267例主髂动脉闭塞的手术治疗经验

目的 探讨肾动脉开口水平以下腹主动脉闭塞及髂动脉闭塞的手术方式选择及治疗经验。方法 回顾性分析267例主、髂动脉闭塞患者的临床资料。结果 267例患者全部行手术治疗。行腹主动脉－髂（股）动脉人工血管转流术145例,髂动脉－股动脉人工血管转流术40例,股动脉－股动脉人工血管转流术45例,腋动脉－股动脉人工血管转流术37例。总有效率为96．5％,围手术期病死率为3．5％。267例中178例得到随访,平均随访时间5年9个月,人工血管通畅率为82．0％。结论 符合正常血液动力学手术的主要术式是腹主动脉－（双）髂、股动脉人工血管转流术,对于年老、体弱者,特别是全身一般状况较差,伴有冠心病、高血压、脑动脉硬化、脑梗塞等慢性疾病的患者,应采用腋动脉－（双）髂股动脉人工血管转流术或股动脉－股动脉人工血管转流术,可明显减低手术病死率。     

彩超辅助下股浅静脉瓣膜环包术治疗原发性下肢深静脉瓣膜功能不全67例体会

目的评价术中彩超辅助下股浅静脉瓣膜环包术治疗原发性下肢深静脉瓣膜功能不全的疗效。方法回顾性分析1998年1月至2005年12月收治的原发性下肢深静脉瓣膜功能不全67例（76条患肢）的临床资料，根据不同时间段将患者分为两组，非彩超辅助组（1998年1月至2000年12月）33例（38条患肢），在股浅静脉和股深静脉汇合处稍远侧找到股浅静脉的第1对瓣膜，用人工血管片缩窄该处血管周径约1／3；彩超辅助组（2001年1月至2005年12月）34例（38条患肢），彩超确定股浅静脉第1对瓣膜的位置及返流程度，人工血管片均匀环包瓣膜，缩窄该处血管周径约1／4～1／3。结果术后1年两组间比较，彩超检查股浅静脉瓣膜返流时间，彩超辅助组≤1S的患肢明显增加，1～6S的患肢明显减少。差异均有统计学意义（P〈0．01；P〈0．05）。X线造影检查股浅静脉瓣膜功能，彩超辅助组患肢0级明显增加；Ⅰ～Ⅲ级明显减少。差异均有统计学意义（P〈0．01；P〈0．05）。结论术中彩超辅助下确定股浅静脉瓣膜的位置、返流程度，从而确定人工血管片环包位置确切、程度恰当。与传统股浅静脉瓣膜环包术比较有明显的优越性。     

兔股静脉延迟移植内皮素和一氧化氮变化的意义

目的：研究兔股静脉延迟移植血浆内皮素（ET）和一氧化氮（NO）含量的变化及其与血管痉挛、静脉移植的关系。方法：用放射免疫方法测定局部血浆ET的含量，用硝酸还原酶法及紫外可见分光光度计测定局部血浆中NO^-2/NO^-3含量，间接反映NO水平。结果：游离股静脉（FV）局部血浆ET含量术后2h和4h明显增高（P＜0．01），术后8h也增高（P＜0．05）；局部血浆NO含量术后2h和4h下降非常显著（P＜0．01），术后24h则又显著增高（P＜0．05）。结论：游离（未切断）FV术后16－24h，延迟切断准备移植的FV血浆中ET含量恢复正常，NO含量明显增高，是移植静脉血管危象发生率下降的原因，此时为切断静脉进行移植的最佳时间。     

非心肺转流冠脉搭桥围术期IL-2和IL-4的变化

目的：研究两种复合全麻下，非心肺转流冠脉搭桥（OPCAB）围术期辅助性T淋巴细胞的免疫应激反应，方法：24例患者随分入丙泊酚－芬太尼全凭静脉麻醉组（P组）和异氟醚－芬太尼静吸复合麻醉组（Ⅰ组），于诱导前，术中打开心包和旁路血管开放时及术后2h采集血标本，应用放免法检测血清白细胞介素2（IL－2）和白细胞介素4（IL－4）的含量。结果：IL－2两组均减少，P组术中、术后均较诱导前有非常显著性降低（P＜0．01），Ⅰ组打开心包时降低明显（P＜0．05），旁路血管开放时降低更显著（P＜0．01）。两组相比，Ⅰ组IL－2于旁路血管开放时比P组下降更明显（P＜0．01）。旁路血管开放时，P组IL－4明显高于Ⅰ组（P＜0．05）。结论：丙泊酚－芬太尼静脉麻醉行OPCAB术对抑制免疫应激反应有益，是有利于机体的保护性免疫反应。     

