Endothelial lamellar keratoplasty using an artificial anterior chamber and a microkeratome

Ashley Behrens, Kenneth Ellis, Li Li, Paula M. Sweet, Roy S. Chuck

Research output: Contribution to journalArticle

Abstract

Objective: To compare postoperative astigmatic change and graft stability using 2 different donor button diameters in endothelial lamellar keratoplasty to treat corneal endothelial failure. Methods: A 200-μm-thick corneal flap keratectomy was performed in human donor corneoscleral rims (n = 20; 10 donors and 10 recipients) using an artificial anterior chamber and a manual microkeratome (ALTK System; Moria USA, Doylestown, Pa). After flap reflection, stromal bed trephination was performed to obtain a disc consisting of posterior stroma, Descemet membrane, and endothelium. Host beds of 7.0 mm and 7.25-mm (n = 5) or 7.50-mm (n = 5) donor buttons were obtained using a freehand trephine. The graft was secured with 8 interrupted sutures (10-0 nylon) in the stromal bed. The flap was sutured with 3 interrupted sutures. Transplanted corneas were submitted to increasing intrachamber pressures to detect graft stability, and preoperative and postoperative videokeratographic data were recorded to assess astigmatic change. Results: The mean (SD) postoperative astigmatic change was 1.14 (3.17) diopters (D) in the 7.25-mm donor button group and 2.27 (1.77) D in the 7.50-mm donor button group (P = .69). Mean (SD) resisted pressures of 75.4 (44.81) mm Hg and 100.4 (46.86) mm Hg were observed in the 7.25-mm and 7.50-mm groups, respectively (P = .54). Conclusion: Both donor button sizes exhibited similar graft stability and astigmatic postoperative change in this experimental model. Clinical Relevance: As endothelial lamellar keratoplasty becomes further developed as a clinical alternative to penetrating keratoplasty, this laboratory model system should be useful in evaluating different mechanical factors that contribute to graft success.

Original languageEnglish (US)
Pages (from-to)503-508
Number of pages6
JournalArchives of Ophthalmology
Volume121
Issue number4
DOIs
StatePublished - Apr 1 2003
Externally publishedYes

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Corneal Transplantation
Anterior Chamber
Transplants
Sutures
Trephining
Descemet Membrane
Pressure
Penetrating Keratoplasty
Nylons
Cornea
Endothelium
Theoretical Models

ASJC Scopus subject areas

  • Ophthalmology

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Endothelial lamellar keratoplasty using an artificial anterior chamber and a microkeratome. / Behrens, Ashley; Ellis, Kenneth; Li, Li; Sweet, Paula M.; Chuck, Roy S.

In: Archives of Ophthalmology, Vol. 121, No. 4, 01.04.2003, p. 503-508.

Research output: Contribution to journalArticle

Behrens, Ashley ; Ellis, Kenneth ; Li, Li ; Sweet, Paula M. ; Chuck, Roy S. / Endothelial lamellar keratoplasty using an artificial anterior chamber and a microkeratome. In: Archives of Ophthalmology. 2003 ; Vol. 121, No. 4. pp. 503-508.
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abstract = "Objective: To compare postoperative astigmatic change and graft stability using 2 different donor button diameters in endothelial lamellar keratoplasty to treat corneal endothelial failure. Methods: A 200-μm-thick corneal flap keratectomy was performed in human donor corneoscleral rims (n = 20; 10 donors and 10 recipients) using an artificial anterior chamber and a manual microkeratome (ALTK System; Moria USA, Doylestown, Pa). After flap reflection, stromal bed trephination was performed to obtain a disc consisting of posterior stroma, Descemet membrane, and endothelium. Host beds of 7.0 mm and 7.25-mm (n = 5) or 7.50-mm (n = 5) donor buttons were obtained using a freehand trephine. The graft was secured with 8 interrupted sutures (10-0 nylon) in the stromal bed. The flap was sutured with 3 interrupted sutures. Transplanted corneas were submitted to increasing intrachamber pressures to detect graft stability, and preoperative and postoperative videokeratographic data were recorded to assess astigmatic change. Results: The mean (SD) postoperative astigmatic change was 1.14 (3.17) diopters (D) in the 7.25-mm donor button group and 2.27 (1.77) D in the 7.50-mm donor button group (P = .69). Mean (SD) resisted pressures of 75.4 (44.81) mm Hg and 100.4 (46.86) mm Hg were observed in the 7.25-mm and 7.50-mm groups, respectively (P = .54). Conclusion: Both donor button sizes exhibited similar graft stability and astigmatic postoperative change in this experimental model. Clinical Relevance: As endothelial lamellar keratoplasty becomes further developed as a clinical alternative to penetrating keratoplasty, this laboratory model system should be useful in evaluating different mechanical factors that contribute to graft success.",
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