终末热灌注对心脏移植术中猪供体心脏的保护作用

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目的:观察终末热灌注对心脏移植术中猪供体心脏的保护作用。方法:12对配型成功的同家系瑞典猪随机分为实验组与对照组,每组6对,分别行心脏移植术。对照组手术完成后正常放开主动脉钳恢复心脏灌注,实验组则在开放主动脉前经历短暂的终末热灌注再恢复灌注。分别于供体心脏缺血前,恢复灌注5 min、30 min、1 h及2h取冠状窦口和主动脉根部血样,监测冠状动脉血流量,记录血样中氧分压及乳酸含量;在恢复灌注时及恢复灌注4、12、24 h分别抽取猪颈内静脉血样检测肌钙蛋白T。结果:2组恢复灌注后冠状动脉血流量间差异无统计学意义(F组间=2.193,P=0.173)。2组心脏氧利用率,不同时间点间心肌乳酸利用量及血浆肌钙蛋白T浓度差异有统计学意义(F组间=9.041、F时间=44.844和138.908,P<0.05);实验组心脏氧利用率更早恢复正常,在恢复灌注5 min,实验组心肌乳酸利用量低于对照组,在恢复灌注24 h,实验组血浆肌钙蛋白T浓度低于对照组(P<0.05)。结论:心脏移植术中终末热灌注可降低心脏无氧代谢水平,促进心肌细胞功能恢复,减轻心肌损伤。
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