安氟醚对体外循环下心内直视手术心肌缺血再灌注损伤的影响

目的：研究安氟醚对体外循环心内直视手术期间心肌缺血再灌注损伤的影响。方法：选择择期行心瓣膜置换的风湿性心脏病患者30例，随机分为3组，Ⅰ组、Ⅱ组在主动脉阻断前分别吸入1．0MAC、0．5MAC的安氟醚，Ⅲ组为对照组静脉给芬尼太。在围术期不同时点作血肌酸磷酸激酶(CK—MB)、脂质过氧化产物(MDA)、超氧化物歧化酶(SOD)测定。结果：3组患者CK—MB、MDA、SOD值均于主动脉开放即刻升高，与麻醉前、块血前比较差异有显著性(P均＜0．05)，于主动脉开放后10、30min达最大值，并高于主动脉开放即刻(P＜0．05)，术后24h虽低于主动脉开放10min时(P＜0．05)，但仍高于麻醉前。在主动脉开放即刻、10min，Ⅰ组患者CK—MB值显著高于Ⅱ组和Ⅲ组(分别P＝0．0220、0．0108、0、0202和0．0295)；主动脉开放60min时，Ⅰ组患者CK—MB值也高于Ⅲ组(P＜0．0001)；在主动脉开放10、30min时，Ⅰ组MDA值明显高于Ⅱ组(分别P＝0．0060、0．0364)；在主动脉开放10min时，Ⅰ组SOD值也高于Ⅱ、Ⅲ组(分别P＝0．000l和0．0084)。各组CK—MB值与主动脉阻断时间至正相关(r＝0．55—0．8l，P均＜0．05)；CK—MB值与SOD、MDA值之间无明显相关性；MDA与SOD间Ⅰ组和Ⅱ组均呈正相关(r＝0．8l、0．7l，P均＜0．01)。结论：体外循环下心内直视手术期间，存在心肌缺血再灌注损伤，并伴有氧自由基产生增加和机体抗氧化的储备提高。大剂量安氟醚吸入可能对心肌酶谱及氧自由基的产生有一定的影响。

Effects of enflurane on myocardial reperfusion injury during cardiac surgery with cardiopulmonary bypass

OBJECTIVE: To study the effects of inhalation enflurane (Enf) before aortic clamping on myocardial reperfusion injury in cardiac surgery with cardiopulmonary bypass (CPB). METHODS: hirty patents undergoing selective cardiac valve replacement were randomly allocated to three groups. Group I and group II inhaled 1.0 MAC and 0.5 MAC Enf before clamping aorta, respectively. Group III was the control group interval administration with Fentanyl. RESULTS: Immediately upon aortic clamp release (T2), the value of CK-MB, MDA and SOD of all the groups was significantly increased, however,their concentration did not peak significantly until T3 and T4(10 and 30 min after clamp aorta release). The levels at 60 min (T5) and 24 hours (T6) aorta were lower than T4 but still higher than T(0). At T3 and T4, CK-MB levels in group I were significantly higher than those in II and III groups (P=0.0220, 0.0108 and 0.0202, 0.0295). At T6, the CK-MB level of group II was significantly higher than that of group III (P<0.0001). At T4 and T5, the MDA value of group I was higher than that of group II (P=0.0060 and 0.0364). Meanwhile, the SOD level in group I was also higher than that of group II and group III at the T4 point (P<0.0001 and 0.0084). There was a correlation between the CK-MB value and the aorta clamping time,correlation coefficient range being 0.55 - 0.81,(P<0.05). However, there was no correlation between the CK-MB and MDA, SOD. CONCLUSION: There is ischemia reperfusion injury during cardiac surgery CPB with the increase of OFR production and elevation of the antioxidant reserve. Inhalation of large dose of enflurane may result in increased myocardial ischemia reperfusion injury manifested by elevated levels of myocardial enzymes and OFR production.