The prognostic value of the wuerzburg bleb classification score for the outcome of trabeculectomy

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Original Paper

Ophthalmologica

Ophthalmologica 2011;225:55–60 DOI: 10.1159/000314717

Received: October 23, 2009 Accepted after revision: April 2, 2010 Published online: August 14, 2010

The Prognostic Value of the Wuerzburg Bleb Classification Score for the Outcome of Trabeculectomy Thomas Klink Gunda Kann Patrick Ellinger Janine Klink Franz Grehn Rainer Guthoff Department of Ophthalmology, Julius Maximilian University, Wuerzburg, Germany

Key Words Bleb grading ⴢ Bleb classification ⴢ Glaucoma surgery ⴢ Filtering bleb ⴢ Trabeculectomy

Abstract Background: The Wuerzburg bleb classification score (WBCS) aims at an objective and standardized assessment of the developing filtering bleb after trabeculectomy, in order to detect and treat bleb scarring at the earliest possible stage of development. The purpose of this retrospective study was to evaluate the prognostic value of the early postoperative WBCS for the long-term outcome of trabeculectomy. Methods: The WBCS is a grading system for clinical bleb morphology. It evaluates the following parameters: vascularization, corkscrew vessels, encapsulation and microcysts. The WBCS of 113 eyes of 113 consecutive patients after trabeculectomy was determined 1 day, 1 and 2 weeks, 3, 6 and 12 months after surgery. Complete success was defined as an intra-ocular pressure (IOP) !21 mm Hg and 120% pressure reduction without glaucoma medication after 1 year. Results: A complete success rate of 73.9% and a qualified success rate of 82.4% were achieved 1 year after surgery. The average total bleb score during follow-up in the success group was always higher than in the failure group, but there was no statistically significant difference at any time. The bleb average

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score for eyes with an IOP of ^12 mm Hg after 2 weeks was significantly higher (p = 0.005) than for eyes with an IOP 613 mm Hg at the end of follow-up. Conclusion: Patients with a higher early WBCS postoperatively had a significantly lower IOP 1 year after surgery. However, the study could not reveal a certain prognostic value of the early total bleb score using the WBCS for the long-term complete success of trabeculectomy. Copyright © 2010 S. Karger AG, Basel

Introduction

Scarring of the filtering bleb is the main reason for failure of penetrating glaucoma surgery. Postoperative application of wound-modulating drugs is meanwhile routinely included in postsurgical management and has led to an increase in success rates after filtering procedures [1, 2]. In clinical practice, thorough slit-lamp examination is essential to assess filtering bleb development in order to start wound modulation when needed. Several scoring systems offer a framework for structured patient examination and facilitate the interpretation of clinical findings [3–6]. The Wuerzburg bleb classification score (WBCS) aims at an objective and standardized assessment of the developing filtering bleb after trabeculecPriv.-Doz. Dr. Thomas Klink Universitäts-Augenklinik Würzburg, Josef-Schneider-Strasse 11 DE–97080 Würzburg (Germany) Tel. +49 931 201 20610, Fax +49 931 201 20490 E-Mail klink_t @ klinik.uni-wuerzburg.de


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