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Comparison of the corneal endothelial cell protection effect between the soft shell technique and the use of medium molecular cohesive hyaluronic acid viscoelastic materials Sayaka Wada 1 , Kimi Endo 1 , Takaya Kikuchi 1 , Yuki Kisanuki 1 , Eiko Miura 1 , Mina Tsukagoshi 1 , Makoto Zenno 1 , Takahiro Usui 1 1Department of Ophthalmology, Showa University Northern Yokohama Hospital pp.489-494
Published Date 2022/4/15
DOI https://doi.org/10.11477/mf.1410214352

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Abstract Objective:We compared the soft-shell technique by a dispersive viscoelastic substance and a cohesive one, and the use of medium molecular cohesive viscoelastic substance alone on corneal endothelial protection during phacoemulsification.

Subjects and Methods:This study included 354 eyes that received cataract surgery at Showa University Northern Yokohama Hospital from April 2020 to March 2021, excluding cases of Emery-Little grade 4, corneal endothelial cell reduction, and those associated with intraoperative complications. Three skilled surgeons performed phacoemulsification through a corneal incision, using the soft-shell technique in 130 eyes and using only a medium-molecular cohesive viscoelastic substance in 224 eyes(hereafter referred to as the medium-molecular alone group). We measured the rate of corneal endothelial cell loss preoperatively and two months postoperatively, and the cumulative energy by phacoemulsification. Wilcoxon's rank sum test was used for comparison between the two groups.

Results:CDE values were significantly higher in the soft-shell group(p<0.0001). The rate of corneal endothelial cell loss was significantly higher in the medium-molecule alone group(p=0.0035). When examined by Emery-Little grade, the rate of corneal endothelial cell loss was significantly higher in the medium-molecule alone group with grade 3, but there was no significant difference with grade 2 or lower.

Conclusions:The soft-shell technique was more effective in protecting corneal endothelial cells than with the use of medium molecular cohesive viscoelastic substance alone, in cases with high nuclear sclerosis. We suggest that the soft-shell technique may not be required, in cases with mild nuclear sclerosis.


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電子版ISSN 1882-1308 印刷版ISSN 0370-5579 医学書院

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