RESUMO
Objective To investigate the effects of escharectomy at different time points on myocardial damages in scalded rats during shock stage. Methods A total of 42 rats were inflicted with 30% TBSA Ⅲ scalding on their backs and then randomly and equally divided into 7 groups: burned control group (C) and escharectomy groups at hour 1, 3, 6, 12, 24 and 36 postburn. Another 6 rats were employed as normal control (N). The serum levels of creatine kinase isoenzymes MB (CKMB), aspartate aminotransferase (AST) were determined and morphological changes in myocardial tissues were observed 72 hours after the burn. Results The serum levels of CKMB and AST were higher in the C group than in other groups, and the levels in escharectomy groups were increased along with the prolongation of scar cutting. Pathologically, the myocardial tissues were severely damaged in C group, and the later the scars were cut, the severe the damages were in the escharectomy groups except the 2 groups with scars cut at hour 1 and 3. Conclusion Escharectomy in shock stage can effectively prevent the damage of the myocardial tissues from postburn injury and the earlier it is performed, the better the result is.