Elsevier

Ophthalmology

Volume 115, Issue 7, July 2008, Pages 1154-1161.e4
Ophthalmology

Original article
Filtering Blebs and Aqueous Pathway: An Immunocytological and In Vivo Confocal Microscopy Study

Presented in part as a poster at: Association for Research in Vision and Ophthalmology annual meeting, May 2005, Fort Lauderdale, Florida.
https://doi.org/10.1016/j.ophtha.2007.10.024Get rights and content

Objective

To characterize and understand, at the cellular level, the aqueous humor pathways after filtering surgery, using in vivo confocal microscopy and impression cytology (IC).

Design

Observational case series.

Participants

Thirty-two blebs of 29 patients after trabeculectomy were retrospectively evaluated.

Methods

In vivo confocal microscopy and immunofluorescence staining of IC samples taken on and around the bleb area were performed. Impression cytology samples were examined under confocal microscopy after goblet cell and inflammatory cell immunostaining with anti-MUC5AC and antivimentin antibodies, respectively. Eyes were classified into 3 groups: (1) functioning blebs (11 eyes), (2) nonfunctioning blebs (10 eyes), and (3) functioning blebs after mitomycin C application (12 eyes). Impression cytology specimens and in vivo confocal microscopy images were analyzed and compared in a masked manner.

Main Outcome Measures

Conjunctival epithelium changes of each type of bleb were analyzed using both impression cytology specimens and in vivo confocal microscopy and correlated to clinical outcomes.

Results

In all IC specimens, numerous MUC5AC-positive cells were observed outside the edges of the blebs. Few MUC5AC-positive cells were observed at the surface of nonfunctioning blebs. Numerous goblet cells with immunostaining that was weak or limited to the membrane were clearly visible morphologically at the surface of functioning blebs (with and without adjunctive mitomycin C). Using in vivo confocal microscopy, all functioning blebs showed numerous intraepithelial optically empty microcysts, whereas nonfunctioning blebs had none or only a few. All blebs contained dendritiform inflammatory cells, especially after mitomycin C application.

Conclusion

Impression cytology and in vivo confocal microscopy provide a new approach to filtering blebs. Microcysts observed at the surface of functioning blebs seemed to correspond to goblet cells, mostly containing aqueous humor instead of highly hydrophilic gel-forming mucins. Although this hypothesis requires further confirmation, the transcellular pathway of the aqueous humor could be hypothesized to occur at the level of goblet cells toward the ocular surface.

Section snippets

Patients and Methods

In this study, 33 eyes of 29 patients who had previously undergone trabeculectomy were included. They were evaluated and followed up at the Quinze-Vingts National Ophthalmology Hospital, Paris, France. All patients had chronic open-angle glaucoma. Twelve were female and 17 were male, and age ranged from 47 to 83 years (mean ± standard deviation [SD], 66.15±10.48).

Trabeculectomy was performed by 2 of the department's surgeons. After meticulous cauterization of the sclera, a half-thickness

Results

In vivo confocal microscopy examination of functioning blebs showed several distinct characteristics. Conjunctival epithelial cells had a normal appearance. Scattered throughout a normal conjunctival epithelium, numerous optically clear spaces filled with fluid were seen, most likely corresponding to the microcysts observed with the slit lamp and consistent with our previous findings using the same confocal microscopy technique. Outside the bleb area, the conjunctival epithelium was quite

Discussion

Several studies have characterized the histopathology of the bleb conjunctival epithelium. It was stated that under optical and electronic microscopy the epithelium of functioning and failed blebs seemed to be normal.10 The conjunctival epithelium was described as irregular in thickness, containing numerous intraepithelial microcysts in blebs with adjunctive mitomycin C.25 Conjunctival epithelial spongiosis associated with inflammatory changes was reported,26 with focally acantholytic

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    Manuscript no. 2007-169.

    Supported by Quinze-Vingts National Ophthalmology Hospital.

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