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Influence of non-penetrating glaucoma surgery on aqueous outflow facility in isolated porcine eyes

¹ Memorial Research Institute of Ophthalmology, Giza, Egypt
² University Eye Hospital, Basel, Switzerland
³ Jules Gonin Eye Hospital, University of Lausanne, Switzerland

Correspondence to:
Correspondence to:
Dr T Shaarawy
Glaucoma Surgery Research Group, University of Basel, Switzerland; shaarawy{at}glaucoma-surgery.com

ABSTRACT
Purpose: To investigate, in vitro, the influence of non-penetrating glaucoma surgery (NPGS) and the influence of tightly suturing the superficial scleral flap on the aqueous outflow facility of isolated porcine eyes.

Materials and methods: The anterior chambers of 12 enucleated porcine cadaver eyes were cannulated and perfused. NPGS was performed by the same surgeon. The overall ocular aqueous outflow facilities were assessed before and after the surgical interventions of NPGS, as well as after scleral flap closure.

Results: The mean (SD) aqueous outflow facility, which was 0.164 (0.014) µl/min/mm Hg before surgery, increased significantly after NPGS to 1.584 (0.217) µl/min/mm Hg, p<0.001. When the superficial flap was closed, the aqueous outflow facility significantly decreased (0.754 (0.107) µl/min/mm Hg, p<0.001) but remained significantly higher than preoperatively (p<0.01). After suturing the superficial flap, the overall resistance increased to 1.625 (0.210) µl/min/mm Hg. The difference in the resistance to outflow before and after flap closure was 0.848 (0.169) µl/min/mm Hg.

Conclusion: After NPGS suturing the scleral flap can modulate aqueous outflow resistance. The experimental set up described might provide an efficient model for the technical training of glaucoma surgeries.

Abbreviations: DS, deep sclerectomy; IOP, intraocular pressure; NPGS, non-penetrating glaucoma surgery; TDM, trabeculo-Descemet’s membrane

Keywords: aqueous; deep sclerectomy; glaucoma surgery; non-penetrating; viscocanalostomy

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