小型猪不停跳心内直视手术麻醉及体外循环管理
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摘要
目的:研究小型猪心脏不停跳心内直视手术的麻醉和体外循环(CPB)管理方法。
     方法:小型猪12例,常规建立CPB,阻断上、下腔静脉,不阻断升主动脉,心脏不停跳下行三尖瓣成形术。,采用异氟烷静吸复合麻醉方案。麻醉诱导:氯胺酮3~5 mg·kg-1。肌注,3%戊巴比妥钠15~20 mg·kg-1静注;麻醉维持:异氟烷持续1~1.5最低肺泡气有效浓度(MAC)吸入,间断静脉注射芬太尼15~20 ug·kg-1、维库溴铵0.10~0.15 ug·kg-1和咪唑安定0.1~0.2 mg·kg-1。检测有创动脉血压,动脉血气分析。CPB期间维持肛温35~37℃上,CPB转机流量60~80 ml·kg-1·min-1,平均动脉压(MAP)5.33~9.33 kPa(60~90mmHg),血红蛋白浓度(Hb)60~80g/L,红细胞压积(Hct)25~30%。记录麻醉诱导时间、CPB转机时间、麻醉维持时间、呼吸机辅助时间等,观察CPB期间血流动力学及血气的变化,记录麻醉及CPB相关并发症。
     结果:麻醉诱导10.0±2.9 min、CPB转机83.4±8.0 min、麻醉维持248.7±46.8 min、呼吸机辅助344.3±37.5 min。CPB期间血流动力学平稳;乳酸值转机中升高,差异有统计学意义(P<0.05),关胸即刻恢复;Hb及Hct转机后降低(P<0.05),停机后恢复。无窒息、恶性心律失常等并发症发生。死亡3例,其中2例非麻醉及CPB因素,1例死于术后低心排血量综合症。
     结论:异氟烷静吸复合麻醉效果稳定,苏醒快;心脏不停跳CPB对呼吸、循环影响小,并发症少。两种技术联合应用,优化了围术期麻醉和CPB管理方案,减少了组织器官的损伤,为心内直视手术较理想的选择。
Objective:To investigate the methods of anesthetic and cardiopulmonary bypass(CPB) management for beating heart surgery in minipigs.
     Methods:Twelve minipigs were involved in the experiment, set up CPB plumbing with routine method, blockage superior and inferior vena cava cannulas with out ascending aorta cannula, execution of tricuspid valve plasty with beating heart. The proposal of anesthesia is isoflurane-based inhalated combined intravenous injected, induction with ketamine intramuscular and Pentobarbital injected intravenously; maintenance with isoflurance1.0-1.5MAC inhalated, fentanyl 15-20ug·kg-1·h-1, midazolam 0.1-0.2ug·kg-1·h-1 and pipecuronium 10-0.15ug·kg-1·h-1 injected inconsecutively. Rectal temperature was maintained between 35-37℃during CPB procedure, flow volumes were 60-80 ml·kg-1·h-1,mean arterial blood pressure were 5.33-9.33kPa (60-90mmHg), hemoglobin concentration were 60-80g/L, Hct were 25-30%. Invasive blood pressure, blood gas analysis were detected. Times on induction and maintenance of anesthesia, time of CPB and ventilator procedure were recorded. Complications of anesthesia and CPB were obtained as well.
     Results:Time on induction and maintenance of anesthesia were 10.0±2.9min and 83.4±8.0min, time of CPB and ventilator procedure were 248.7±46.8min and 344.3±37.5min, hemodynamics were maintained stabled, lactic acid values were increased signifcantly after CPB cessation and decreased to the foundation level after the period of chest-closed; hemoglobin concentration and Hct were lower during CPB procedure and achived to normal state after CPB cessation.
     Conclusion:Isoflurane-based inhalated combined intravenous injected anesthesia were effective, maintained hemodynamics stablely, time on palinesthesia were shorter; CPB procedure has less influence on circulation, respiratory, and tissue metabolism, it takes less complications.The method of anesthetic and CPB management are reasonable choice for open heart operation with beating heart.
引文
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