title: Corneal transplant tolerance of cryopreservation.
abstract: OBJECTIVE
  To study the outcome of corneal transplants performed with cryopreserved tissue.
  
  
  METHODS
  Maisonneuve-Rosemont Hospital medical records of all corneal transplantations performed with cryopreserved tissue by one surgeon (M.L.F.) between March 1978 and April 1991 were reviewed. The Kaufman--Capella cryopreservation technique was used. Corneas were cryopreserved for periods of 3 days to 16.8 years (mean, 4.6 years) before transplantation.
  
  
  RESULTS
  We report a mean follow-up of 54 months (range, 2.8--151.3 months). Survival analysis showed the probability of a clear graft to be 76% at 1 year and 73.2% at 2 years. At the time of the last visit, visual acuity was 20/40 or better in 61 eyes (49.2%). The mean postoperative pachometry was 0.58 mm (range, 0.50--0.75 mm). Specular microscopy performed in 57 eyes showed a mean endothelial cell count of 938 cells/mm(2) 55.1 months (range, 2.9--151.3 months) after surgery. For comparison purposes, the outcome of a subgroup of cryopreserved (n = 33) and noncryopreserved (n = 26) corneas transplanted by the same surgeon between April 1986 and April 1990 was studied.
  
  
  CONCLUSIONS
  Despite an increase in the primary failure rate and higher initial endothelial cell loss, cryopreserved transplants are viable. Although we do not recommend cryopreservation of corneas for elective surgery, we consider that cryopreserved corneas can be very useful in emergency situations when tissue availability is a problem.
authors.affiliation: Department of Ophthalmology, University of Montreal, Montreal, Canada.
authors.forename: I
authors.initials: I
authors.lastname: Brunette
authors.forename: M
authors.initials: M
authors.lastname: Le François
authors.forename: M C
authors.initials: MC
authors.lastname: Tremblay
authors.forename: M C
authors.initials: MC
authors.lastname: Guertin
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002452:Cell Count; D002648:Child; D002675:Child, Preschool; D003315:Cornea; D016039:Corneal Transplantation / Q000379:methods*; D015925:Cryopreservation; D004728:Endothelium, Corneal / Q000166:cytology; D005125:Eye Banks; D005260:Female; D006085:Graft Survival; D006801:Humans; D008297:Male; D008875:Middle Aged; D009926:Organ Preservation; D012189:Retrospective Studies; D014019:Tissue Donors; D016896:Treatment Outcome