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Aim: To compare freeze-dried and fresh platelet-rich plasma (PRP) preparations, in a pre-clinical study. Materials &amp; methods: 30 Wistar male rats were used to compare and characterize human PRP which was applied at the perilesional area in an acute wound model, evaluated by macroscopical and histological analysis. Results: Despite the increased growth factor concentration after the freeze-drying process, no change in the healing kinetics was observed in vivo. Nevertheless, a significant increased number of myofibroblasts was demonstrated in comparison with the fresh PRP group. We also demonstrated a significant increased percentage of blood vessels in comparison with controls in both the superficial and deep epidermis. Conclusion: These results encourage randomized clinical trials to evaluate the effectiveness of freeze-dried PRP for skin ulcer treatment.

Freeze-dried versus fresh platelet-rich plasma in acute wound healing of an animal model