal artery occlusions (CRAO) without visible retinal emboli. DESIGN: Noncomparative, retrospective, observational case series. PATIENTS AND METHODS: Twenty-nine patients with CRAO, without funduscopic evidence of embolic material within the retinal ...
Zhang Xiaoli - - 2002
PURPOSE: This study sought to analyze the changes to clots and retinal tissue following direct infusion of tissue plasminogen activator (tPA) at different rates to the obstructed area of the retinal vein in an experimental animal model of retinal vein occlusion. METHODS: The miniature pigs, which underwent unilateral retinal vein ...
Arend O - - 2002
Normal pressure glaucoma (NPG) patients exhibit prolonged retinal arteriovenous passage times in fluorescein angiography and colour Doppler imaging suggests increased resistance downstream from the central retinal and posterior ciliary arteries. The aim of the study was to elucidate the morphological source of decreased perfusion and increased resistance of the ocular ...
Shields Jerry R - - 2002
BACKGROUND AND OBJECTIVE: To map retinal sensitivity values within glaucomatous visual field defects (VFD) to corresponding values of scanning laser polarimetry (SLP) of the peripapillary retinal nerve fiber layer using the Wirtschafter disc sector classification. METHODS: Eyes with glaucomatous VFD (N = 28) underwent SLP and Humphrey automated perimetry. The ...
Seo Man-Seong - - 2002
BACKGROUND: Cilioretinal artery occlusion rarely results in neovascular glaucoma, especially in cases of extensive cilioretinal infarction and combined retinal vascular occlusion. CASE: A 62-year-old man with diabetes mellitus and essential hypertension showed a visual acuity of counting fingers, retinal whitening temporal to the optic disc with mild dilation and tortuosity ...
Wen Feng - - 2002
PURPOSE: This is the first report of a bilateral nonischemic central retinal vein occlusions combined with artery occlusions in a patient with acquired immune deficiency syndrome (AIDS). METHODS: Case report. RESULTS: A 22-year-old Chinese (male) with a positive human immunodeficiency virus (HIV) infection developed bilateral nonischemic central retinal vein occlusions ...
Sumida Akihiro - - 2002
To gain a better understanding of the effects of spatial structure on patterns of neighbourhood competition among hardwood trees, the three-dimensional extension of primary branches was surveyed for ten community-grown Castanea crenata (Fagaceae) trees with respect to the positioning of neighbouring branches and the slope of the forest floor. There ...
Nakata Akio - - 2002
We describe a 66-year-old Japanese man in whom central retinal artery occlusion followed cardiac catheterization. After the procedure, blurred vision was noted in the right eye, and ophthalmological examination revealed an occlusion. Central retinal artery occlusion is a very rare but serious complication of cardiac catheterization. We should anticipate this ...
Ohno Yasumasa - - 2002
We reported the ophthalmic arterial velocimetry and the effect of prostaglandin E1 on that using color Doppler ultrasonography in a 29-year-old pre-eclamptic woman with postpartum weakness of vision due to retinal arterial narrowing. In this case, we found higher pulsatility index and lower mean velocity than that in normal pregnancy. ...
Ben-Ami R - - 2002
Retinal artery occlusion is rare in young adults, and may be associated with hereditary thrombophilia. We present a 19-year-old male who was evaluated for central retinal artery occlusion and found to be homozygous for the factor V Leiden mutation and heterozygous for the prothrombin G20210A mutation. Anterior chamber paracenthesis resulted ...
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