楊牟 石吉華 滕靜 李魯濱 車海杰
[摘要] 感染性腹主動(dòng)脈瘤(IAAA)是腹主動(dòng)脈瘤一種特殊類型,是由致病微生物直接或間接感染腹主動(dòng)脈所引起的假性動(dòng)脈瘤,較難愈合,破裂風(fēng)險(xiǎn)高,病死率高,預(yù)后極差。目前,IAAA的外科手術(shù)治療方案主要有解剖外途徑血管重建、原位血管重建和覆膜支架腔內(nèi)隔絕術(shù)等。本文主要綜述了IAAA各種手術(shù)方式的適應(yīng)證、優(yōu)缺點(diǎn)以及療效,以期為臨床醫(yī)生提供更多的治療方案,有利于臨床醫(yī)生更準(zhǔn)確地把握各種手術(shù)方式的適應(yīng)證,從而為病人提供更好的個(gè)體化治療。
[關(guān)鍵詞]?主動(dòng)脈瘤,腹;動(dòng)脈瘤,感染性;修復(fù)外科手術(shù);綜述
[中圖分類號]?R543.16
[文獻(xiàn)標(biāo)志碼]?A
[文章編號]??2096-5532(2019)06-0739-04
doi:10.11712/jms201906027
[開放科學(xué)(資源服務(wù))標(biāo)識碼(OSID)]
感染性腹主動(dòng)脈瘤(IAAA)是一種特殊類型的腹主動(dòng)脈瘤,其發(fā)病率占所有腹主動(dòng)脈瘤的0.85%~1.30%[1-4]。IAAA的主要病因是致病微生物直接或間接感染腹主動(dòng)脈,導(dǎo)致血管損傷,形成假性動(dòng)脈瘤,故這種動(dòng)脈瘤較難愈合,破裂風(fēng)險(xiǎn)高,病死率高,預(yù)后極差。IAAA最常見的致病菌是沙門菌、葡萄球菌、大腸桿菌和克雷伯菌等[5-8]。該病典型的臨床癥狀是發(fā)熱、腹痛或腰背部疼痛、腹部搏動(dòng)性包塊組成的“三聯(lián)征”,但臨床上具有該典型癥狀的病人只有18%。因此,IAAA早期診斷很困難,對于那些有持續(xù)發(fā)熱、腹痛或腰背部疼痛的病人,可通過CTA、B超、MRI檢查來初步診斷[[9-13]。該病外科治療經(jīng)典手術(shù)方式是切除感染性動(dòng)脈瘤,徹底清除鄰近的感染壞死組織,實(shí)施解剖或非解剖途徑的人工血管移植術(shù),結(jié)合圍手術(shù)期應(yīng)用抗生素治療。近年來主動(dòng)脈腔內(nèi)修復(fù)術(shù)的應(yīng)用逐漸增多,且取得了較好的療效。檢索國內(nèi)外文獻(xiàn),目前IAAA的外科手術(shù)治療方案主要有解剖外途徑血管重建、原位血管重建和覆膜支架腔內(nèi)隔絕術(shù)等。本文主要對IAAA各種手術(shù)方式的適應(yīng)證、優(yōu)缺點(diǎn)以及療效進(jìn)行綜述,以期為臨床醫(yī)生提供更多的治療方案,有利于臨床醫(yī)生更準(zhǔn)確地把握各種手術(shù)方式的適應(yīng)證,從而為病人提供更好的個(gè)體化治療。
1?解剖外途徑血管重建
1.1?腹主動(dòng)脈結(jié)扎、腋動(dòng)脈雙側(cè)股動(dòng)脈人工血管旁路移植術(shù)
該術(shù)式為動(dòng)脈瘤體切除,徹底清除感染灶,橫斷腹主動(dòng)脈、結(jié)扎遠(yuǎn)端,腋動(dòng)脈雙側(cè)股動(dòng)脈人工血管旁路移植術(shù)重建雙下肢動(dòng)脈,術(shù)后長期應(yīng)用抗生素。多數(shù)學(xué)者認(rèn)為,該術(shù)式的優(yōu)點(diǎn)是徹底地清除了感染灶,并且避開了感染灶進(jìn)行血管重建,可有效控制感染,但其手術(shù)時(shí)間長、創(chuàng)傷大,遠(yuǎn)期效果并不盡人意,術(shù)后可發(fā)生人工血管感染、吻合口漏、主動(dòng)脈殘端破裂及吻合口假性動(dòng)脈瘤、人工血管再阻塞等。 CHAAR等[14]對44例外科手術(shù)后的病例進(jìn)行回顧性分析結(jié)果顯示,腋動(dòng)脈雙側(cè)股動(dòng)脈人工血管旁路移植術(shù)后人工血管阻塞率為29%。我國也有該術(shù)式的個(gè)案報(bào)道,賈鑫等[15]對3例行腹主動(dòng)脈結(jié)扎、腋動(dòng)脈雙側(cè)股動(dòng)脈人工血管旁路移植術(shù)后病人進(jìn)行了為期2年的隨訪,結(jié)果1例病人生存,1例圍手術(shù)期死于多器官衰竭,1例術(shù)后16個(gè)月死于破裂再出血。
1.2?腹主動(dòng)脈遠(yuǎn)端結(jié)扎、腹膜后解剖外旁路術(shù)
