Search PubMed⌕ Search

Biomedical subjects

E Egger

Publications and source records attributed to E Egger.

At least 109 records · Page 6Linked to original sources
PubMed1999

FSC Health creates winning formula for freestanding elective surgery centers.

Medical specialists are developing free-standing surgery centers with or without the collaboration of local hospitals and health systems. FSC Health has a winning formula and is willing to work with hospitals and health systems as part of plans for a national expansion, but so far the physician-owned entity has expanded independently, writes Ed Egger.

California↗
PubMed1998

Proton beam irradiation of choroidal hemangiomas.

PURPOSE: To present a large series of choroidal hemangiomas treated with proton beam irradiation and to describe the treatment outcomes. METHODS: We treated 54 eyes of 53 patients with choroidal hemangioma. The lesions consisted of 48 circumscribed hemangiomas and six diffuse hemangiomas in patients with Sturge-Weber syndrome. The total applied dose was 27.3 Gy in four eyes, 22.7 Gy in three eyes, and 16.4 Gy to 18.2 Gy in 47 eyes. RESULTS: The retina reattached within six months after treatment in all 54 eyes and no recurrence of the secondary retinal detachment occurred within the follow-up period of 6 months to 9 years. Tumors treated with the higher doses regressed faster than tumors treated with the lower doses, but radiation-induced complications of the optic nerve appeared in all four eyes treated with a total dose of 27.3 Gy. Of 31 eyes treated with 16.4 to 18.2 Gy and followed for more than 1 year, 22 had an improvement in their visual acuity, and nine retained the same visual acuity. At the last follow-up examination, the best-corrected visual acuity was 20/20 or better in nine eyes, 20/40 to 20/25 in 13 eyes, 20/100 to 20/50 in six eyes, and 20/200 or less in three eyes. CONCLUSIONS: Proton beam irradiation of choroidal hemangiomas appears to be a valid therapeutic alternative. A total proton dose ranging from 16.4 to 18.2 Gy applied in four daily fractions seems adequate to ensure local control of both tumor and secondary retinal detachment.

Adult↗
PubMed1998

Colorado plans bold move to create $5 billion health sciences "city".

The University of Colorado Health Sciences Center has decided to relocate its entire campus six miles away and, collaborating with local government and private industry, create a futuristic new health sciences "city" from an old, abandoned military base.

Academic Medical Centers↗
PubMed1997

Dose distribution of proton beams with NMR measurements of Fricke-agarose gels.

Fricke-agarose gels have been irradiated with a proton beam. Then samples have been extracted at different depths with respect to the beam penetration distance, corresponding to different irradiation doses. Relaxation times T1 and T2, measured at 17 MHz, appear sensitive to this kind of radiation. In particular, T2 exhibits three components T2a, T2b and T2c, the first two being sensitive to proton irradiation. At 1% agarose concentration, the relaxation rates R1 = 1/T1, R2a = 1/T2a and R2b = 1/T2b of samples irradiated with both modulated and unmodulated beams, increase with the dose, irrespective of the beam energy. The yield G of Fe3+ ions per 100 eV of absorbed energy is always higher than that obtained for gamma irradiated samples.

Ferrous Compounds↗
PubMed1997

Alanine dosimetry of proton therapy beams.

An analysis of some of the properties of the ESR-alanine dosimetry in therapeutic proton beams is reported. Thin alanine-based detectors (1 and 2 mm thick pellets and 0.25 mm thick films) were tested in a clinical 62 MeV proton beam. The response of the alanine detectors in unmodulated and modulated proton beams was studied in tissue equivalent phantoms. The dose assessed by alanine was compared to the dose provided by a Markus parallel plate ionization chamber, used for reference dosimetry. Experiments in the 5-250 Gy dose range showed linearity of alanine dose response and no significant differences in the alanine response per unit dose to gammas and protons. Agreement within the experimental uncertainties was found between the alanine and the Markus chamber depth dose curves, including the Bragg peak region.

Alanine↗
PubMed1996

Cobalt-60 treatment of choroidal hemangiomas.

