Super-Thick Amniotic Membrane Graft for Ocular Surface Reconstruction.

Abstract

The purpose of this study was to evaluate super-thick amniotic membrane grafts (ST-AMGs) for ocular surface reconstruction. Retrospective, interventional case series. This was a single-center study of clinical practice that included select patients with typically large ocular surface abnormalities that required reconstruction. The intervention studied was surgical insertion of a ST-AMG for reconstruction or repair of the ocular surface. Main outcome measures included intraoperative handling, graft position at 1 week post implantation, graft dissolution at 3 weeks, epithelialization of the ocular surface and symblepharon. Eleven ST-AMGs were implanted after resection with cryotherapy: 5 conjunctival melanoma, 4 squamous cell carcinoma, 1 sebaceous carcinoma, and 1 atypical pterygium. In addition, 1 was implanted for scleral necrosis. ST-AMGs were up to nine times thicker than standard amniotic grafts and were therefore amenable to both running and interrupted 7-0 Vicryl sutures without cheese-wiring. All cases had a well-positioned ST-AMG at 1 week and 75% (n = 9) had partial graft dissolution at 3 weeks. Complete epithelialization without wound dehiscence was noted in all cases. However, secondary (after additional tumor treatment) symblepharon formed in 16.7% (n = 2). In all cases, the mean visual acuity and intraocular pressures remained unchanged during conjunctival reconstruction and subsequent secondary treatments. Post epithelialization adjuvant topical chemotherapy was given to extend treatment margins and treat presumed occult disease in 50% (n = 6). At mean follow-up of 25.5 months (median 10, range 3-90), 10 cases (83.3%) showed complete local tumor control, 1 showed revascularization of the scleral melt, and 1 required orbital exenteration. ST-AMGs were easy to suture and relatively persistent. Epithelialization of the ocular surface without primary symblepharon formation was noted. ST-AMGs should be considered an alternative for ocular surface reconstruction.