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Biomedical subjects

M Sterkers

Publications and source records attributed to M Sterkers.

13 recordsLinked to original sources
PubMed1990

[Dye lasers: experimental histopathologic study of the effects of various wavelengths on the macular region].

Pathological experimental study of dye laser photocoagulation simulating the confluent treatment of subretinal new vessels in the macular area of a Macacas Cynomolgus monkey. 38 days after treatment the lesions become similar on the choriocapillaris and retinal pigment epithelium whatever the wavelength; the choriocapillaris is always occluded and the pigment epithelium destroyed. The internal limiting membrane is ondulated only with yellow and orange colors. These results are compared to those of similar experimental studies.

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

[The dye laser: experimental and clinical results in subretinal macular neovascularization].

The tunable dye laser provides now a large assortment of monochromatic wavelengths that allow selective targeting on individual tissues in the retina, according to in vitro studies showing extinction coefficient of ocular pigments (xanthophyllic pigment, rhodopsin, melanin, lipofuschin, hemoglobin) for different laser wavelengths. Confluent heavy and juxtafoveolar laser burns in eyes of cynomolgus monkeys showed, after 38 days, similar lesions in all the wavelength studied (green, red, yellow, orange) at the level of the choriocapillaris, Bruch's membrane, pigment epithelium and photoreceptor's layers. However, the inner retina layers were discretely more damaged with yellow and orange than with green and red. In clinical approach, the effects of these different wavelength haven been compared in human eyes presenting with subfoveol new vessels and disciform age-related macular degeneration. After healing, the scar was similar biomicroscopically, and on fluorescein angiography with all wavelengths studied (green, red, yellow, orange). In conclusion, dye laser seems to be efficient and easily tunable for photocoagulation in macular area.

Aging↗
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↗
PubMed1988

[Winer's cutaneous calcinosis. Apropos of a case with eyelid localization].

A case of Winer's solitary cutaneous calcinosis is used as a basis for a literature review of this rare, benign dermatosis. Despite concordant clinical features diagnosis of this lesion is histologic. Normal blood biological values, a debated etiopathogenicity and the need to eliminate a collagen disease are important factors to bear in mind before making this diagnosis of such a cutaneous lesion, for which exeresis ensures a cure.

Adult↗
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↗
PubMed1987

[Eyelid localization of a Merkel cell tumor (trabecular carcinoma)].

The authors present four cases of Merkel cells tumor of the eyelid. These cases conform to the standard clinical and histological criteria specified in the dermatological literature. Immuno-histochemical studies have been performed (specific neuron enolase, cytokeratin KL 1). Il the last case an ultrastructural study has made evident the characteristic neurosecretory granulations and intermediate filaments. Various hypothesis concerning the origin of this tumor are discussed in light of anatomical evidence.

Adenocarcinoma↗
PubMedDate not supplied

[Prognosis in idiopathic retinal periphlebitis. Apropos of 14 cases].

Fourteen patients (26 eyes) suffering from idiopathic retinal periphlebitis were followed during a mean time of 6 years (2 to 11 years). At the first examination, five eyes presented with irreversible loss of vision (tractional retinal detachment, neovascular glaucoma). At the end of follow-up, the visual acuity was inferior to 0.1 in 6 eyes, between 0.1 and 0.5 in 7 eyes, superior to 0.6 in 13 eyes. In 70% of cases, initial visual acuity was maintained or ameliorated. New vessels were present in association with significant capillary closure in 18 eyes (70%). Cystoid macular edema appeared in 7 eyes (27%). Steroid therapy, or immunosuppressants in few cases, were usefull to suppress intraocular inflammation. Laser photocoagulation was performed in 18 eyes in order to prevent or reduce ocular neovascularization; beneficial results were obtained in 13 eyes.

Adrenal Cortex Hormones↗