Abstract
Abstract: :
Purpose: To investigate the adverse effects of irrigation fluid flow for both cryopexy and progress of bullous retinal detachment during vitrectomy. Also, we examined the effect of porous infusion cannula (8 pores) newly–designed for the purpose of scattering the irrigation fluid flow. Methods: Three pigmented rabbits were used in this study. After conventional pars plana lensectomy and vitrectomy, following two experiments were performed. (Experiment 1) The effect of using porous infusion cannula for the cryopexy was compared to the use of single–pore (conventional) infusion cannula by detecting the area where the cryopexy was impossible or difficult. (Experiment 2) The difference of development of bullous retinal detachment after creating intentional retinal break was compared between the use of single–pore and porous infusion cannula. Results: (Experiment 1) The cryopexy was inhibited by both using single–pore and porous infusion cannula depending on the retinal area. However, the area, where cryopexy was impossible, was larger when single–pore cannula was used. (Experiment 2) The bullous retinal detachment occurred by both using single–pore and porous infusion cannula. However, the speed of development of the bullous retinal detachment is faster when single–pore cannula was used. Similar results were obtained in all rabbits in both experiments.Conclusions: Irrigation fluid flow was proved to influence for both the cryopexy and progress of bullous retinal detachment during vitrectomy. Porous infusion cannula seemed to be more advantageous compared to a single–pore cannula by scattering the infusion water flow.
Keywords: retinal detachment • vitreoretinal surgery • retina