内脏动脉重建联合主动脉腔内修复杂交手术经验总结

目的总结内脏动脉重建联合主动脉腔内修复杂交手术经验。方法12例杂交手术一期或二期完成。内脏动脉重建术中制作多分支人工血管。人工血管主体与腹主动脉或髂动脉吻合,远端各分支与双侧肾动脉、肠系膜上动脉、腹腔干及其分支分别吻合。前期部分肾动脉的处理采用自体肾移植,后期完全采取人工血管旁路方案。出院后CT血管造影（CTA）随访各内脏动脉吻合口是否通畅。结果12例内脏动脉重建术,重建腹腔干及其分支共11支,肠系膜上动脉12支,肾动脉共18支（包括自体肾移植5支）。内脏动脉人工血管吻合方式,前期采用端侧吻合,后期优先采用端端吻合。3例发生腹膜后出血。2例自体肾移植发生肾积水、尿漏。1例内脏动脉重建术后因胸腹主动脉瘤破裂死亡。1例发生急性呼吸窘迫综合征（ARDS）后继发心功能衰竭死亡。内脏动脉重建术相关围手术期死亡率为9．1％（1／11）。无一例发生截瘫。术后CTA随访7例,重建内脏动脉共23支全部通畅。结论杂交手术治疗累及内脏动脉的主动脉扩张性病变有效可行。手术方案的演变表明合理的内脏动脉解剖入路、人工血管旁路设计和吻合方式是手术成功的关键因素。     

腹膜后途径行主髂动脉重建的体会

目的总结腹膜后途径行主髂动脉重建的经验体会。方法28例患者在全身麻醉或硬膜外麻醉下接受了腹膜后途径主、髂动脉重建术,其中右侧8例,左侧20例。术式包括腹主动脉瘤切除加人工血管置换;腹主动脉内膜剥脱加补片成形;降主-腹主动脉人工血管转流;腹膜后肿物切除加髂总-股动脉人工血管转流;髂动脉瘤切除加腹主-髂外动脉人工血管转流;腹主-右髂总动脉异物取出;髂总动脉内膜剥脱;腹主-股动脉人工血管转流;髂总动脉．股动脉人工血管转流;髂总．股．胭动脉人工血管转流。术毕腹膜后腔放置胶管引流24例。结果28例患者手术全部成功,围手术期无死亡,术毕重建血管动脉搏动良好。术中出血150—400ml(平均240m1);术中2例患者输血;术后腹膜后腔引流量为50—170ml(平均85m1);术后平均28h拔除胃管。术后除心功能不全、应激性溃疡及腹膜后血肿各1例外,其余患者均未出现明显心、脑、肾、呼吸及消化系统并发症。22例患者随访3个月至2．5年。1例患者术后2年死于急性心梗,1例髂-股-腘动脉转流的患者术后10个月股-腘动脉段转流血管闭塞,1例患者术后近1．5年时虽患肢情况良好,但突发脑出血,其余患者均正常生活。结论腹膜后途径在充分显露主髂动脉的基础上,保证了腹膜腔的完整性,大大降低对胃肠道以及呼吸系统的影响,减少了术后肠麻痹以及呼吸系统并发症,避免了术后肠黏连、机械性肠梗阻的发生,是一种较为简便安全的主髂动脉手术途径。     

胆固醇结石患者胆囊胆汁中凝血和纤溶状态的初步研究

目的：通过研究胆固醇结石患者胆囊胆汁中凝血纤溶状态与交联纤维蛋白生成和降解的关系来探讨胆囊结石的形成机制。方法：收集胆固醇结石（简称胆石）患者胆囊胆汁20份和非胆囊结石患者胆囊胆汁15份,测定胆汁中的纤维蛋白特异性降解产物D－二聚体抗原和部分凝血纤溶因子抗原和活性水平。结果：胆囊结石组建者胆汁中D－二聚本抗原高于非胆囊结石组（P＜0．01）,抗凝血酶Ⅲ抗原高于非胆囊结石组（P＜0．05）,抗凝血酶Ⅲ活性低于非胆石组（P＜0．05）,胆石组抗凝血酶Ⅲ抗原与活性之比与非胆石组相比明显增高（P＜0．01）,胆石组纤溶酶活性较非胆石组增高（P＜0．05）,纤溶酶活性与凝血活性指标之比明显低于非胆石组（P＜0．05）,两组间纤溶酶原激活性抑制活性差异无显著性。结论：胆固醇患者胆囊胆汁中的凝血和行 性均高于非胆石组,但纤溶活性增高的程度与凝血活性比则明显减低,从而使交联纤维蛋白折生成增多,而降解相对减少,导致成石组胆囊胆汁中交联纤维蛋白积累,促进胆囊结石的形成。     

