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Titolo:
Evaluation of retinal functional loss in branch retinal vein occlusion
Autore:
Barbazetto, IA; Schmidt-Erfurth, UM;
Indirizzi:
Univ Lubeck, Klin Augenheilkunde, D-23538 Lubeck, Germany Univ Lubeck Lubeck Germany D-23538 genheilkunde, D-23538 Lubeck, Germany
Titolo Testata:
OPHTHALMOLOGE
fascicolo: 3, volume: 96, anno: 1999,
pagine: 159 - 165
SICI:
0941-293X(199903)96:3<159:EORFLI>2.0.ZU;2-E
Fonte:
ISI
Lingua:
GER
Soggetto:
LASER PHOTOCOAGULATION; MACULAR EDEMA;
Keywords:
branch retinal vein occlusion; scanning laser ophthalmoscopy; laser treatment;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Barbazetto, IA Univrmanyck, Klin Augenheilkunde, Ratzeburger Allee 160, D-23538 Lubeck, Ge Univ Lubeck Ratzeburger Allee 160 Lubeck Germany D-23538 e
Citazione:
I.A. Barbazetto e U.M. Schmidt-Erfurth, "Evaluation of retinal functional loss in branch retinal vein occlusion", OPHTHALMOLO, 96(3), 1999, pp. 159-165

Abstract

Purpose: Branch retinal Vein occlusion (BRVO) induces variable functional deficits depending on the grade of vascular occlusion and its localisation. Theses deficiences are not easily defined by Visual acuity measurements. However, microperimetry offers topical mapping of retinal function, allowingprecise documentation of the intensity and dimension of retinal functionalloss in BRVO. Methods: Retinal sensitivity was examined using a Rodenstock Scanning laser Ophthalmoscope (SLO). A standardized grading system of stimuli ranging from 0 to 32 dB was used to document the retinal threshold in three differentareas: regions presenting vascular occlusion, the collateral edematous zone and adjacent areas with intact perfusion. Absolute and relative scotomas as well as the fixation behavior were studied. Results: Forty-two patients with isolated BRVO within the vascular arcadeswere examined with microperimetry and angiography. At initial presentationwith BRVO the retinal sensitivity in the area of occlusion on average diminished to 4.1 dB. In the collateral edematous zone retinal threshold was reduced to 21.5 dB; areas with intact perfusion demonstrated a threshold of 23.2 dB. Within the occluded area itself defects of significantly differing intensity were found which only partially correlated with the angiographic evidence. Intense scotomas (0 dB) were observed in 59 % of the eyes examined: angiographically nonperfused areas or extended intraretinal hemorrhage were present. Relative scotomas (12.1 dB) were seen in 19.1 % and minimal, non-significant defects (19.5 dB) were documented in 21.4 % of the BRVO. Thelevel of angiographically documented leakage did not correlate with the functional deficits present in these two groups. Measurements performed after6-8 weeks revealed noticeable spontaneous recovery of retinal sensitivity,unless an additional progressive closure occurred. The average functional improvement in the area of leakage found after laser therapy was less than the results shown in spontaneous resolution of edema. Conclusions: BRVO may lead to significant reductions of central and paracentral retinal function. Angiographically observed leakage is not always directly correlated to the magnitude of retinal sensitivity loss. As spontenous remission is frequent in one group and intact retinal function can be shown in areas of angiographic leakage,therapeutic interventions, e.g. laser treatment, should be carefully considered. Scanning laser ophthalmoscopy provides additional information for precise evaluation and follow-up of the retinal damage in BRVO.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 01:32:00