冠状动脉旁路移植术后旁路血管狭窄影响因素分析

目的总结冠状动脉旁路移植术(CABG)后旁路血管造影特点,分析相关因素对旁路血管通畅率的影响,并探讨提高旁路血管通畅率的方法。方法2004年4月至2006年4月间CABG术后平均间隔(46.4±39.1)个月,因心绞痛复发再入院行冠状动脉造影(CAG)病人149例,男120例;平均年龄(61.0±10.1)岁。共444支旁路血管,其中左乳内动脉(LIMA)131支,大隐静脉(SV)295支,左桡动脉(RA)15支,右乳内动脉(RIMA)3支。旁路血管造影完全闭塞或狭窄≥75%视为旁路血管病变。结果本组65.1%(97/149例)病人有旁路血管病变。31.1%(138/444支)旁路血管发生病变。LIMA闭塞5.3%(7/131支),狭窄(≥75%)6.9%(9/131支);SV旁路血管闭塞31.9%(94/295支),狭窄7.5%(22/295支);RA旁路血管闭塞33.3%(5/15支);RIMA旁路血管闭塞33.3%(1/3支)。LIMA旁路血管的通畅率明显优于SV。不同靶血管的SV旁路血管通畅率有明显差别。吻合口以远冠状动脉口径(runoff)≥2.0 mm的旁路血管通畅率明显高于<2.0mm者,尤其是SV旁路血管。近端冠状动脉狭窄程度对LIMA-前降支的通畅率影响明显,而对主动脉-SV-后降支通畅率影响不明显。序贯吻合及非体外循环CABG对旁路血管通畅率无明显影响。结论CABG术后旁路血管病变比较常见,是造成术后心绞痛复发的重要原因。不同旁路血管、不同靶血管、runoff大小、近端冠状动脉狭窄程度均明显影响旁路血管通畅率。手术技术不当是术后早期旁路血管病变的主要原因。改进手术技术,术后早期足量抗血小板药物及强化降脂治疗是提高旁路血管通畅率的关键。     

冠状动脉旁路移植术的中远期效果随访

目的 分析冠状动脉旁路移植术(CABG)的中、远期疗效.方法 CABG术后行多层螺旋CT(MDCT)复查42例,行冠状动脉造影(SCA)复查59例;平均随访(66.79±44.27)个月.其中动脉旁路血管115支,静脉旁路血管195支.分别计算旁路血管的通畅率,比较其间的差异.结果 行MDCT复查者随访(53.93±36.80)个月,LIMA、RA、SV和CV的通畅率分别为94.7%、92.0%、85.9%和60.0%;有心绞痛再发组为83.5%,无心绞痛再发组为95.2%,差异有统计学意义.SCA复查者随访(75.95±47.09)个月,LIMA、RA、SV和CV的通畅率分别为87.1%、81.0%、53.6%和57.1%;有心绞痛再发组为62.0%,无心绞痛再发组为100.0%,差异有统计学意义.结论 MDCT可以作为一种无创检查方法来评价CABG术后旁路血管的通畅情况;动脉旁路血管的中、远期通畅率较静脉高;旁路血管病变是导致术后再发心绞痛的重要原因;旁路血管病变程度与CABG术后的随访时间密切相关.     

机器人非体外循环冠状动脉旁路移植术

目的 总结使用da Vinci S机器人系统完成的微创机器人非体外循环冠状动脉旁路移植术(CABG)的技术特点和临床效果.方法 2007年4月至2008年12月,共有56例患者接受微创机器人非体外循环CABG.所有患者术前均有心绞痛症状,冠状动脉造影显示严重的前降支病变,10例患者合并有回旋支或右冠状动脉病变.其中25例患者有心肌梗死病史.心功能(NYHA分级)Ⅱ级45例,Ⅲ级11例,平均射血分数为57%±11%.所有患者肺功能良好,无胸膜炎和左侧胸腔手术史.术前常规行64排CT检查双侧胸廓内动脉(ITA)的解剖情况.共采用三种术式:(1)机器人单侧或双侧ITA游离并同期小切口非体外循环CABG;(2)全机器人非体外循环CABG;(3)对合并有回旋支或右冠状动脉局限性狭窄的患者,接受上述两种术式的一种后行分站式支架置入杂交术.行单支或多支CABG时于左侧胸壁第4肋间做长6 cm的小切121,直视、心脏跳动下行ITA和前降支的吻合;行全机器人非体外循环CABG时无需胸壁切口.术后以冠状动脉造影或64排CT评估桥血管的通畅性,并进行随访.结果 所有患者成功接受了上述手术.术中平均ITA桥血流量为(23.2±16.7)mL/min,无中转开放手术和手术死亡.ITA移植到前降支53例,双支桥3例,其中10例患者旁路移植后接受了回旋支或右冠状动脉的支架植入杂交术.术后复查未见桥血管狭窄或闭塞.结论 微创机器人非体外循环CABG手术效果确实、可靠,不破坏胸腔骨性结构、创伤小,是微创CABG的发展方向之一.     