脂多糖对离体大鼠胸主动脉和肺组织HO-1mRNA及蛋白表达的影响

目的 观察离体大鼠胸主动脉和肺组织脂多糖（Lipopolysaccharide,LPS)孵育后血红素氧合酶－1（HO－1）mRNA及蛋白表达时间依从性的变化。方法 24只Wistar大鼠颈椎脱臼处死，取其胸主动脉和肺组织，随机分成四组：对照组（n=6)，实验组包括LPS3、8、24组（均为n=6)，分别与LPS（1μg/ml）孵育3、8、24h。采用蛋白免疫杂交（Western blot）和半定量聚合酶链反应（RT－PCR）分别测定HO－1蛋白和mRNA表达，结果 与对照组相比，胸主动脉HO－1蛋白表达LPS3组即达最高值（P＜0．05），LPS8和LPS24组仍处于较高水平（P＜0．05）；肺组织HO－1蛋白表达LPS3组已开始升高（P＜0．05）,LPS8力LPS24组仍处于较高水平（P＜0．05）；肺组织HO－1蛋白表达LPS3组已开始升高（P＜0．05），LPS8组达最高水平（P＜0．01），LPS24组有下降趋势，但仍与对照组有差异（P＜0．05）。与对照组相比，胸主动脉HO－1mRNA表达LPS3组即达最高值（P＜0．05），LPS8组较LPS3组无明显变化（P＞0．05），而LPS24且则恢复至始水平；肺组织HO－1mRNA表达LPS3组开始升高（P＜0．05），LPS8组达到最大值（P＜0．01），LPS24组回到基础水平（P＞0．05）。结论 脂多糖可以明显促进大鼠胸主动脉和肺组织HO－1mRNA及蛋白表达，且两种组织表现出不同的时间依从性变化，可能与感染性休克体肺循环不同变化的病生理机制有关。     

用明胶替代异体输血对肿瘤病人围术期T淋巴细胞亚群的影响

目的：探讨用血浆代用品3．5％尿素交连明胶（UG）替代异体输血对肿瘤病人围术期T淋巴细胞亚群的影响。方法：将42例直，结肠癌根治术病人随机均分为两组，Ⅰ组术中输入UG500－1000ml代替异体输血；Ⅱ组输异体全血400－600ml。分别于麻醉前，输血或UG前、术后1、3、5、7d抽取静脉血，用流式细胞仪测定T细胞亚群的数量。结果：两组后1、3dCD3^ ,CD4^ 、CD4^ ／CD8^ 均较术前显著减少（P＜0．05或P＜0．01），Ⅱ组较输Ⅰ组减少更明显（P＜0．05）。术后5、7dⅠ组CD3^ 、CD4^ 、CD4^ ／CD8^ 恢复至术前水平，而Ⅱ组仍明显低于术前（P＜0．01）。结果：围术期异体输血严重抑制病人免疫功能，用血浆代品UG替代输血对免疫功能未发现有明显的抑制作用，而且术后免疫功能恢复快，有利于降低术后感染率。     

股静脉至股动脉体外循环下全胸腹主动脉替换术转流经验

目的:回顾分析全胸腹主动脉替换术中应用经股静脉至股动脉转流实施腹腔脏器灌注保护的经验。方法:2016年9月至2020年8月,50例患者接受股静脉至股动脉转流体外循环辅助下全胸腹主动脉替换。男性30例,女性20例,年龄21～69岁,平均(40.5±12.4)岁。早期25例患者单纯应用部分体外循环技术,2019年11月起开...     

