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Clinical evaluation of aqueous outflow system in vivo and correlation with intraocular pressure before and after non-penetrating glaucoma surgery

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Abstract

Purpose

The aim of this study was to evaluate the aqueous outflow system through channelography with fluorescein during non-penetrating glaucoma surgery (canaloplasty or phacocanaloplasty) and find correlations with preoperative and postoperative intraocular pressure (IOP).

Methods

Thirty-six patients (40 eyes) who had channelography while undergoing non-penetrating glaucoma surgery were included in this prospective study. Several parameters assessed during the channelography included: diffuse and superficial scleral staining, the number of visible superficial connections to collectors, trabecular permeability and number of micro-ruptures of the trabecular meshwork. IOP, the best-corrected visual acuity, the number of glaucoma medications was recorded at 1 day, 7 days, 3 months and 6 months after the operation.

Results

The change in IOP at 6 months from baseline significantly correlated with the number of visible superficial connections to collectors (r = 0.4, p = 0.021). Eyes with canaloplasty showed a mean baseline IOP of 19.4 (4.9) mmHg and mean glaucoma medication usage of 2.9 (1.0), which decreased to 13.2 (3.1) mmHg with 0.3 (0.8) medications, respectively, at 6 months postoperatively (p < 0.001). Eyes with phacocanaloplasty surgery showed a mean baseline IOP of 28.2 (9.6) mmHg with 2.6 (0.9) mean drugs, which decreased to IOP of 12.8 (3.4) mmHg with 0.5 (0.8) medications at 6 months (p < 0.001).

Conclusion

A larger number of defined visible superficial connections to collectors after injection of fluorescein into SC is related to a more pronounced IOP decrease after non-penetrating glaucoma surgery.

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Authors and Affiliations

  1. Department of Ophthalmology, Lithuanian University of Health Sciences, Kaunas, Lithuania

    Renata Vaiciuliene & Vytautas Jasinskas

  2. Department of Ophthalmology, University of Padua, Padua, Italy

    Norbert Körber

  3. Augencentrum, Cologne, Germany

    Norbert Körber

Authors
  1. Renata Vaiciuliene
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  2. Norbert Körber
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  3. Vytautas Jasinskas
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Correspondence to Renata Vaiciuliene.

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The authors declare that they have no conflict of interests.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study.

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Vaiciuliene, R., Körber, N. & Jasinskas, V. Clinical evaluation of aqueous outflow system in vivo and correlation with intraocular pressure before and after non-penetrating glaucoma surgery. Int Ophthalmol 38, 2141–2147 (2018). https://doi.org/10.1007/s10792-017-0715-z

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  • DOI: https://doi.org/10.1007/s10792-017-0715-z

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