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Abstract #19077 Published in IGR 3-1
Long-term results of eyes with penetrating keratoplasty and glaucoma drainage tube implant
Kwon YH; Taylor JM; Hong S; Honkanen RA; Zimmerman MB; Alward WLM; Sutphin JEOphthalmology 2001; 108: 272-278
PURPOSE: To present long-term results of eyes with penetrating keratoplasty (PK) and glaucoma tube implant. DESIGN: Retrospective, noncomparative, interventional case series. PARTICIPANTS: The authors retrospectively reviewed medical records of all patients who underwent both PK and glaucoma tube implant (Baerveldt or Ahmed) at the University of Iowa between July 1988 and December 1997 (55 eyes). METHODS: Success of the tube implant or PK was evaluated using Kaplan-Meier survival analysis. Association of relevant clinical factors with glaucoma or corneal graft outcome was evaluated using log-rank test or Cox proportional hazard regression analysis. The factors evaluated were glaucoma and cornea diagnoses; prior, simultaneous, and subsequent surgeries; type of tube implant; relative timing of surgeries; and postsurgical complications. MAIN OUTCOME MEASURES: Glaucoma outcome was assessed by postoperative intraocular pressure (IOP), number of medications, and need for further glaucoma surgery. Corneal outcome was assessed by graft rejection, failure, and Snellen visual acuity. Surgical procedures before and during the study period, and their complications were evaluated. RESULTS: The mean preoperative intraocular pressure was 29.8 mmHg with an average of 2.9 medications. At last postoperative follow-up, the mean IOP decreased to 14.3 mmHg with 0.7 medication. The tube implant successfully controlled glaucoma in 45 eyes (82%) at three years. More severe postsurgical complications were associated with greater glaucoma failure. Graft rejection occurred in 17 eyes, and seven of these progressed to failure. Nonimmunologic graft failure occurred in an additional 17 eyes (31%). The remaining 31 eyes (56%) had a clear graft. The corneal grafts remained clear in 70% and 55% of eyes at two and three years, respectively. Corneal graft failure was associated with glaucoma and cornea diagnoses groups, type of tube implant, and relative timing of the two surgeries. Complications occurred in 23 eyes (42%), and ten of these were serious. CONCLUSIONS: A drainage tube implant can successfully control glaucoma in a majority (82%) of keratoplasty eyes at three years. However, the success of corneal grafts is low (55%) at three years. Postsurgical complications are not uncommon and are associated with poor glaucoma outcome. Other clinical factors are associated with poor graft outcome.
Dr Y.H. Kwon, Department of Ophthalmology/Visual Sciences, Univ. of Iowa Hospitals and Clinics, 200 Hawkins Drive, Iowa City, IA 52242, USA
Classification:
9.4.11.4 Glaucomas associated with corneal surgery (Part of: 9 Clinical forms of glaucomas > 9.4 Glaucomas associated with other ocular and systemic disorders > 9.4.11 Glaucomas following intraocular surgery)