Evaluation of spinal cord ischemia in endovascular stent graft repair and surgical operation of descending thoracic or thoracoabdominal aortic aneurysms

Between October 1996 and June 2003, endovascular stent graft repair was performed in 87 patients with descending thoracic aortic aneurysms, graft replacement was performed in 24 patients with thoracoabdominal aortic aneurysms, and endovascular stent graft repair with concomitant surgical bypass of abdominal visceral arteries was performed in 3 patients with thoracoabdominal aortic aneurysms. The retrievable stent graft was inserted and evoked spinal cord potential were monitored in order to predict spinal cord ischemia for stent graft repair. There was no paraplegia or hospital death, although 3 patients had paraparesis in stent graft repair. Two of the 3 patients with paraparesis made a full neurologic recovery. There were no cases of paraplegia or paraparesis in surgical operations with thoracoabdominal aortic aneurysm. The concomitant surgical procedure was a good technique for patients in whom cardiopulmonary bypass could not be used. Our results of stent graft repair and surgical operation for descending thoracic or thoracoabdominal aortic aneurysms were acceptable. The retrievable stent graft was useful for prediction of spinal cord ischemia before endovascular stent graft repair of descending thoracic or thoracoabdominal aortic aneurysm.     

Risk factors reducing blood transfusion requirements in pediatric open heart surgery after introduction of vacuum assisted circuits

OBJECTIVES: Open heart surgery without homologous blood transfusion remains difficult in children. The introduction of vacuum-assisted cardiopulmonary bypass circuits to reduce priming volume for pediatric patients has improved the percentage of transfusion-free operations. We retrospectively analyzed blood transfusion risk factors to further reduce blood transfusion requirements after vacuum-assisted circuit introduction. METHODS: From March 1995 to June 1996, 49 patients weighing between 5 and 20 kg underwent cardiac surgery with cardiopulmonary bypass at our institution, excluding hospital deaths. We retrospectively analyzed risk factors influencing blood use in 37 patients with no blood priming in cardiopulmonary bypass after introducing a vacuum-assisted system. Factors selected for univariate analysis were age, body weight, cyanosis, preoperative Hb, operation time, cardiopulmonary bypass time, aortic cross-clamping time, and intraoperative and postoperative bleeding volume. Correlation between total bleeding volume/body weight and cardiopulmonary bypass time was studied by regression analysis. RESULTS: As risk factors, univariate analysis identified cyanotic disease, longer operation time (> 210 minutes), longer cardiopulmonary bypass time (> 90 minutes), longer aortic cross-clamping time (> 45 minutes), greater intraoperative bleeding volume/body weight (> 4 ml/kg), and greater postoperative bleeding volume/body weight (> 15 ml/kg). Regression analysis showed a significant positive correlation between total bleeding volume/body weight and cardiopulmonary bypass time. CONCLUSIONS: Cyanotic disease and long bypass time are risk factors in reducing blood transfusion requirements in pediatric open heart surgery after introduction of vacuum-assisted circuits. Further efforts are needed, however, to reduce blood transfusion requirements, particularly in these children.     

Immediate ischemic preconditioning based on somatosensory evoked potentials seems to prevent spinal cord injury following descending thoracic aorta cross-clamping.

OBJECTIve: Delayed ischemic preconditioning has demonstrated neuroprotective effects in spinal cord ischemia. We investigated the effects of immediate ischemic preconditioning based on somatosensory evoked potentials monitoring in a model of spinal cord injury due descending thoracic aorta occlusion in dogs. METHODS: Twenty-one dogs were submitted to spinal cord ischemia induced by descending thoracic aorta cross-clamping for 45 min. Control group underwent only the aortic cross-clamping (n=7), group A underwent one cycle of ischemic preconditioning (n=7) and group B underwent three equal cycles of ischemic preconditioning (n=7), immediately before the aortic cross-clamping. Ischemic preconditioning cycles were determined by somatosensory evoked potentials monitoring. Neurologic evaluation was performed according to the Tarlov score at 72 h of follow-up. The animals were then sacrificed and the spinal cord harvested for histopathology. RESULTS: Aortic pressures before and after the occluded segment were similar in the three groups. Ischemic preconditioning periods corresponded to a mean ischemic time of 3+/-1 min and a mean recovery time of 7+/-2 min. Severe paraplegia was observed in three animals in Control group, in four in group A and in none in group B. Tarlov scores of group B were significantly better in comparison to the Control group (P=0.036). Histopathologic examination showed severe neuronal necrosis in the thoracic and lumbar gray matter in animals who presented paraplegia. CONCLUSIONS: Immediate repetitive ischemic preconditioning based on somatosensory evoked potentials monitoring seems to protect spinal cord during descending aorta cross-clamping, reducing paraplegia incidence.     

