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Biomedical subjects

A Gaudric

Publications and source records attributed to A Gaudric.

At least 19 recordsLinked to original sources
PubMed1992

Quantification of angiogenesis due to basic fibroblast growth factor in a modified rabbit corneal model.

The rabbit corneal angiogenesis assay was modified to allow quantification of the neovascular response induced by growth factors. Basic Fibroblast Growth Factor (bFGF) was used for this experiment. bFGF was diluted in phosphate buffer solution (PBS) in such a way that 2 microliter of solution contained concentrations ranging from 17 to 1,200 ng. Each drop was absorbed by a 1 x 2 mm particle of a dried 70% hydratable hydrogel and implanted into a mid-stroma corneal pocket, 2 mm from the limbus. Iodinated bFGF was used to measure growth factor diffusion in the cornea, which was found to be isotropic. Autoradiography showed that bFGF was stored in the cornea at both epithelial and endothelial level. Corneal neovascularization occurred on the second day after implantation and was maximal on the 7th day. At this time the neovascular surface was measured by planimetry on corneal photographs and compared with controls. This method allows precise definition of the dose of any substance to be implanted into the cornea and induces a rapid neovascular response, thus allowing quantitative evaluation of neovascularization within one week. A neovascular response was detectable for doses as low as 35 ng of bFGF and increased proportionally to the dose of bFGF implanted.

Animals↗
PubMed1992

[Surgery of idiopathic epimacular membranes. Prognostic factors].

Seventy consecutive cases of idiopathic epimacular membrane removal were reviewed in order to evaluate the prognosis factors of this surgery. The characteristics analyzed where the duration of the symptoms, pre and postoperative visual acuity and the macular changes on fluorescein angiography. The mean follow-up after surgery was 9 months. Mean preoperative visual acuity was 0.17 and the mean best postoperative visual acuity 0.43. Visual acuity improved by 2 lines or more in 81% of the cases and the mean improvement was 3.5 lines. The complications of epimacular membrane surgery included nuclear cataract (10 eyes underwent cataract surgery), peripheral retinal breaks (3%), and retinal detachment (3%) successfully operated. Three of the main preoperative data were related to better postoperative visual outcome: preoperative visual acuity: eyes with visual acuity of 0.16 or more tended to have better postoperative vision than eyes with poorer preoperative vision (mean postoperative visual acuity 0.5 and 0.34 respectively; p < or = 0.05); duration of visual impairment before surgery: eyes with a visual impairment of less than 2 years had better postoperative vision than the others (mean postoperative visual acuity, 0.5 and 0.3 respectively; p < or = 0.05); the absence of preoperative angiographic macular edema: eyes without preoperative macular edema had better postoperative vision than the others (mean postoperative visual acuity: 0.5 and 0.4 respectively; p < or = 0.05). The normal postoperative pattern of macular vessels and foveolar shape was also a statistically significant factor of good vision recovery.

Adult↗
PubMed1992

[Changes in the fundus in subacute sclerosing panencephalitis. Apropos of 23 cases].

Subacute sclerosing panencephalitis (SSPE) is a fatal slow encephalitis. It is related to a chronic infection of the central nervous system by a defective measles virus. Among 41 patients with SSPE, 23 had ocular involvement. The ophthalmologic involvement preceded the onset of neurological signs in 4 cases, they were detected at first presentation in 9 cases, and they occurred in the course of the disease in 10 cases. The ocular involvement was bilateral in 19 cases. Various ophthalmologic features were reported: retinitis (16 eyes), macular pigment disturbances (4 eyes), optical neuritis (33 eyes), visual agnosia (1 patient). The macular lesions were typical of the disease, but at the acute stage they were liable to be confused with toxoplasmosis. This complication of measles should disappear with the systematic vaccination of 12 month old children.

Adolescent↗
PubMed1991

Pseudophakic retinal detachment.

We reviewed 165 cases of non-referred pseudophakic retinal detachment. Fifty-three eyes (32%) had sustained significant complications due to cataract surgery prior to retinal detachment; 45 eyes (27%) presented with grade B, C or D proliferative vitreoretinopathy. The overall reattachment rate was 84%. This was significantly higher in the posterior chamber lens group than in the iris-fixated lens or anterior chamber lens groups (93 vs. 69 and 81%). Our data show that uneventful extracapsular cataract extraction plus posterior chamber lens implantation offers the best chance of successful detachment surgery.

Adult↗
PubMed1989

Immunological study of acidic fibroblast growth factor (aFGF) distribution in the eye.

During the last ten years, several groups, including the present authors, have detected growth factor activities in various ocular tissues, and the presence of a ubiquitous Eye-Derived Growth Factor (EDGF) has been described. More recently, isolation and characterization of this growth factor activity from the retina led to the identification of two molecules. These molecules were shown to be identical to other growth factors isolated from neuronal and non-neuronal tissues and are now designated as acidic and basic fibroblast growth factor (aFGF, bFGF). The biological function and the reason for the ubiquitous distribution of these factors remain unclear. Understanding may be improved by quantification of this distribution in various tissues during development. In the present study, specific polyclonal antibodies were raised against acidic FGF, aFGF was determined in various ocular tissues by enzyme immunoassay, and the localization of immunoreactive aFGF by immunohistological staining with fluorescent antibodies or with enzyme- or gold-labeled antibodies was studied. In almost all tissues tested aFGF was found; but the retina, cornea, and vitreous body contained the highest levels of aFGF per gram of tissue. In the retina, aFGF was associated primarily with the nerve fiber layer and the inner and outer segments of the photoreceptors, whereas corneal aFGF was detected in the cytoplasma of the basal layer of epithelial cells.