非体外循环与体外循环冠状动脉旁路移植血管中远期通畅率比较

目的 比较非体外循环不停跳与体外循环冠状动脉旁路移植手术后中远期移植血管的通畅率.方法 对同一术者行冠状动脉旁路移植手术后5年以上病例50例.按手术方式分为两组.第1组采用传统体外循环下进行冠状动脉旁路移植(体外循环组,25例);第2组采用非体外循环不停跳技术进行冠状动脉旁路移植(非体外循环组,25例).对所有病例进行冠状动脉造影随访,比较两组移植血管的通畅情况.结果 两组均男21例,女4例.第1组手术年龄(55.4±8.9)岁;随访70～110个月,平均(86.52±12.48)个月;移植血管共83支,其中动脉移植血管41支,静脉移植血管42支,平均移植血管(3.32±0.63)支/例;随访移植血管通畅61支,狭窄6支,闭塞16支,动脉移植物通畅率为78.05%,静脉通畅率69.05%,总通畅率73.49%.第2组手术年龄(58.2±9.09)岁;移植血管共65支,其中动脉移植血管31支,静脉移植血管34支,平均移植血管(2.52±0.71)支/例,随访64～99个月,平均(82.68±12.48)个月;随访移植血管通畅47支,狭窄4支,闭塞14支,动脉移植物通畅率为74.19%,静脉通畅率70.59%,总通畅率72.31%.结论 非体外循环不停跳冠状动脉旁路移植手术移植血管中远期通畅率与传统体外循环手术一致,均可达到较好的中远期疗效.

Abstract：

Objective Off-pump coronary artery bypass grafting (OPCAB) is used more widely in recent years in China. However, there is an argument on benefits and risks of off-pump surgery. Many studies shown that OPCAB had more benefits in short-term outcomes than conventional coronary artery bypass grafting(CCABG). But evidences from other studies suggested that OPCAB resulted in less long-term graft patency as compared with on-pump surgery. This study examined the longterm graft patency of OPCAB and CCABG performed by one surgeon. Methods 50 patients who had received surgical revascularization by a surgeon for more than 5 years were reviewed, 25 patients received conventional coronary artery bypass grafting ( group 1 ) and 25 patients received OPCAB ( group 2). All patients had angiograms for compareing the graft patency between the two groups. Results Among 25 patients in group 1,21 were male and 4 were female. The mean age of patients at surgery was (55.4 ±8.9) years. 15 cases had unstable angina, 16 patients had old myocardial infarction and 6 cases had diabetes.The ejection fraction (EF) was 0.58 ±0.14. The mean number of bypasses per patient was 3.32 ±0.63. Mean duration of operation was (3.58 ± 0. 82) hours. Mean follow-up duration was ( 86.52 ± 12.48) months. 83 grafts were evaluated for patency ( open vs. closed) and were graded by Fitzgibbon as grade A ( excellent graft), B ( impaired graft, with a stenosis of ≥50%, or a diameter less than 50% of the grafted artery), or O ( completely occluded). The graft patency was 73.49%, 61grafts were graded as Fitzgibbon A, 6 grafts as Fitzgibbon B and 16 grafts as Fitzgibbon 0. 25 patients were in group 2, 21males and 4 females. The mean age of patients at procedure was (58.2 ± 9.09) years, 11 patients had unstable angina, 13 patients had old myocardial infarction and 6 cases had diabetes. The ejection fraction (EF) was 0.59 ± 0. 14. Conclusion No 2011.03.013 difference in long-term graft patency was identified between on-pump and off-pump coronary artery bypass grafting. Off-pump oronary artery bypass grafting preformed by an experienced surgeon may gain similar long-term graft patency to that of conventional bypass.     