Case of thoracoabdominal aortic aneurysm complicated with Buerger's disease]

We report a rare case of 65-year-old man who developed thoracoabdominal aortic aneurysm of Crawford type III complicated with Buerger's disease. He was admitted to our hospital with chief complaints of upper abdominal and back pain. CT showed that the aneurysm extended from the descending thoracic aorta to the aortic bifurcation and its had a maximum width of 95 mm. Angiogram (IA-DSA) revealed that both popliteal arteries were occluded slightly above the level of the knee joint, although collateral vessels were visualized. He underwent preliminary graft replacement of the abdominal aorta with the end-to-side supplemental branch for cannulation. Subsequently we performed graft replacement of the thoracoabdominal aorta with reconstruction of the celiac and superior mesenteric arteries and intercostal arteries on under partial cardiopulmonary bypass. This supplemental branch of abdominal aortic graft was useful in preventing ipsilateral leg ischemia. During the reconstruction of the major visceral branches, the branches were perfused selectively via partial extracorporeal circulation. Post operative courses were uneventful without paraplegia and leg ischemia. Angiographic examination revealed excellent hemodynamic results.     

A case report of descending thoracic aortic aneurysm associated with anterior spinal artery syndrome despite no marked ESP changes

A 67-year-old man underwent graft replacement for the descending thoracic aortic aneurysm with the aid of temporary external bypass. Intraoperative evoked spinal potentials (ESPs) were monitored to detect the spinal cord ischemia. Incomplete paraplegia with sensory dissociation was developed in this patient after surgery, despite well maintained ESPs throughout the aortic cross-clamping. ESPs have been widely used as a mean of detecting early impairment of spinal neural conduction during aortic surgery. However, ESPs are principally mediated through posterior and lateral column pathways and they are not always a reliable monitor to predict paraplegia in aortic surgery.     

Cross-clamping of the thoracic aorta. Influence of aortic shunts, laminectomy, papaverine, calcium channel blocker, allopurinol, and superoxide dismutase on spinal cord blood flow and paraplegia in baboons.

There is a high incidence of paraplegia associated with thoracic aortic cross-clamping, even when cardiopulmonary bypass or shunts are used. In 56 adult baboons, spinal cord blood flow (SCBF), vascular anatomy, and paraplegia rates were evaluated. Tissue blood flow was measured by radioactive microspheres. Various procedures were used to increase SCBF and to prevent ischemia-reperfusion injury. It was found that the rate of paraplegia was inversely correlated with neural tissue ischemia (SCBF) and directly correlated with reperfusion hyperemia. Two methods completely prevented paraplegia. These two methods were a thoracic shunt with occlusion of the infrarenal aorta or cerebrospinal fluid drainage plus intrathecal papaverine injection, both of which were associated with an increased SCBF. Furthermore, papaverine dilated the anterior spinal artery (ASA) (p = 0.007) and increased the blood flow through the lower ASA. Whereas procedures utilizing a calcium channel blocker (flunarizine), allopurinol, superoxide dismutase (SOD), laminectomy alone, and a thoracoabdominal shunt not perfusing the arteria radicularis magna (ARM) all failed to prevent paraplegia, allopurinol (p = 0.026) and SOD (p = 0.004) did prevent gastric stress lesions, indicating that their failure to prevent paraplegia was not due to a lack of activity. Of great clinical interest is that, if a shunt is used and the ARM is perfused, infrarenal aortic cross-clamping increases SCBF, thus preventing paraplegia. Intrathecal application of papaverine proved to be even more effective in increasing SCBF and also completely prevented paraplegia. As this is a safer procedure than the insertion of shunts, this is the method of choice for the prevention of paraplegia associated with thoracic aortic cross-clamping. The preliminary trial using intrathecal papaverine in human beings has thus far shown no adverse side effects from the drug, and no paraplegia has occurred.     

Our Distal Aortic Perfusion System in Descending Thoracic and Thoracoabdominal Aortic Aneurysm Repairs

Abstract: We have used heparin-bonded partial cardio-pulmonary bypass to support distal aortic circulation during aortic cross-clamping. However, there were no cardiotomy reservoirs with fully reliable thromboresistance. To resolve this problem, a short-acting anticoagulant (nafamostat mesilate) was added into a cardiotomy reservoir. The present study was designed to evaluate the efficacy of our distal perfusion system. From May 1995 through the end of May 1996, 27 patients underwent descending thoracic and thoracoabdominal aortic aneurysm repairs with this adjunct, 4 being excluded from the experiment. Twenty patients who had undergone conventional partial cardiopulmonary bypass were defined as the control group. There were no significant differences between the 2 groups in the morbidity, mortality, gas transfer, or transfusion requirements despite the fact that more complicated surgical procedures (shown by a two-fold increase in the prevalence of reoperation) were required in the group that had received the current distal perfusion adjunct. the heparin-bonded group. In conclusion, our perfusion system is very effective for descending thoracic and thoracoabdominal aortic aneurysm repairs.     

