Experimentally designed glaucoma implant surgery with mitomycin C in rabbit.
An attempt was made to observe the possibility of controlling intraocular pressure (IOP) without hypotony and ocular motility disorder by installing an experimentally designed glaucoma implant through a small conjunctival incision with the aid of a stylet and maintaining the aqueous reservoir using mitomycin C (MMC). The implant was made of silicone tube, of which one end was occluded by glue and on the same end 4 check-valve-like slits were made. Thirty-five healthy white rabbits were used and subdivided into 4 groups. In groups I to III, implants having 2.0, 2.5, 3.0 mm slit lengths, respectively, were installed with MMC application in one eye of each of the 10 rabbits. In group IV, a 2 mm slit-length implant was installed without MMC in one eye of each of the 5 rabbits. Pneumatonometry and ultrasonography were performed to check the IOP and the formation of aqueous reservoir in the implanted eyes for 8 weeks. In group I through III, there was a statistically significant 4-5 mmHg pressure-lowering effect in the implanted eyes compared to the contralateral control eyes for 8 weeks. The aqueous reservoirs were observed throughout the follow-up period. In group IV, we could observe neither a pressure-lowering effect nor aqueous reservoir formation in the implanted eyes after 2 weeks postoperatively. Hypotony did not occur in implanted eyes in any of the groups. This study shows the possibility of IOP control by installing a specially designed glaucoma implant with application of MMC.
Kee
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Department of Ophthalmology, Samsung Medical Center, Seoul, Korea.
Youn
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D000818:Animals; D000869:Anterior Eye Segment / Q000000981:diagnostic imaging; D000903:Antibiotics, Antineoplastic / Q000627:therapeutic use*; D001082:Aqueous Humor / Q000378:metabolism; D017024:Chemotherapy, Adjuvant; D005901:Glaucoma / Q000628:therapy*; D007429:Intraocular Pressure; D016685:Mitomycin / Q000627:therapeutic use*; D015814:Ocular Hypotension / Q000517:prevention & control; D015835:Ocular Motility Disorders / Q000517:prevention & control; D019736:Prostheses and Implants; D011817:Rabbits; D012826:Silicone Elastomers; D014065:Tonometry, Ocular; D014463:Ultrasonography
D000903:Antibiotics, Antineoplastic; D012826:Silicone Elastomers; D016685:Mitomycin