A study on continuous low-flow perfusion with low-potassium dextran for donor isolated lung preservation

OBJECTIVE: To test the validity of continuous low-flow perfusion with low-potassium dextran (LPD) to preserve rabbit lung. METHODS: Isolated rabbit lungs were preserved for eight hours either in Ringer's solution by simple storage (Group I) or in continuous low-flow perfusion with LPD (Group II). After preservation, lung functions were assessed to compare these two methods. RESULTS: The water gain in Group I was higher than that in Group II. During reperfusion, the functional test values for the immersed lungs were lower than those for the perfused lungs. The lipid peroxidation product (MDA) was significantly decreased in perfused lungs during reperfusion. CONCLUSIONS: Low-flow perfusion with LPD is better than immersion for the lung preservation.

含BDM及钙心脏保存液保存离体鼠心

目的研究含二乙酰—肟（２，３－ｂｕｔａｎｅｄｉｏｎｅｍｏｎｏｘｉｍｅ，ＢＤＭ）及Ｃａ２＋的Ｅｕｒｏ－Ｃｏｌｉｎｓ晶体保存液对离体鼠心脏的保存作用。方法采用离体工作心模型，观察保存前后鼠心的心功能、心率、肌酸磷酸激酶释放及超微结构的变化。结果含ＢＤＭ及Ｃａ２＋保存液保存的鼠心其左心室收缩压（ＬＶＳＰ），左室压力变化最大速率（ＬＶ±ｄｐ／ｄｔｍａｘ）及心率（ＨＲ）与对照组无显著性差异，肌酸磷酸激酶释放及超微结构也显示细胞损伤程度轻于普通保存组。结论ＢＤＭ及Ｃａ２＋可增加心脏冠脉流量，改善心脏功能恢复。

含血低钾右旋糖酐液肺保存效果的实验研究

目的:比较含与不含20%自体静脉血的低钾右旋糖酐(LPD)液的肺保存效果。方法:将12只犬分为2组,分别用含与不含20%自体静脉血的LPD液灌注,10℃保存12h后,分别在离体状态下,连续通气和温静脉血再灌注10min。比较供肺流入、流出血的氧分压、二氧化碳分压、呼吸道峰压及再灌注后离体肺的湿/干重量比,并行病理学检查。结果:两组间氧分压犤(21.55±3.94)kPa与(20.90±1.16)kPa犦、二氧化碳分压犤(4.25±0.15)kPa与(4.32±0.11)kPa犦、呼吸道峰压犤(19.00±1.41)kPa与(18.50±1.87)kPa犦及再灌注后离体肺的湿/干重量比(6.47±0.41与6.09±0.28)之间差异无统计学意义(P>0.05),病理切片均未见肺泡内出血。结论:含与不含20%自体静脉血的LPD液的肺保存效果差异无统计学意义,肺保存效果并未因灌注液中加血而明显改善。

持续低流量灌注对兔心肺联合保存的作用

应用Ｋａｎｅｋｏ兔异位心肺移植模型，研究持续低流量灌注技术对兔心肺联合保存的效果。选用健康家兔３２只，随机均分为对照组及实验组，保存期间，实验组心肺经主、肺动脉持续低流量灌注４℃的相应保存液。心肺移植后，连续观察９０分钟，每３０分钟记录供体左室收缩压、舒张末压和右房压以及气道峰压和动脉血氧分压，以判定移植物心肺功能。实验结束时取心肺组织测定丙二醛含量并计算移植物水分获得。结果实验组移植物水份获得低于对照组，心肺功能优于对照组，再灌注时丙二醛含量低于对照组。认为持续低流量灌注技术保存离体心肺效果优于单纯低温静置保存。