二次冠状动脉旁路移植术的临床疗效

目的 评价二次冠状动脉旁路移植术的临床疗效.方法 51例病人(占医院同期进行冠状动脉旁路移植术病人的2.5%)进行二次冠状动脉旁路移植术,距首次手术(15.1±5.8)年.10例采用非体外循环冠状动脉旁路移植术(OPCABG),41例采用体外循环冠状动脉旁路移植术(CABG).正中切口43例,左胸侧切口8例.结果 3例行CABG病人手术后呼吸衰竭,需呼吸机辅助.所有病人住ICU(2.2±0.7)天,住院(9.2±2.4)天.术后死亡2例(3.9%),采用OPCABG和CABG者各1例,死亡原因分别为急性心肌梗死、低心排血量综合征和呼吸功能衰竭、重症肺炎.完全再血管化44例,其中行OPCABG者6例,CABG者38例.部分再血管化7例,行OPCABG者4例,CABG者3例.结论 CABG和OPCABG行二次冠状动脉旁路移植术均安全,疗效满意,能达到完全再血管化的目的.     

乳内动脉在70岁以上患者冠状动脉旁路移植手术中的应用

目的 总结70岁以上患者冠状动脉旁路移植手术中应用乳内动脉的利弊.方法 2010年7月1日至2012年8月20日,1471例70岁以上患者行单纯冠状动脉旁路移植手术共,占同期6156例单纯CABG手术者的23.10％.其中男1030例,女441例,年龄(73.3±3.9)岁.1395例采用非体外循环冠状动脉旁路移植术(off-pump CABG),76例采用体外循环(on-pump CABG),其中12例采用体外循环不停跳(on-pump beating heart CABG).旁路移植移植旁路血管(3.12±0.68)支.按移植血管材料分为2组:A组:564例全部应用大隐静脉;B组:907例患者应用左乳内动脉建立与左前降支旁路移植手术,其中42例应用桡动脉及胃网膜右动脉进行全动脉化旁路移植手术,其余靶血管均应用大隐静脉作为血管移植物旁路移植.结果 A组死亡12例(2.12％),B组死亡19例(2.09％),组间差异无统计学意义.B组术后早期引流量明显高于A组,二次开胸止血、恶性心律失常、脑卒中、伤口愈合不良和IABP使用例数等指标两组之间差异均无统计学意义.结论 70岁以上高龄患者旁路移植冠状动脉旁路移植选择左乳内动脉作为左前降支的旁路移植旁路血管材料,不增加手术死亡和术后严重并发症的发生率.乳内动脉在远期通畅率方面的优势明显,建议70岁以上高龄患者旁路移植优先选择左乳内动脉作为左前降支的旁路移植旁路移植血管.     

再次冠状动脉旁路移植术的临床应用

目的总结再次冠状动脉旁路移植术(CABG)治疗冠心病的临床经验和手术效果。方法2001年6月～2006年12月,对18例冠心病患者行再次CABG。术前心绞痛(CCS分级)级7例,级11例;冠状动脉造影显示:16例均有原移植静脉狭窄/闭塞,2例左乳内动脉(LIMA)-左前降支(LAD)桥狭窄/闭塞,6例自体冠状动脉出现新的病变。全组均经原胸骨正中切口径路手术,常规体外循环(CPB)下CABG15例,非体外循环冠状动脉旁路移植术(OPCAB)3例;同期行室壁瘤切除、左心室成形1例,二尖瓣成形术3例,主动脉瓣和二尖瓣双瓣膜置换联合右颈动脉内膜剥脱术1例。应用LIMA12例次、双侧IMA4例次、桡动脉3例次,其余为大隐静脉或小隐静脉。结果15例常规CABG患者主动脉阻断时间45～112min(57±26min),CPB时间66～140min(78±24min)。再次CABG每例移植血管1～5支,平均每例远端吻合口3.11个。手术结束用血流仪测定移植血管血流量均满意(血流量27.0±12.5ml/min),搏动指数均<4.2。手术后因低心排血量需主动脉内球囊反搏辅助1例,术后6d发生肾功能衰竭死亡。其余17例患者术后呼吸机辅助呼吸时间5～15h,心绞痛均消失,围手术期无心肌梗死发生,胸腔引流量为290～1040ml,顺利恢复,均出院。术后随访17例,随访时间6.0个月～4.5年,均无心绞痛发作,4例复查冠状动脉造影,显示移植血管均通畅。结论再次CABG难度大于首次CABG,但只要手术中能正确找到靶血管,移植血管的血流可靠、完全再血管化和有良好的围术期管理,再次CABG可达到与首次手术同样的效果。     

