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目的在Langendorff离体灌注模型研究七氟烷预处理对再灌注心律失常的影响。方法取SD大鼠心脏建立Langendorff灌注模型,随机分入以下三组:(1)对照组;(2)缺血再灌注组;(3)七氟烷预处理组(3%七氟烷预处理15分钟)。记录各组的血流动力学、心电图,测量冠脉流出液肌钙蛋白I水平,测定细胞内钙离子和活性氧水平。结果七氟烷预处理能显著增加缺血再灌注损伤后左室发展压、左室内压上升/下降速率和心率,降低左室舒张末期压力,减少冠脉流出液肌钙蛋白I水平(P均<0.05)。在再灌注心律失常方面,与缺血再灌注组相比,七氟烷预处理能显著减少室性早搏个数[从182(133)次/分降至83(52)次/分],缩短室速[41(45)s降至20(22)s]和室颤[从22(43)s降至0(0)s]的发作时程,减少室颤发生率(从80%降至10%),并降低再灌注心律失常评分[从4(0)降至2(0)](P均<0.05)。七氟烷预处理还能降低心肌细胞内钙离子和活性氧水平(P均<0.05)。结论七氟烷预处理对缺血再灌注损伤心脏起保护作用,能改善离体大鼠心脏的再灌注心律失常。
Objective To investigate the effect of sevoflurane preconditioning on reperfusion arrhythmia in Langendorff perfusion model. Methods Langendorff perfusion model was established in SD rats. The rats were randomly divided into the following three groups: (1) control group; (2) ischemia-reperfusion group; (3) sevoflurane preconditioning group 15 minutes). The hemodynamics and electrocardiogram of each group were recorded. The level of cardiac troponin I was measured and the level of intracellular calcium and reactive oxygen species were measured. Results Sevoflurane preconditioning significantly increased left ventricular pressure, left ventricular pressure rise / decline rate and heart rate, decreased left ventricular end-diastolic pressure and decreased coronary flow cardiac troponin I (P <0.05). In reperfusion arrhythmias, sevoflurane preconditioning significantly reduced the number of ventricular premature beats [from 182 (133) / min to 83 (52) / min) compared to the ischemia-reperfusion group, shortening Decreased the incidence of ventricular fibrillation (from 80% to 10 (n = 10)) at the onset of ventricular tachycardia [41 (45) s to 20 (22) s] and ventricular fibrillation [from 22 (43) s to 0 %), And decreased the reperfusion arrhythmia score [from 4 (0) to 2 (0)] (all P <0.05). Sevoflurane preconditioning also decreased the levels of intracellular calcium and ROS (all P <0.05). Conclusion Sevoflurane preconditioning can protect the heart from ischemia-reperfusion injury and improve the reperfusion arrhythmia in isolated rat heart.