Non-pupillary block angle-closure mechanisms: A comprehensive analysis of their prevalence and treatment outcomes

Daniela L.M. Junqueira, Vitor G. Prado, Flavio S. Lopes, Luis Gustavo Biteli, Syril Dorairaj, Tiago S. Prata

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Purpose: To assess the prevalence and treatment outcomes of angle-closure mechanisms other than pupillary block in a population of Brazilian patients. Methods: A retrospective chart review was conducted to evaluate patients who had undergone laser peripheral iridotomy (LPI) due to occludable angles at a single institution between July 2009 and April 2012. An occludable angle was defined as an eye in which the posterior trabecular meshwork was not visible for =180° on dark-room gonioscopy. Key exclusion criteria were any form of secondary glaucoma and the presence of < 90° of peripheral anterior synechiae. Collected data were age, race, gender, angle-closure mechanism (based on indentation goniocopy and ultrasound biomicroscopy), intraocular pressure (IOP), number of antiglaucoma medications and subsequent management during follow-up. If both eyes were eligible, the right eye was arbitrarily selected for analysis. Results: A total of 196 eyes of 196 consecutive patients (mean age 58.3 ± 11.6 years) who underwent LPI were included. In most of the patients [86% (169 patients; 133 women and 36 men]), LPI sucessfully opened the angle. Mean IOP was reduced from 18.3 ± 6.4 mmHg to 15.4 ± 4.5 mmHg after LPI (p<0.01). Among the 27 patients with persistent occludable angles, the most common underlying mechanisms were plateau iris (56%) and lens-induced component (34%). Most of these patients (85%) were treated with argon laser peripheral iridoplasty (ALPI); approximately 90% showed non-occludable angles following the laser procedure (mean IOP reduction of 18.9%), with no significant differences between patients with plateau iris and lens-induced components (p=0.34; mean follow-up of 11.4 ± 3.6 months). Conclusions: Our findings suggest that, in this population of Brazilian patients, several eyes with angle closure were not completely treated with LPI. In the present large case series involving middle-age patients, plateau iris was the leading cause of persistent angle closure and was effectively treated with ALPI. A detailed eye examination with indentation gonioscopy should always be performed after LPI to rule out persistent angle closure due to non-pupillary block mechanisms.

Original languageEnglish (US)
Pages (from-to)360-363
Number of pages4
JournalArquivos Brasileiros de Oftalmologia
Volume77
Issue number6
DOIs
StatePublished - Jan 1 2014

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Lasers
Iris
Intraocular Pressure
Gonioscopy
Argon
Lenses
Acoustic Microscopy
Trabecular Meshwork
Glaucoma
Population

Keywords

  • Angle closure
  • Iridectomy
  • Iris diseases
  • Iris/pathology
  • Non-pupillary block mechanisms
  • Treatment outcome

ASJC Scopus subject areas

  • Ophthalmology

Cite this

Non-pupillary block angle-closure mechanisms : A comprehensive analysis of their prevalence and treatment outcomes. / Junqueira, Daniela L.M.; Prado, Vitor G.; Lopes, Flavio S.; Biteli, Luis Gustavo; Dorairaj, Syril; Prata, Tiago S.

In: Arquivos Brasileiros de Oftalmologia, Vol. 77, No. 6, 01.01.2014, p. 360-363.

Research output: Contribution to journalArticle

Junqueira, Daniela L.M. ; Prado, Vitor G. ; Lopes, Flavio S. ; Biteli, Luis Gustavo ; Dorairaj, Syril ; Prata, Tiago S. / Non-pupillary block angle-closure mechanisms : A comprehensive analysis of their prevalence and treatment outcomes. In: Arquivos Brasileiros de Oftalmologia. 2014 ; Vol. 77, No. 6. pp. 360-363.
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