胸骨下段正中小切口在冠状动脉旁路移植术中的应用

目的总结162例胸骨正中下段小切口行冠状动脉旁路移植手术的经验. 方法 1998年4月～2003年6月,经胸骨下段正中小切口行冠状动脉旁路移植手术162例,包括体外循环下冠状动脉旁路移植术(coronary artery bypass grafting, CABG)77例,CABG联合心内手术13例,非体外循环CABG(off-pump coronary artery bypass grafting, OPCABG)72例. 结果手术死亡1例(0.6%),再手术1例(0.6%),术后并发症9例(5.6%).体外循环手术的主动脉阻断、体外循环及手术时间分别为(74.8±23.1) min、(113.6±31.3) min及(255.5±54.5) min.非体外循环手术时间(195.6±50.6) min.吻合口数目1～5个,(2.4±0.7) 个.术后气管插管时间0～364 h,中位数11 h;恢复室时间1～28 d,中位数3 d;术后住院5～60 d,中位数10 d.胸腔引流量(607.2±443.0) ml,按体重计算为(8.6±6.0) ml/kg.38例输血,输血量(1 161.3±741.2) ml. 结论胸骨正中下段小切口行冠状动脉旁路移植手术创伤小,安全可靠;皮肤切口小;无须特殊器械,操作简单,可获得冠状动脉多支病变充分再血管化的效果,可同时进行其他心内手术.     

70岁以下多支冠状动脉病变患者体外与非体外循环冠状动脉旁路移植术的比较

目的比较非体外循环冠状动脉旁路移植术(off-pump CABG)与体外循环冠状动脉旁路移植术(on-pump CABG)治疗70岁以下多支冠状动脉病变患者的疗效,为其手术术式选择提供依据。方法 2007年6月至2009年6月,共收治了196例70岁以下多支血管病变患者,其中男152例,女44例;年龄46～69岁,平均年龄55.00岁。根据采用的手术术式不同,将196例患者分为两组,off-pump CABG组:94例,on-pump CABG组:102例。比较两组患者移植血管的种类和支数、术中输血量、术后呼吸机辅助时间、住院时间、围术期并发症发生率及病死率等。结果 off-pumpCABG组中有2例患者术中因循环不稳定改为on-pump CABG,最终有1例死于多器官功能衰竭。on-pumpCABG组术后死于严重低心排血量和心脏骤停各1例。两组移植血管材料、围术期并发症发生率和病死率差异无统计学意义(P0.05);而术中off-pump CABG组远端吻合口数量(3.22±0.65个vs.4.52±1.11个,t=9.807,P=0.000)、输血量(312.57±305.26mlvs.744.86±279.37ml,t=10.317,P=0.000)、术后呼吸机辅助时间(10.71±5.32hvs.17.12±4.67h,t=8.683,P=0.000)、住院时间(17.75±3.04dvs.21.24±6.46d,t=4.782,P=0.000)少于或短于on-pump CABG组。off-pump CABG组随访93例,on-pump CABG组随访100例,随访时间2～26个月。所有随访患者均生存,无心绞痛发作。结论 on-pump CABG和off-pump CABG治疗70岁以下多支冠状动脉病变患者的早期临床疗效差异无统计学意义,但on-pump CABG组血管化比较完全。off-pump CABG目前仍不能取代on-pump CABG,而远期预后仍有待长期随访观察。     

