Purpose. To describe the technique, outcomes, and complication rates for a method of pars plana vitreous aspiration to control excessive vitreous pressure during penetrating keratoplasty.
Methods. All cases of penetrating keratoplasty were reviewed retrospectively in a large cornea subspecialty private practice over a 5-year period, and 70 cases of penetrating keratoplasty complicated by excessive posterior pressure were identified. Study eyes were treated with a pars plana vitreous aspiration technique to relieve excessive posterior vitreous pressure. The main study parameters included preoperative best corrected visual acuity (BCVA), postoperative BCVA at the last recorded follow-up visit, refractive cylinder at 1 year, complications related to surgery, and other conditions that may have influenced visual function. The mean follow-up period was 24.5 months with a range of 1 to 61.1 months.
Results. Adverse outcomes during the extended period of follow-up included rejection in 11 of 70 eyes, graft failure in 7 of 70 eyes, glaucoma in 4 of 70 eyes, and postoperative cystoid macular edema (CME) in 5 of 70 eyes. Posterior capsulotomies using the neodymium–yttrium aluminum garnet laser were necessary in 10 of 70 patients during the follow-up period. The average magnitude of refractive astigmatism at 1 year after surgery was 3.73 diopters (D) with a range of 0 to 8 D. There were no known retinal complications other than CME and no complications that could be directly attributed to the pars plana vitreous aspiration technique.
Conclusions. Pars plana anterior vitreous aspiration is a safe and effective technique for controlling increased vitreous pressure, which can complicate penetrating keratoplasty.
From the Shaw Eye Center, Phoenix, Arizona, U.S.A.
Submitted August 14, 2000.
Revision received December 11, 2000.
Accepted December 13, 2000.
Address correspondence and reprint requests to Dr. Robert H. Gross, Shaw Eye Center, 525 N. 18th Street, Suite 501, Phoenix, AZ 85006, U.S.A.