热缺血20 min猪心脏死亡供体心冠状动脉内皮功能的变化

BACKGROUND: Myocardial and coronary endothelial injury occurs in donor hearts due to warm ischemia during cardiac transplantation. Coronary endothelial structure and function play a critical role in long-term outcomes for patients after cardiac transplantation.  OBJECTIVE: To study the effect of hypoxia-induced warm ischemia (20 minutes) on coronary endothelial function of porcine donor hearts after cardiac death (DCD). METHODS: Sixteen healthy Swedish domestic pigs were randomized into control (n=6), DCD (n=5), and DCD plus cold storage (n=5) groups, respectively. A DCD model in pigs was established using the method of hypoxia-induced 20-minute warm ischemia in the DCD and DCD plus cold storage groups. Isolation of the heart left anterior descending coronary artery or combined with heart preservation pretreatment for 4 hours was performed in the DCD and DCD plus cold storage groups. The maximum coronary endothelium-dependent relaxation was determined in the three groups. RESULTS AND CONCLUSION:There were no significant differences in the maximum coronary endothelium-dependent relaxation and the minus logarithmic of substance concentration induced 50%maximal relaxation among three groups (P > 0.05). These results indicate that 20-minute warm ischemia cannot lead to obvious coronary endothelial dysfunction. In addition, DCD combined with 4-hour cold storage does not affect coronary endothelial function. 中国组织工程研究杂志出版内容重点：组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松;组织工程     

离体猪心脏的保存及功能评价

目的：探索一种新型供体心脏体外保存及功能评价的方法。方法：将血型一致的12头瑞典健康家猪作为实验对象,随机分为心脏供体组和血液供体组两组,每组6头。用体外循环机以不同流量（0．76、1．00、2．00、3．00、4．00 L／min）在37℃条件下灌注离体心脏,监测动静脉血气和离体心脏血压、心率、心肌耗氧量及氧摄取率。结果：不同灌注流量下,离体心脏心肌耗氧量、心率、收缩压、平均压、左室收缩压差异均有统计学意义（ F＝23．500,331．010,77．701,10．101和89．301, P 均＜0．001）。灌注流量较高,离体心脏上述各指标也较高（ F ＝0．460, P＞0．05）。不同灌注流量组心肌氧摄取率差异无统计学意义（F＝0．426,P＝0．788）。结论：该模型可使离体心脏心功能保持良好并得到较好的保存。     

终末热灌注对心脏移植术中猪供体心脏的保护作用

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2 h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5min,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。