冠状动脉旁路移植术后移植血管通畅率的影响因素分析

目的分析冠状动脉旁路移植术(CABG)后1年移植血管通畅率及危险因素。方法前瞻性连续纳入哈尔滨医科大学附属第一医院2010年6～12月行CABG患者71例,其中男37例,女34例;年龄(59.8±7.7)岁,由同一术者主刀完成手术,术后用标准药物治疗。术后1年行冠状动脉256排多层螺旋CT检查,根据移植血管通畅与否,将患者分为闭塞组(n=16)和通畅组(n=55)。收集术前、术中和术后随访资料,通过单因素分析和logistic多因素回归分析筛选导致移植血管病变的危险因素。结果术后1年移植血管通畅率为91.0%(172/189)。单因素分析结果显示,术前胆固醇水平(t=-2.389,P=0.017)、血管弥漫性病变(χ2=4.449,P=0.042)、靶血管直径(t=5.064,P=0.000)、术后未规范服用抗血小板药物(χ2=10.175,P=0.008)是移植血管病变的潜在危险因素。logistic多因素回归分析结果显示,靶血管狭窄[RR=0.014,95%CI(0.001,0.228),P=0.003]和术后未规范服用抗血小板药物[RR=13.375,95%CI(1.075,175.536),P=0.044]是移植血管病变危险因素。结论 CABG患者术后1年移植血管通畅率较高,移植血管通畅率与靶血管狭窄及术后抗血小板药物的规范服用相关。     

体外循环与非体外循环下冠脉搭桥术患者术中血液动力学的比较

目的比较体外循环(CPB)与非CPB下冠脉搭桥术患者术中血液动力学的变化。方法同期行CPB下冠状动脉搭桥术(CABG)与非CPB下冠状动脉搭桥术(OPCAB)患者各70例,分别为CABG组和OPCAB组,分别在麻醉诱导后手术开始前(术前)和术毕用Swan-Ganz导管监测血液动力学指标。结果与术前比较,两组术毕心率(HR)、平均动脉压(MAP)、肺动脉平均压(PAMP)、肺毛细血管嵌压(PAWP)、中心静脉压(CVP)及左室作功指数(LVSWI)差异无统计学意义(P>0.05),心输出量(CO)、心脏指数(CI)均升高;OPCAB组术毕心搏指数(SVI)升高,体循环阻力指数(SVRI)、肺循环阻力指数(PVRI)降低(P<0.05),CABG组术毕SVI、SVRI、PVRI差异无统计学意义(P>0.05);与CABG组比较,OPCAB组术毕SVRI、PVRI降低(P<0.05)。结论两组患者术后心功能均得到了改善,OPCAB 组在改善心功能、降低体、肺循环阻力方面,优于CABG组。     

高风险冠心病患者接受体外或非体外循环冠状动脉旁路移植术的临床对比研究

目的比较体外循环冠状动脉旁路移植术（on—pump coronary artery bypass grafting，on—pump CABG）和非体外循环冠状动脉旁路移植术（off—pump CABG）治疗高风险冠心病患者的临床疗效。方法2003年10月～2007年10月，共对290例高风险[心脏手术风险评估欧洲系统（EuroSCORE）≥6分]冠心病患者实施CABG术，其中on—pumpCABG140例，offpumpCABG150例。比较2组手术死亡率、再血管化指数、桥血流量、呼吸机支持时间、二次开胸率、引流量、输血量及肾功能变化。结果2组在死亡率、再血管化指数、桥血流量、二次开胸率、术后脑梗塞率和心房纤颤率方面无统计学差异（P〉0．05）。与on—pumpCABG组相比，off-pumpCABG组呼吸机支持时间短[（4．8±1．9）h vs（8．9±2．1）h，t=17．453，P=0．000]，引流量少[（660±111）ml vs（660±111）ml，t=17．173，P=0．000]，输血量少[（270±77）ml vs（510±144）ml，t=17．861，P=0．000]，肾功能损害少[2．0％（3／150）VS7．9％（11／140），X^2=5．407，P=0．020]。结论较on—pump CABG，off-pump CABG治疗高风险冠心病患者的疗效同样确切，并且能显著减少呼吸机使用时间、引流量、输血量以及肾脏损害，更加适用于高风险冠心病患者。     