PURPOSE: We investigated the therapeutic possibilities of gamma brachytherapy to improve the final functional results of eyes with choroidal hemangiomas, which are benign vascular tumors that can induce progressive impairment of visual acuity. METHODS: We treated 41 patients with choroidal hemangioma with cobalt-60 applicators. The lesions consisted of 39 circumscribed hemangiomas and two diffuse hemangiomas in patients with Sturge-Weber syndrome. Before treatment, visual acuity in the affected eye was 20/200 in ten patients, 20/200 to 20/50 in 17 patients, 20/40 to 20/25 in 11 patients, and 20/20 in three patients. All patients were symptomatic. The macula was infiltrated by the tumor in 12 eyes (29.3%). There was retinal detachment in 40 eyes (97.6%), cystoid edema in ten eyes (24.4%), subretinal fibrosis in eight eyes (19.5%), and areolar atrophy in two eyes (4.9%). RESULTS: After treatment, the retina was reattached in all eyes, and the tumor progressively transformed into a flat scar. The postirradiation macular lesions that we identified were pigment migrations in the macular region, subretinal fibrosis, and an areolar atrophic scar. We correlated the functional results at two, five, and ten years after treatment with the initial visual acuity, and with pre-existing and posttreatment macular lesions. CONCLUSIONS: Our results suggest that radiotherapy is a valuable therapeutic modality for choroidal hemangiomas, particularly in hemangiomas that involve the macula, and for tumors associated with bullous retinal detachment.

Adolescent↗
PubMed1996

[Contribution of ultrasound biomicroscopy to conservative treatment of anterior uveal melanoma].

BACKGROUND: Ultrasound Biomicroscopy (UBM) is a new ophthalmological imaging technique essentially designed for the study of the anterior eye segment. Over the last 10 months, we've evaluated its contribution to the conservative treatment of anterior uveal melanoma's by means of accelerated proton beam irradiation. MATERIAL: Using UBM, we have examined 55 cases of uveal melanoma's, whose anterior border was situated at 6 mm or less from the limbus and that were consequently treated by proton beam irradiation. RESULTS: The presumed tumoral origin was the ciliary body's pars plicata in 13 cases and the pars plana or the choroid in 42 cases, 17 of which presented a tumoral invasion of the pars plicata. A pars plana detachment anterior to or surrounding the anterior tumoral border, was present in 22 cases. The height of the tumor could only be measured by UBM if it was less than 2.5 mm. Information gathered using UBM have contributed to an improvement of the therapy plan in 32 cases. CONCLUSION: Because of the strong attenuation of the high frequency ultrasound signal, UBM can only be used for the examination of intra-ocular structures situated in direct neighbourhood to the global wall. Despite this technical limitation, ist contribution to the planning of the conservative treatment of anterior uveal melanoma's by proton beam irradiation has appeared to be considerable.

Choroid Neoplasms↗
PubMed1995

[Familial uveal melanoma].

BACKGROUND: Familial uveal melanoma are rare and a few number of cases has been described in literature until now. An autosomal dominant inheritance was proposed. MATERIAL AND METHOD: From the 2169 patients examined and/or treated in the Jules Gonin Hospital for an uveal melanoma from 1969, we identified 11 patients from 9 families in which at least two members were affected. We compared the clinical data of the familial melanoma with those of the sporadic cases of our collective with the Kruskal-Wallis Tests. The following parameters were studied: age and sex of patients, largest and smallest tumor diameter, height and volume of tumor, distance between tumor and optic nerve and macula, distance of tumor to the equator. Age and sex were also compared with literature. RESULTS: Among the 11 patients, nine were treated with an accelerated proton beam, one with Cobalt60 applicator and one has been enucleated. The median age was 58 years among the probands and 54.6 years among the sporadic cases of the collective. Sex ratio is superposable between both groups: male 45.5%, female 54.5% among the probands and male 48.6%, female 51.4% among the sporadic cases. The comparison between both groups with the Kruskal-Wallis Tests did not show any significant statistical difference. CONCLUSION: An uveal melanoma occurring at least in two members of the same family is not due to chance alone. Genetic factors associated to external factors are probably responsable.

Adolescent↗