Search PubMed⌕ Search

Biomedical subjects

Y Tano

Publications and source records attributed to Y Tano.

At least 217 records · Page 12Linked to original sources
PubMed1987

Juvenile retinal detachment.

The features and prognoses of 802 cases (908 eyes) of retinal detachment from 8 months to 19 years of age were studied with the patients divided into three age groups: 65 eyes in group I (0-9), 259 eyes in group II (10-14), and 584 eyes in group III (15-19). Eyes in group I were different from the others in many respects. In group I, traumatic detachments, preoperative complications, four-quadrant detachments, and eyes with undetected breaks were more frequent, and the prognosis was worse than in the other groups. Holes with lattice degenerations were most frequent in group III eyes having no history of trauma. Group III resembled adult retinal detachment and group II was thought to be the transitional type.

Adolescent↗
PubMed1986

Corneal endothelial cell damage associated with intraocular gas tamponade during pars plana vitrectomy.

A prospective study was conducted of corneal endothelial damage associated with intraocular gas tamponade during pars plana vitrectomy performed in 44 patients. In addition to vitrectomy or combined vitrectomy-lensectomy, 25 patients (the gas-treated group) underwent intraocular gas tamponade, which was not performed in 19 patients (the control group). The central corneal endothelium was examined with a specular microscope preoperatively and 3 months postoperatively. Endothelial changes were quantitated by computerized morphometric analysis of individual cells. A total of 20 eyes were phakic after vitrectomy, 13 eyes in the gas-treated group and 7 eyes in the control group. The mean endothelial cell loss for the gas-treated group (1.9%) did not differ significantly from that for the control group (1.8%). Twenty-four eyes were aphakic after vitrectomy, 12 eyes in the gas-treated group and 12 eyes in the control group. The gas-treated group had a significantly greater cell loss (28.3%) than those in the control group (16.3%).

Air↗
PubMed1984

Scanning electron microscopy of vascular casts in experimental ocular vasoproliferation.

Scanning electron microscopy of vascular casts was used to investigate three experimental models of neovascularization. In each experimental situation, the casts provided a valuable three dimensional representation of the newly formed blood vessels and permitted subclassification of the vessels within normal and proliferating vascular networks. They defined also the predominant origin of new vessels from venules and capillaries, and enabled the evolution of proliferating vessels into arterioles and venules to be documented. Although vascular casts must be interpreted with caution in light of the possibility of incomplete filling and other artifacts, they are a valuable tool in the study of ocular vasoproliferation.

Animals↗
PubMed1984

Comparison of intraocular irrigating solutions used for pars plana vitrectomy and prevention of endothelial cell loss.

We performed a prospective study of corneal endothelial cell loss following pars plana vitrectomy. Two different intraocular irrigating solutions were used, and the anterior capsule of the lens was removed when performing lensectomy. The central corneal endothelium was photographed with a specular microscope before and at three months after vitrectomy. Endothelial cell loss was calculated using a computer-assisted digitizer. In the 16 aphakic eyes, lactated Ringer's solution caused a significantly greater cell loss (31.1%) with resultant corneal edema when compared to BSS Plus (6.9%). All of the 17 phakic eyes showed minimal cell loss (1.0%) as well as corneal changes regardless of the kind of irrigating solution used. The results suggest that the absence of the lens is a salient factor in corneal endothelial damage during vitrectomy, and that the composition of the intraocular solution used is closely related to this endothelial damage.

Acetates↗
PubMed1982

[Auscultation].

Explore the source record for details and available documents.

Auscultation↗
PubMed1982

[Study on administration method of dibekacin].

The serum concentration of dibekacin (DKB) were determined in 4 healthy adult volunteers after intramuscular injection, intravenous injection and 1-hour or 2-hour intravenous drip infusion of 100 mg of DKB, and 1-hour drip infusion of 50 mg. The mean peak concentration after the 2-hour drip infusion of 100 mg of DKB was a rather low level. While the 1-hour drip infusion of 50 mg of DKB produced a peak concentration of 7.9 micrograms/ml, which is comparable to that after intramuscular injection of 100 mg. In the cases of the 1-hour drip infusion of 100 mg, the peak serum level reached 13.3 micrograms/ml, which is a relatively higher level than that after intramuscular injection of the same dose. Based on the above findings, it is suggested that the 1-hour intravenous drip infusion of DKB in doses of 50 mg to 100 mg be practically applied for therapeutic use.

Adult↗
PubMed1981

The lack of toxicity of intravitreally administered triamcinolone acetonide.

We gave one eye of each 21 rabbits an intravitreal injection of 1 mg of triamcinolone acetonide; the other eye received an injection of an equal volume of saline solution as a control. Results of slit-lamp examinations, ophthalmoscopy, intraocular pressure, electroretinography, and light electron microscopy all remained normal throughout the three-month course of the experiment, demonstrating the lack of ocular toxicity of triamcinolone acetonide in the rabbit.

Animals↗
PubMed1981

Glucocorticosteroid inhibition of intraocular proliferation after injury.