Longitudinal study of cerebral spinal fluid drainage in polyethylene glycol-conjugated superoxide dismutase in paraplegia associated with thoracic aortic cross-clamping

It has been hoped that pharmacologic prophylaxis in thoracic aortic cross-clamping may avert the unpredictable complication of spinal cord paraplegia, may avoid the mechanical difficulties associated with shunts, partial bypass, or monitoring devices, and may serve as a substitute for or as an adjunct to cerebral spinal fluid drainage. Toward this end 21 mongrel dogs were studied in four groups and underwent 60 minutes of thoracic aortic cross-clamping: group I, five with thoracic aortic cross-clamping; group II, five with thoracic aortic cross-clamping and cerebral spinal fluid drainage; group III, five with thoracic aortic cross-clamping, cerebrospinal fluid drainage and intravenous administration of a single dose (5000 units/kg) of polyethylene glycol-conjugated superoxide dismutase (PEG-SOD) given 15 to 20 minutes before thoracic aortic cross-clamping; and group IV, six with thoracic aortic cross-clamping and PEG-SOD. Paraplegia was graded by the Tarlov method at 24 hours and up to 5 days after thoracic aortic cross-clamping. The carotid and femoral artery pressures, the central venous pressure, and core temperature, taken during the experiment and at the time the dogs were killed, were found to be similar between groups. At 24 hours all dogs in group I were paraplegic; groups II and III had no paraplegic dogs (p less than 0.01), and group IV had fewer paraplegic dogs (two of six) than group I (p less than 0.05). Paraplegia was averted in all dogs treated with cerebral spinal fluid drainage, even 5 days after thoracic aortic cross-clamping.(ABSTRACT TRUNCATED AT 250 WORDS)     

Surgical treatment of aneurysms of the thoracic aorta with the aid of partial cardiopulmonary bypass: an analysis of 95 patients

We retrospectively evaluated the surgical results in 95 patients with aneurysm of the thoracic aorta who were surgically treated using partial cardiopulmonary bypass (CPB) as an adjunctive method during the past 10 years. The cause of the aneurysm was atherosclerosis in 52% and dissection in 41%. Fifty-eight percent of the patients had an aneurysm of the entire descending thoracic aorta and 14 of these patients had a thoracoabdominal aneurysm. Emergency operation was performed in 16 patients (17%). There were 14 early deaths (14.7%) within one month after operation. Postoperative complications included renal dysfunction, partial paraplegia, and hemorrhage. Renal dysfunction occurred in 7 (7.8%) of the operative survivors; 2 of the 7 required hemodialysis. Partial paraplegia was observed in 2 patients undergoing total replacement of the thoracoabdominal aorta. Neither renal dysfunction nor paraplegia was related to the duration of aortic cross-clamping. Postoperative hemorrhage necessitating reopening of the chest occurred in 8 (8.9%) of the operative survivors. Partial CPB is useful in reducing the incidence of postoperative complications among patients undergoing aortic cross-clamping for a long period.     

Left heart bypass using a centrifugal pump as an adjunct measure for surgery of thoracic descending aorta]

We have employed left heart bypass (LHB) using a centrifugal pump with heparin coated tubes as an adjunct measure for surgery of thoracic descending aortic aneurysm in 8 cases. During aortic cross-clamping, LHB was controlled to maintain the distal pressure above 50 mmHg. In 7 cases, hemodynamics were stable and no complication occurred in relation with this method. However, acute heart failure due to coronary insufficiency occurred in one patient, and subsequent cardiopulmonary bypass was required to maintain systemic circulation. LHB provides adequate distal perfusion and proximal decompression in most cases, and it has also contributed to diminution of intraoperative bleeding. However, LHB can not maintain distal perfusion when acute heart failure occurs, which indicates that we have to select another adjunct measures, such as femorofemoral bypass to avoid distal hypoperfusion in cases with heart diseases.