Animals↗
PubMed1989

[Indications for photocoagulation in idiopathic retinal periphlebitis].

Fourteen patients (23 eyes) with idiopathic retinal periphlebitis were followed during a mean time of six years. Argon laser photocoagulation was performed in 18 eyes: in 11 eyes for large retinal ischemic areas, and in 7 eyes for disc or peripheral neovascularization. Beneficial results were obtained in 72.5% of the treated patients. Laser photocoagulation seems to be useful to prevent or reduce ocular neovascularization associated with idiopathic retinal periphlebitis, and to prevent vitreous hemorrhage. Photocoagulation did not increase ocular inflammation and should be limited to ischemic areas.

Adult↗
PubMed1989

[Vitreous hemorrhage and neovascular proliferation in multiple sclerosis].

We report the case of a 40 year-old man with multiple sclerosis, who presented a bilateral proliferative retinopathy responsible for a vitreous hemorrhage. Examination of the periphery of the retina showed diffuse retinal periphlebitis; fluorescein angiograms showed a peripheral retinal ischemic syndrome with secondary neovascularization. Several recent studies have show that retinal periphlebitis is a frequent finding in multiple sclerosis; but to our knowledge a retinal ischemic syndrome with neovascularization has seldom been reported.

Adult↗
PubMed1989

[Collodion baby. Apropos of a case with eye manifestations].

We report a case of a male collodion baby, born at term of a consanguineous couple of Afghan origin. The new-born baby displayed a pseudo-dysmorphic syndrome predominant of the face, with a marked ectropion of the upper and lower eye-lids and chemosis, without corneal involvement. The condition improved with time but complete regression was not obtained. Collodion baby syndrome is a pathologic skin condition observable during the neonatal period. Long term evolution is towards ichthyosis in 90% of cases, and resolution in 10%.

Ectropion↗
PubMed1989

[Retinopathy in pancreatitis].

Three patients with retinopathy associated with acute pancreatitis were observed. Each of them had a long history of alcohol abuse. The first patient was asymptomatic. Second one developed moderate visual loss in one eye (visual acuity 20/40), with a fascicular defect on Goldmann visual field registration. Third patient complained with bilateral and severe visual loss, with a large central scotoma. Cotton-wool patches and hemorrhages were present in the mild types of retinopathy. These cases had a good prognosis. An ischemic edema of posterior pole was associated in severe type of retinopathy. In this case, fluorescein angiography showed occluded macular retinal arterioles. Visual prognosis was poor. Pathogenesis of the lesions is still discussed. The main hypothesis are fat emboli or activated complement-induced granulocyte embolus formation. Efficacity of corticosteroids is not known.

Acute Disease↗
PubMed1989

[Rothmund's syndrome].

Rothmund's syndrome was observed in a 9 year old boy. Parental consanguinity was present, but no siblings were affected. He presented with rapidly progressive bilateral cataracts. Visual recuperation was excellent after "in the bag" phakoemulsification and intercapsular implantation. There were no other ocular anomalies. Extensive erythematous skin changes appeared when the boy was 3 months old and, at the time of presentation, he had poïkiloderma predominantly in those areas exposed to light (face and hands). There were no associated anomalies of the nails or hair, no endocrine disorder nor other malformations. A brief review of this syndrome is presented and treatment of these cataracts discussed.

Cataract↗
PubMed1988

[Photocoagulation with the argon laser in cystoid macular edema in retinal venous occlusions. Apropos of 68 cases].

Sixty-eight consecutive eyes with cystoid macular edema due to venous occlusion were treated by grid laser photocoagulation. The diagnosis of cystoid macular edema was based on both the biomicroscopic and angiographic findings. The treatment was applied with blue-green or green argon laser. The criteria for treatment were the presence of cystoid macular edema, visual acuity of 0.5 or less and duration of the venous occlusion for more than 6 months. The technique of treatment included direct photocoagulation of certain microaneurysms and of collateral dilatations exhibiting fluorescein leakage in the macular area, followed by grid photocoagulation applied to the area of cystoid edema. No laser burn was placed within 300 microns of the center of the macula. The patients were followed for periods of 6 to 24 months with a mean follow-up of 15 months. Forty-five eyes presented with a branch vein occlusion. Photocoagulation resulted in the decrease or disappearance of macular edema in 42 of these eyes (93%) and the improvement of visual acuity by 0.2 or more in 12 (27%). Twenty-three eyes presented central vein occlusion. In these cases, photocoagulation resulted in the decrease or disappearance of macular edema in 20 eyes (87%), and visual acuity improved by 0.2 or more in 4 (17%). These results indicate that grid laser photocoagulation is an effective method, reducing persistent cystoid macular edema due to venous occlusion. However, visual results were better in the branch vein occlusions than in the central vein occlusions.

Aged↗
PubMed1987

Retinal detachment after choroidal ischemia.

Injection of a 15-micron microsphere suspension through one or two vortex veins of nine monkey eyes caused various degrees of sectorial choroidal ischemia, which were documented by fluorescein angiography and electron microscopy. The severity of the lesions to the fundus depended on the volume of microspheres injected (0.4 to 1.6 ml of a suspension of 600,000 microspheres/ml). Three hours after embolization white patches appeared in the retinal pigment epithelium as well as a posterior pole serous retinal detachment in five eyes. Delayed choroidal filling was noted in the quadrant involved, but a few choriocapillaris units slowly perfused, leading to fluorescein leakage in the serous retinal detachments. Histologic examination showed various types of damage to the retinal pigment epithelium, including vacuolization and cell membrane rupture.

Animals↗