Off-pump coronary artery bypass

OBJECTIVES: Off-pump coronary artery bypass grafting (CABG) on the beating heart has become popular procedure in cardiac surgery and its initial results appeared favorable. We report our early and mid-term results of off-pump CABG performed at Shin-Tokyo Hospital. METHODS: Medical records of patients undergoing off-pump or conventional on-pump CABG from September 1, 1996, to August 31, 1999 were retrospectively reviewed. Patients underwent off-pump CABG were further classified into 2 groups; MIDCAB (Off-pump CABG for single vessel revascularization via a small skin incision) and OPCAB (off-pump CABG mainly approached via midline sternotomy) group. Their preoperative, perioperative, and follow-up data were collected and analyzed. RESULTS: Among a total of 995 cases of CABG, 194 cases were off-pump CABG (male/female 142/52, mean age 66.9). The mean number of distal anastomoses in off-pump CABG was 1.9 +/- 0.9 (1.0 +/- 0.0 in MIDCAB and 2.3 +/- 0.7 in OPCAB), which was significantly fewer than in on-pump CABG (3.6 +/- 1.1), with p < 0.0001. Intubation time (5.3 +/- 5.7 hours in off-pump CABG vs 13.1 +/- 24.2 hours in on-pump CABG), ICU stay (1.7 +/- 1.1 vs 3.2 +/- 3.0 days), and postoperative hospital stay (14.0 +/- 7.9 vs 18.1 +/- 12.1 days) in off-pump CABG were significantly shorter than in on-pump CABG (p < 0.0001). In the off-pump CABG group, there were no in-hospital deaths and 14 major complications, fewer than in on-pump CABG (8 hospital deaths and 114 major complications). Postoperative angiography before hospital discharge was conducted in 80 patients (41.2%) and showed 2 occlusions, giving a graft patency rate of 98.6% in the off-pump group. During follow-up (0.9 +/- 0.6 year) period, there were 5 non-cardiac deaths and 20 cardiac events in the off-pump group. The actuarial survival rate at 36 months was 94.6% for off-pump CABG, showing no significant difference from the rate for conventional CABG patients (95.2% at 36 month, p = NS) The event-free rate was 84.0% at 36 months in off-pump CABG patients; however, which was less favorable than on-pump CABG patients (88.0% at 36 months, p < 0.05). CONCLUSIONS: Both in-hospital and mid-term results for off-pump CABG patients were acceptable. Isolated CABG can thus be safely performed without cardiopulmonary bypass. Advances in coronary stabilization have contributed to these improved results. The observed long-term cardiac events may be related to incomplete revascularization.     

Beating heart coronary artery bypass grafting

Objectives: We have studied the results of 402 consecutive cases of beating heart coronary artery bypass grafting (CABG) and evaluated the usefulness of gastroepiploic artery (GEA) composite grafts. Methods: Between March 1993 and August 2001, 402 patients underwent beating heart CABG. They were 321 male and 81 female patients, aged 17 to 88 (mean 66) years. Beating heart CABG was facilitated by mechanical stabilization with a doughnut stabilizer, a newly designed sternal retractor and a new coronary perfusion system. Minimally invasive direct coronary artery bypass (MIDCAB) was performed in 206 patients (the MIDCAB Group), and beating heart CABG with median sternotomy (OPCAB) was performed in 196 patients (the OPCAB Group). Results: Definite off-pump CABG was accomplished in 381 patients. 21 patients (5%) were converted to on-pump beating heart CABG using percutaneous cardiopulmonary system via femoral vessels because of hemodynamic instability. There was 1 operative mortality (0.2%). There was perioperative myocardial infarction in 2 (0.5%), and cerebral infarction in 3 (0.7%). The rate of complete revascularization was 78% in the MIDCAB Group and 97% in the OPCAB Group. The mean number of anastomoses was 1.6 in the MIDCAB Group and 3.3 in the OPCAB Group. The early graft patency was 99.1% in a left internal thoracic artery graft, 97.0% in a right internal thoracic artery graft, 96.5% in GEA, 98.2% in a radial artery graft, and 94.2% in a vein graft. A GEA composite graft was used in 55 of the 168 patients who received GEA grafting. The mean number of anastomoses for the GEA composite graft was 1.6±0.6 per patient. The graft patency rate was 94.6% (53/56) for GEA and 98.6% (72/73) for the radial artery used as a composite graft. Conclusion: A consecutive series of beating heart CABG was performed safely and effectively with a low mortality rate and low morbidity rate. Beating heart CABG could be performed in all patients, and definite off-pump CABG was accomplished in 95% of them. In order to aim for complete revascularization, GEA composite graft was found to be effective since it required a low mean number of 1.6 anastomoses and a satisfactory patency rate at the same time. Read at the Fifty-fourth Annual-Meeting of the Japanese Association for Thoracic Surgery, Panel discussion, Osaka, October 3–5, 2001.     

