吸入麻醉药后处理对大鼠心肌缺血再灌注损伤影响的比较

目的 探讨七氟醚和异氟醚后处理在成年大鼠心肌缺血再灌注损伤(MIRI)中的心肌保护作用.方法 将成年雄性SD大鼠24只,采用随机数字表法分为对照组(C组)、缺血再灌注组(R组)、七氟醚后处理组(S组)和异氟醚后处理组(I组),每组6只.建立Langendorff离体心脏灌注模型.于平衡灌注末及再灌注30、90 min时记录心率(HR)、左心室舒张末压(LV-EDP)、左心室发展压(LVDP)、左心室压力上升最大速率(LV+ dp/dtmax)和左心室压力下降最大速率(LV-dp/dtmax);灌注结束后,取心尖部心肌组织1 mm3,电镜下观察线粒体结构并评分,剩余心脏组织采用2,3,5-氯化三苯基四氮唑(TTC)染色法测定心肌梗死面积(MIS).结果 与R组比较,S组和I组心肌再灌注后的心功能指标改善,MIS减小,线粒体损伤减轻(P＜0.05);与S组比较,I组心肌再灌注后的心功能变差,MIS增大,线粒体损伤程度加重(P＜0.05).结论 七氟醚和异氟醚后处理在成年大鼠MIRI中均有保护作用,但七氟醚后处理的心肌保护作用优于异氟醚后处理.

Comparison of effects of post-treatment with inhalation anesthetics on rat myocardial ischemia reperfusion injury

Objective To compare the myocardial protective effects of post-treatment with sevoflurane and isoflurane on myocardial ischemia-reperfusion injury(MIRI) in adult rats.Methods Twenty-four adult male SD rats were divided into four groups (n =6) by using the random number table,control group (C),isehemia-reperfusion group (R),sevoflurane post-treatment (S) and isoflurane post-treatment group(I).The Langendorff isolated heart perfusion model was established.The heart rate(HR),left ventricular end-diastolic pressure(LLVEDP),left ventricular developed pressure(LVDP),maximum rate of rise of left ventricular pressure(LV+-dp/dtmax),and maximum rate of decrease of left ventricular pressure(LV-dp/dtmax) were recorded at the end of equilibrium perfusion,and at 30,90 min of reperfusion,respectively.At the end of infusion,1 mm3.of apical myocardial tissue was removed for observing mitochondrial structure under electron microscopy and scoring.The myocardial infarct size(MIS) in the remaining heart tissue was measured by TTC staining.Results Compared with the R group,the S and I groups showed improved cardiac function indicators,decreased MIS,and reduced mitochondrial damage after reperfusion(P＜0.05).Compared with the S group,the I group showed worse heart function,increased MIS,and more severe mitochondrial damage after reperfusion(P＜0.05).Conclusion Post-treatment with sevoflurane and isoflurane has a protective effect on MIRI in adult rats.Post-treatment with sevoflurane has a better cardioprotective effect than that with isoflurane.