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Biomedical subjects

R Diaz-Rohena

Publications and source records attributed to R Diaz-Rohena.

8 recordsLinked to original sources
PubMed1996

Use of perfluorocarbon liquid in the repair of retinoschisis retinal detachments.

BACKGROUND AND OBJECTIVES: To determine the effectiveness of perfluorocarbon liquid in the repair of retinoschisis-associated retinal detachments. PATIENTS AND METHODS: Four patients with either degenerative or juvenile X-linked retinoschisis had rhegmatogenous retinal detachments that were repaired with the use of perfluorocarbon liquid during vitrectomy. The patients' ages ranged from 17 to 78 years and the postoperative follow-up was at least 6 months. RESULTS: All of the patients had complete anatomic repair of the retinoschisis-associated retinal detachments. The postoperative visual acuity was 20/200 or better in all of the patients and 20/40 or better in half of the patients. CONCLUSIONS: The use of perfluorocarbon liquid is an effective adjunct in the management of rhegmatogenous retinal detachments associated with degenerative and juvenile X-linked retinoschisis.

Adolescent↗
PubMed1995

Current management of proliferative vitreoretinopathy.

The recognition of APVR and its dissection, along with the use of perfluorocarbon liquids, has greatly improved the success rate in surgery for severe PVR. In reviewing our first 71 cases using these techniques, 75% were attached with one operation and 90% were attached with one or more operations. These techniques have greatly improved our operative results and have obviated the use of retinal tacks and suturing, retinotomy (in most cases), and the need for very high scleral buckles. (We rarely alter an in-place scleral buckle.)

Fluorocarbons↗
PubMed1993

Diode-laser photocoagulation for zone 1 threshold retinopathy of prematurity.

We used the diode-laser indirect ophthalmoscope in the treatment of 17 (30 eyes) infants with zone 1 (a circle centered on the optic disk with a radius of twice the distance from the disk to the fovea) threshold retinopathy of prematurity (at least five continuous or eight cumulative 30-degree sectors [clock hours] of ridge with extraretinal fibrovascular proliferation in the presence of plus disease). Mean follow-up was 31.2 weeks. Two eyes (6.7%) required retreatment of missed areas that had persistent plus disease (enlarged posterior veins and tortuous arterioles). A favorable outcome was attained in 25 eyes (83.3%). Five eyes (16.7%) developed retinal detachments, three of which remained stable at Stage 4A (extrafoveal retinal detachment) and two of which ultimately progressed to Stage 5 (total retinal detachment). Both eyes that went on to Stage 5 had severe posterior pole hemorrhages at the time of treatment. Two eyes that developed retinal detachments (one, stage 4A and one, stage 5) had rhegmatogenous components. Among 14 infants followed up for more than three months, four developed nystagmus, and six developed strabismus. In contrast to cryoablation, diode-laser photoablation of the peripheral retina was found to be an effective treatment for threshold retinopathy of prematurity located in zone 1. Portability and ease of use of the laser system, precision of treatment, and minimal postprocedural adnexal inflammation are further advantages of this therapeutic modality.

Female↗
PubMedDate not supplied

A historical review of sympathetic ophthalmia and its epidemiology.

Sympathetic ophthalmia was given its complete clinical description by William Mackenzic in 1840, and fully described in terms of its histopathology by Ernst Fuchs in 1905. A review of epidemiologic data from the 19th and 20th centuries reveals that acceptable statistical studies have yet to be carried out, but suggests that the disease has always been of extremely low incidence. Further, there does not appear to be a markedly decreased incidence in the "modern era." The etiology of the disease remains elusive, although the pathogenesis appears to be due to delayed hypersensitivity (cell-mediated immunity), possibly directed at a surface membrane antigen that is shared by photoreceptors, retinal pigment epithelium and choroidal melanocytes. The only effective therapy remains preventive enucleation of the injured eye, despite modern usage of immunosuppressive agents. Studies have suggested that early enucleation of a blind exciting eye can improve the prognosis for the sympathizing eye.

Antigens, Surface↗
PubMedDate not supplied

Perfluoro-N-octane (PFO) in the repair of complicated retinal detachments due to severe proliferative diabetic retinopathy.

PURPOSE: To report our experience with perfluoro-N-octane (PFO) in the surgical management of complicated retinal detachments due to proliferative diabetic retinopathy. METHODS: Retrospective review of 18 consecutive eyes of 18 patients with tractional or combined tractional and rhegmatogenous retinal detachments due to severe proliferative diabetic retinopathy managed by pars plana vitrectomy and the intraoperative use of PFO. Preoperative characteristics, intraoperative findings and procedures and postoperative results were recorded. RESULTS: The mean preoperative acuity was 2/200 (range, 20/25 to light perception). The mean final visual acuity was 4/200 (range, 20/20 to no light perception). With a mean follow-up of 6 months, there was an 89% anatomic reattachment rate at the last visit and visual acuity was stable or improved in 72% of eyes. CONCLUSIONS: In our experience, PFO is a helpful surgical adjunct in the anatomic reattachment of tractional or combined tractional and rhegmatogenous diabetic retinal detachments. Visual acuity was stabilized or improved in the majority of eyes.

Adult↗