Intraoperative assessment and quantification of coronary artery graft patency performed on or off cardiopulmonary bypass

Within the last 10 years, the incorporation of off-pump coronary artery bypass grafting (OPCAB) into many surgical practices has grown. OPCAB requires the surgeon to operate on a beating heart, and it is generally accepted that OPCAB procedures are more technically demanding. Concerns of possible incomplete revascularizations and decreased graft patency have been noted in the literature. The objective of this study was to evaluate and compare on-pump and off-pump intraoperative coronary artery bypass graft (CABG) flow parameters. Intraoperative flow studies conducted with the Butterfly (Medi-Stim Norge AS, Oslo, Norway) flow meter were analyzed retrospectively on 74 patients. Comparisons were completed between patient groups having had their revascularizations performed on or off cardiopulmonary bypass. Our study revealed significant differences in the mean flow rate through saphenous vein grafts (SVG) to the obtuse marginal artery (OM; p = .014), to the diagonal artery (Diag; p = .003), to the right coronary artery (RCA; p = .001), and to the posterior descending artery (PDA; p = .001). Total blood product use showed significantly increased use of both platelets (PLTs) and cryoprecipitate (Cryo) in the on-pump group (p = .027 and .012, respectively). No differences were found for transfusions of red blood cells (RBCs) or fresh frozen plasma (FFP). Additional findings showed a significantly decreased median length of stay (LOS) for the off-pump group. The on-pump patients had a median hospital stay of 7 days (range, 4-24 days), whereas the off-pump patients had a median stay of 6 days (range, 3-22 days; p = .049). Although we were able to show some significance in the mean flow data supporting increased graft flow with the on-pump technique, we were not able to show an overall increase in all recorded flow characteristics to support one method over another.     

Off-pump coronary artery bypass may decrease the patency of saphenous vein grafts

BACKGROUND: There is concern that a hypercoagulable status is caused after coronary artery bypass grafting without cardiopulmonary bypass (off-pump coronary artery bypass grafting, or OPCAB) and may potentially endanger the patency of the anastomosis. The aims of this study were: (1) to compare 1-year graft patency after OPCAB with that of conventional coronary artery bypass grafting (CABG) and that of on-pump beating CABG; and (2) to demonstrate any differences in patency of various conduits among the three groups. METHODS: We analyzed the results of 122 consecutive OPCAB cases (group 1) compared with those of 65 consecutive conventional CABG cases (group II) and those of 19 consecutive on-pump beating CABG cases (group III). In group I, coronary angiography (CAG) was performed immediately postoperatively and 1 year after surgery. In groups II and III, CAG was performed 1 year after surgery. Graft patency was graded as grade A (excellent), grade B (fair), or grade O (occluded). RESULTS: The average number of distal anastomoses in groups I, II, and III were 3.1 +/- 1.1, 3.7 +/- 0.9, and 3.6 +/- 0.9, respectively. In group I, postoperative CAG was performed in 92% of patients (112/122) before discharge. The patency rate (grade A + B) was 96.4% (162/168) for arterial grafts, and 85.6% (160/187) for saphenous vein grafts (SVG). One-year follow-up CAG was performed in 74% of patients (90/122). The patency rate was 97.8% (132/135) for arterial grafts and 67.9% (106/156) for SVG. In group II, 1-year follow-up CAG was performed in 65% of patients (42/65). The patency rate (grade A + B) was 93.5% (43/46) for arterial grafts and 88.3% (98/111) for SVG. In group III, 1-year follow-up CAG was performed in 89% of patients (17/19). The patency rate (grade A + B) was 100% (19/19) for arterial grafts and 86.8% (33/38) for SVG. CONCLUSIONS: Our results demonstrate that the patency rate ot SVG after OPCAB was significantly lower than that of arterial grafts in the early postoperative CAG (p < 0.001), and was also significantly lower than those of SVG of group II (p < 0.001) and group III (p < 0.01) in the postoperative 1-year CAG, although there was no significant difference in 1-year patency of arterial grafts among the three groups. Our data suggest that a specific perioperative anticoagulant therapy may be advisable in patients undergoing OPCAB with SVG.     

