ABSTRACT
Objective To study the effect of lidocaine on the expression of CD11b/CD18 and MPO in lung injury after hemorrhagic shock in rats. Methods Eighty male Wistar rats weighing 230-270 g were randomly divided into 4 groups: sham operation group ( group Ⅰ, n = 8 ) received operation without shock, shock group ( group Ⅱ, n = 8 ) received hemorrhagic shock without resuscitation , normal saline treatment group (group Ⅲ, n = 32 ) received normal saline after shock, lidocaine treatment group ( group Ⅳ, n = 32 ) received lidocaine after shock. The animals were anesthetized with intraperitoneal pentobarbital sodium 40 mg? kg-1 . Hemorrhagic shock was induced by withdrawing blood from right femoral artery at the rate of 2.0 ml?kg-1? min-1 , MAP was maintained at 40 mm Hg for 60 min before resuscitation. Direct arterial MAP and HR were continuously monitored. Group Ⅳwas received lidoacaine at the beginning of resuscitation with a bonus dose 2.0 mg? kg-1 and then followed continuous infusion1.0mg?kg-1?h-1 for 2 h. Group III was received the same dose of normal saline. Flow cytometric analysis was used to assess the expression of CD11b/CD18 on leukocyte and the change of myeloperoxidase (MPO) in the lung was studied at the end of shock (groupⅡ ) and at 2,4, 8, 12 h after resuscitation (group Ⅲ, group Ⅳ) . The rats were sacrificed and the piece of lung was immediately removed for electron microscopic examination. Result In group Ⅲand group Ⅳ ,the expression of CD11b/CD18 on PMNs and MPO in lung were increased significantly compared with Group Ⅰ. Microscopic examination indicated the longer time of reperfusion ,the more serious injury of the lung. And in groupⅣ ,the changes of CD11b/CD18 and MPO were reduced as compared with group Ⅲ (P