title: Room temperature storage and cryopreservation of canine platelet concentrates.
abstract: OBJECTIVE
  To determine whether in vitro viability and function, and microbiological sterility, of canine platelet concentrates (PC) could be retained during storage at 20 to 24 C (room temperature [RT]) for up to 7 days and cryopreservation for 6 months.
  
  
  METHODS
  14 mature dogs.
  
  
  METHODS
  PC prepared by centrifugation of fresh blood were stored for 7 days at RT with continuous agitation. An aliquot of each was cryopreserved with 6% dimethyl sulfoxide at -74 C for 6 months. Fresh PC (day 0) were tested by microbial culture and measurement of platelet count, mean platelet volume, pH, glucose and lactate concentrations, lactate dehydrogenase activity, response to hypotonic stress, and aggregation. Tests were also performed on PC stored at RT on days 3, 5, and 7, and on the cryopreserved aliquots after thawing.
  
  
  RESULTS
  After 7 days at RT, microbial growth was not evident, and decrease in platelet number was not significant. On the basis of pH and glucose and lactate concentrations, metabolic activity was maintained throughout RT storage. On the basis of mean platelet volume and lactate dehydrogenase activity, platelet swelling and membrane damage had occurred. Aggregatory responses decreased during RT storage, and platelets recovered poorly from hypotonic stress. After cryopreservation for 6 months, microbial growth was not evident, but platelet numbers were significantly decreased. Mean platelet volume and lactate dehydrogenase activity were significantly greater, compared with values for day-0 PC. Crypreserved platelets aggregated poorly and did not respond to hypotonic stress.
  
  
  CONCLUSIONS
  Platelet viability and microbiological sterility are retained in canine PC stored for 7 days at RT, but platelet function pregressively decreases and day-7 platelets are substantially damaged. Crypreservation of PC results in considerable damage, compared with that of PC stored at RT.
  
  
  CONCLUSIONS
  Similar to human PC, canine PC stored at RT for up to 5 days can be recommended for treatment.
authors.affiliation: Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Canada.
authors.forename: K
authors.initials: K
authors.lastname: Allyson
authors.forename: A C
authors.initials: AC
authors.lastname: Abrams-Ogg
authors.forename: I B
authors.initials: IB
authors.lastname: Johnstone
mesh_terms: D000818:Animals; D001786:Blood Glucose / Q000032:analysis; D001792:Blood Platelets / Q000737:chemistry / Q000166:cytology* / Q000382:microbiology; D001793:Blood Preservation / Q000379:methods / Q000662:veterinary*; D002498:Centrifugation / Q000379:methods / Q000662:veterinary; D015925:Cryopreservation / Q000379:methods / Q000662:veterinary*; D004121:Dimethyl Sulfoxide; D004285:Dogs / Q000097:blood*; D006863:Hydrogen-Ion Concentration; D007770:L-Lactate Dehydrogenase / Q000097:blood; D007773:Lactates / Q000097:blood; D010974:Platelet Aggregation; D010976:Platelet Count / Q000662:veterinary; D013696:Temperature; D013997:Time Factors
chemical_list: D001786:Blood Glucose; D007773:Lactates; D007770:L-Lactate Dehydrogenase; D004121:Dimethyl Sulfoxide