弥漫性冠状动脉病变的外科治疗

目的总结非体外循环心脏跳动下冠状动脉内膜剥脱后行非体外循环冠状动脉旁路移植术（off—pump CABG）治疗弥漫性冠状动脉病变的早期临床结果和经验，以提高手术疗效。方法2003年5月～2006年11月，对83例弥漫性冠状动脉病变患者在非体外循环下做冠状动脉内膜剥脱后行off—pump CABG，其中男61例，女22例；年龄55-80岁（65±7岁）；加拿大心脏病协会（CCS）心绞痛分级：Ⅱ级7例，Ⅲ级20例，Ⅳ级56例。有心肌梗死史36例（43．4％）。冠状动脉造影显示：双支血管病变5例，3支病变78例，其中合并左主干病变16例。左心室射血分数25％～65％（51％±16％）。83例共行110支冠状动脉内膜剥脱，其中左前降支系统67支，回旋支、钝缘支9支，右冠状动脉系统34支。20例内膜剥脱后先用大隐静脉片行左前降支成形，再在补片上用乳内动脉行旁路血管移植；应用左乳内动脉83支，桡动脉2支，余均为大隐静脉，每例移植血管3．9±1．2支。结果无手术死亡。术中移植血管血流满意101支（92％），血流量为22±16ml／min。术后发生心肌梗死4例，梗死面积小，无血流动力学改变，未给予特殊治疗。83例患者皆痊愈出院。随访75例（90．4％），8例失访，随访时间8～50个月，无心绞痛发作。8例患者在手术后3～29个月复查冠状动脉造影显示：冠状动脉内膜剥脱后行off—pump CABG的移植血管均通畅。结论非体外循环下冠状动脉内膜剥脱后行off—pump CABG，安全可行，再血管化程度高，是治疗弥漫性冠状动脉病变的有效方法。     

Efficacy of off-pump coronary artery bypass grafting for the patients on chronic hemodialysis

OBJECTIVE: Coronary artery bypass grafting (CABG) under a beating heart is reported to be less invasive and promise earlier recovery. This study was performed to evaluate the efficacy of off-pump CABG in patients with end-stage renal failure. METHODS: Isolated CABG was performed on 40 hemodialysis patients at Shin-Tokyo Hospital Group between September 1, 1993, and December 31, 2000. Among them, off-pump CABG was performed in 16 and on-pump CABG in 24. Their preoperative, perioperative, and follow-up data were retrospectively collected. RESULTS: Patient's demographics and coronary risk factors were similar in off-pump and on-pump groups. The mean number of bypass grafts was 1.9 +/- 1.1 in the off-pump group and 2.8 +/- 1.1 in the on-pump group (P < 0.05). Blood transfusion was significantly less frequent in the off-pump group than in on-pump group. Postoperative complications were more frequently observed in the on-pump group (7.1% off-pump vs 25.0% on-pump). There were two hospital deaths in the on-pump group and none in the off-pump group. Postoperative intubation time, ICU stay, and hospital stay were significantly shorter in the off-pump group than in the on-pump group. Although follow-up period was short (1.1 +/- 0.7 years), no cardiac events occurred in the off-pump group. CONCLUSIONS: Off-pump CABG for hemodialysis patients is safe and useful and it enables early recovery. Postoperative cardiac events were controlled effectively during the short period of follow-up.