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Biomedical subjects

C M Seery

Publications and source records attributed to C M Seery.

6 recordsLinked to original sources
PubMed1998

Choroidal neovascular membranes: treatment with reirradiation.

PURPOSE: To evaluate re-treatment with an additional course of low-dose irradiation in patients with progressive or recurrent choroidal neovascular membranes (CNVMs). MATERIALS AND METHODS: Ten patients who had received 14 Gy of external-beam radiation therapy in seven fractions for subfoveal CNVMs were found to have recurrent or persistent neovascularization at follow-up. They received an additional 15 Gy of radiation therapy administered in five daily fractions with a standard lens-sparing technique. Before reirradiation, visual acuity ranged from 20/80 to counting fingers. The median time between radiation courses was 6.5 months (range, 2-16 months). After re-treatment, the patients were followed up with angiography and visual field testing. The median follow-up was 18.5 months (range, 12-21 months). RESULTS: Eight of 10 patients (80%) maintained their visual acuity at 1 year and three of seven (43%) at 18 months. Visual acuity was stabilized in five of the 10 patients at their last follow-up. No acute or late side effects of irradiation were noted. CONCLUSION: Additional radiation therapy in selected patients with CNVMs who have failed to benefit from previous irradiation is well tolerated and appears to stabilize the disease process in a substantial proportion of these patients.

Aged↗
PubMed1993

An analysis of two fibril systems in the mammalian vitreous.

The vitreous of most mammals contains low concentrations of three polymeric macromolecules, collagen, hyaluronan and beaded fibrils. To determine whether the beaded fibrils may have a localized function, or whether all three of these polymers could contribute to the structure and/or strength of the vitreous gel, the distribution of collagen and beaded fibrils in the central and cortical regions of the bovine vitreous was studied. The polymers were separated by isopycnic centrifugation and analyzed to determine the protein ratios. Both collagen and beaded fibrils are present in each region, but the concentration of the beaded fibril is greatest in the posterior cortical volume.

Animals↗
PubMed1991

Collagens of the bovine vitreous.

The predominant structural components of the vitreous are collagenous fibrils. Prior biochemical analyses have been limited by incomplete solubilization of the constituent collagen types. The techniques described enable an effective separation and nearly complete solubilization of calf vitreous fibrils. Semiquantitative analysis has led to the detection of types II, V, and IX collagen in a ratio of 69:24:7, respectively. Qualitatively similar ratios were found in vitreous from other mammals, including rabbits, monkeys, and humans. Electron microscopic evidence suggests that type VI collagen may be distributed selectively near the vitreous base. These observations are pertinent to vitreous gel stabilization, aging, and disease.

Aging↗
PubMed1990

Distinctive cataract in the Stickler syndrome.

We determined the clinical characteristics of cataract in 133 patients with the Stickler syndrome. Cataracts of various types or aphakia were found in 115 of 231 eyes (49.8%) studied. The most frequent and distinctive lesions, described as wedge and fleck cataracts, accounted for 40 of the 93 cataracts (43.0%) observed. These distinctive opacities may serve as a clinical marker for the Stickler syndrome and facilitate early diagnosis.

Adolescent↗
PubMedDate not supplied

Pathophysiology and management of subretinal hemorrhage.

Subretinal hemorrhage can arise from the retinal and/or choroidal circulation. Significant subretinal hemorrhage occurs in several conditions, but most commonly is associated with age-related macular degeneration, presumed ocular histoplasmosis, high myopia, retinal arterial macroaneurysm, and trauma. Released toxins, outer retinal shear forces, and a diffusion barrier created by subretinal hemorrhage all contribute to photoreceptor damage and visual loss. The use of tissue plasminogen activator and improvements in surgical instrumentation have facilitated surgical drainage and have made it a useful option in the management of selected cases. Mechanisms of subretinal hemorrhage formation, underlying etiologies, diagnostic evaluation, and the histopathology of damage are summarized. Published surgical series are reviewed and surgical advances are summarized. The value of surgically removing subretinal hemorrhages to improve visual outcome remains unestablished, because definitive studies have not been performed. Guidelines for selecting candidates for surgical intervention are proposed.

Animals↗