[The changes of fibrinolysis in plasma and wounds in rats inflicted with deep partial thickness burns]

We observed the changes in wound histopathology and fibrinolysis of rats with deep partial thickness burns during 10 days after scalding in order to study the relations of early progressive damage of deep partial thickness burn wound and the healing of the wound to fibrinolysis. Using Masson's trichrome stain of collagen, we demonstrated that partial thickness burn wound progressively deteriorated within 72 hours postburn, and epidermal cells on wound edge proliferated, creeping between necrotic and residual collagen by 10th day postburn. The results of assays of fibrinolytic parameters in plasma and 24 hour exudate from wound showed that fibrinolysis activated at 2 hour postburn but had been suppressed by 24 hour postburn till last day (10 day postburn) of the observation. The analysis of dynamic changes and relations in fibrinolytic parameters revealed that the suppressive factors of fibrinolysis might be enhanced activities of PAI, alpha 2-antiplasmin and antithrombin II after injury. Results suggested that suppression of fibrinolysis might protect fibrin deposited in the wound from lysis and play an important role in early progressive deterioration of deep partial thickness burn and regulation of its healing.