Perforating injuries were produced in the posterior segment of rabbit eyes. We studied the inhibitory effect of a slowly water-soluble corticosteroid, dexamethasone alcohol, on fibroblast growth. The treated group received a single intravitreal injection of 1 mg of the corticosteroid. The eyes were observed for four weeks. Transvitreal proliferation was significantly decreased and wound healing was delayed as compared to a control group. Inhibition of intraocular proliferation by high doses of intravitreally injected corticosteroid may be useful in the treatment of eyes with penetrating and perforating injuries.

Animals↗
PubMed1981

Simulation of massive periretinal proliferation by autotransplantation of retinal pigment epithelial cells in rabbits.

We compared the clinical pattern, the histologic findings, and the electron microscopic appearance of lesions produced by the autotransplantation into rabbit vitreous of freshly harvested and tissue-cultured (250,000) retinal pigment epithelial cells. Both harvested and cultured cells formed intravitreal strands, traction detachments, and retinal puckers, resembling the most prominent features of massive periretinal proliferation in humans. Strands produced by both types of retinal pigment epithelial cells contained cells resembling myofibroblasts which may explain the contractability of the strand. The clinical, histologic, and electron microscopic observations were similar to those found in eyes injected with tissue-cultured skin fibroblasts.

Animals↗
PubMed1981

Retinal neovascularization after intravitreal fibroblast injection.

We have developed a new model of retinal neovascularization in the rabbit. After intravitreal autotransplantation of 250,000 tissue-cultured skin fibroblasts, we observed strand formation in the midvitreous cavity. These strands grew toward the vascularized part of the retina and attached to it. Once the attachment was established, retinal neovascularization began with growth of vessels along the fibrous strand. After three months, this retinal neovascularization regressed. The presence of immature capillaries was confirmed by electron microscopic examination. Of 43 eyes, 31 (72%) developed neovascularization.

Animals↗
PubMed1981

Vascular casts of experimental retinal neovascularization.

Autotransplantation of skin fibroblasts into the vitreous cavity of the rabbit eye resulted in the formation of fibrous strands that rapidly vascularized. To study this neovascularization, we injected methylmethacrylate monomer via the common carotid artery and made plastic casts between three days and three months after transplantation. Budding of new vessels into the fibrous tissue from retinal veins was observed as soon as three days after transplantation. The new vessels grew rapidly into the fibrous tissue matrix and an increasing number of anastomoses developed during the observation period. Neovascular fans developed at the proximal end of the proliferating fibrous tissue two to four weeks after injection. As the strands contracted, changes in blood flow resulted in aneurysmal dilatations and glomerular formations.

Animals↗
PubMed1980

Intravitreal autotransplantation of fibroblasts.

Tissue cultured skin fibroblasts autotransplanted into the vitreous cavity of rabbit eyes formed intravitreal strands that grew toward the medullary ray and optic nerve head and caused preretinal puckers and traction detachment. After four weeks, 32 of 51 eyes (63%) developed these changes. Light and electron microscopy revealed initial cell death. Remaining cells aligned themselves quickly into strands and began to multiply as shown by tritiated thymidine methyl incorporation. The appearance of cells that resemble myofibroblasts may explain the contractability of the strand. Because the effect of intraocular proliferation can be quantitated by the number of puckers and retinal detachments developing, this model may be useful for the study of therapeutic means to reduce intraocular proliferation.

Animals↗
PubMed1980

Inhibition of intraocular proliferations with intravitreal corticosteroids.

Autotransplantation of one fourth million tissue cultured fibroblasts from rabbit rump skin into the vitreous cavity resulted in intravitreal strand formation and traction retinal detachment (27 of 47 eyes, 57%). A single intravitreal injection of 1 mg of dexamethasone alcohol inhibited fibroblast growth as judged by the significantly reduced number of retinal detachments (11 of 46 eyes, 24%). Retinal neovascularization that was observed when fibrous strands came into contact with vascularized retina (nine of 47 eyes, 19%) was also inhibited after corticosteroid application (two of 46 eyes, 4%).

Animals↗
PubMed1980

Treatment of intraocular proliferation with intravitreal injection of triamcinolone acetonide.

We studied the inhibitory effect of triamcinolone acetonide on experimental intraocular proliferation. Autotransplantation of fibroblasts from rabbit rump skin into the vitreous cavity resulted in intravitreal strand formation and traction retinal detachment in 36 of 43 eyes (84%) over a period of three months. A single intravitreal injection of 1 mg of triamcinolone acetonide inhibited fibroblast growth and significantly reduced the number of retinal detachments in 15 of 44 eyes (34%). Retinal neovascularization caused by fibrous strands coming into contact with vacularized retina was also reduced by triamcinolone acetonide (31 of 43 control eyes [72%] vs eight of 44 treated eyes [18%]). Intravitreal corticosteroid therapy may be an important adjunct to the therapy of perforating injuries and massive periretinal proliferation.

Animals↗