該術(shù)式為顯露腹主動(dòng)脈及瘤體遠(yuǎn)端髂外動(dòng)脈,在炎癥水腫較輕的一側(cè)腹膜做隧道,近端引向腹主動(dòng)脈,遠(yuǎn)端引向雙側(cè)髂外動(dòng)脈,橫斷腹主動(dòng)脈、結(jié)扎遠(yuǎn)端,行人工血管近端-主動(dòng)脈吻合以及人工血管遠(yuǎn)端-雙側(cè)髂外動(dòng)脈吻合。該術(shù)式的優(yōu)點(diǎn)與腹主動(dòng)脈結(jié)扎、腋動(dòng)脈雙側(cè)股動(dòng)脈人工血管旁路移植術(shù)類似,突出的是在一定程度上保留了解剖結(jié)構(gòu),人工血管通道短,明顯增加了人工血管遠(yuǎn)期通暢率。缺點(diǎn)是仍可發(fā)生吻合口漏、主動(dòng)脈殘端破裂及吻合口假性動(dòng)脈瘤等。肖占祥等[16]對4例IAAA病人行腹主動(dòng)脈遠(yuǎn)端結(jié)扎、腹膜后解剖外旁路術(shù)治療,作者采用周圍組織加固吻合口,切除感染瘤體后用過氧化氫、稀釋碘液進(jìn)行處理,填塞加固大網(wǎng)膜后放置引流,應(yīng)用抗生素4~6周,結(jié)果4例病人術(shù)后吻合口破裂率和人工血管感染率均為0。
IAAA病人的腹主動(dòng)脈因?yàn)榧?xì)菌感染,炎癥明顯,組織水腫、脆弱,手術(shù)操作困難,瘤頸不易控制,解剖外途徑血管重建修復(fù)最可怕的并發(fā)癥是主動(dòng)脈殘端爆裂,其發(fā)生率為1.8%~39.0%[17]。綜合國內(nèi)外文獻(xiàn),目前主要有兩種方法加固主動(dòng)脈殘端:就近選擇周圍組織加固主動(dòng)脈殘端,取筋膜-腹膜補(bǔ)片加固主動(dòng)脈殘端[1]。國外有學(xué)者嘗試在主動(dòng)脈結(jié)扎、腋動(dòng)脈雙側(cè)股動(dòng)脈人工血管旁路移植術(shù)中用筋膜-腹膜補(bǔ)片加固主動(dòng)脈殘端,取得良好效果。當(dāng)然,這兩種方法沒有大量的數(shù)據(jù)支持,國內(nèi)外僅有個(gè)案或小宗病例報(bào)道。
2?原位血管重建
解剖外途徑血管重建由于人工血管路徑長,血管容易扭曲,再阻塞成為令人困擾的難題,一些醫(yī)生主張行更符合血流動(dòng)力學(xué)的原位血管重建。理由是:此術(shù)式符合解剖和生理;吻合口大,血液壓力高,長期通暢率高;人工血管路徑短,不易扭曲。盡管許多文獻(xiàn)報(bào)道原位血管重建總體有效率高于腋動(dòng)脈-雙股轉(zhuǎn)流術(shù),但人工血管感染導(dǎo)致并發(fā)癥病死率高達(dá)18.9%~50.0%[18-21]。綜合國內(nèi)外文獻(xiàn)報(bào)道,原位血管重建主要有3種術(shù)式:人工血管原位重建、自體靜脈血管重建和同種異體血管代替原位重建。
2.1?人工血管原位重建
該術(shù)式為在擴(kuò)大清創(chuàng)的基礎(chǔ)上,切除主動(dòng)脈瘤體,用移植物(人工血管)重建近遠(yuǎn)端血運(yùn),恢復(fù)正常的解剖關(guān)系。此術(shù)式優(yōu)點(diǎn)是符合解剖和生理,吻合口大,血液壓力高,長期通暢率高,人工血管路徑短,不易扭曲。BOUZAS等[22]對1例大腸埃希菌感染的腹主動(dòng)脈瘤破裂病人急診進(jìn)行主動(dòng)脈瘤體切除+人工血管原位重建,術(shù)后用阿莫西林/克拉維酸抗微生物方案持續(xù)抗感染治療6周,成功挽救病人生命。但由于IAAA多數(shù)瘤壁不完整,若累及周圍組織,完全切除炎癥組織并非易事,手術(shù)操作過程中難免殘留病灶,行人工血管吻合感染概率高。艾小虎等[13]對2例IAAA病人進(jìn)行人工血管原位重建,結(jié)果1例術(shù)后發(fā)生感染,1例1年后仍然生存。國外學(xué)者也有小宗報(bào)道,總體感染導(dǎo)致并發(fā)癥病死率高達(dá)18.9%~23.0%[18-20]。因此,一些學(xué)者因?yàn)槠漭^高的感染復(fù)發(fā)致死率不推薦這種術(shù)式。
2.2?自身靜脈代替原位重建
因?yàn)槿斯ぱ芸垢腥灸芰Σ?,一旦感染,后果是致命的,為解決這一問題,有作者應(yīng)用抗感染材料,如采用敏感抗生素浸泡人工血管進(jìn)行重建[23-24],但有效性一直未得到證實(shí)。這時(shí),學(xué)者們就將自身材料作為首選。自體股靜脈能抗感染,為高壓主動(dòng)脈置換提供了良好的導(dǎo)管。對于血流動(dòng)力學(xué)穩(wěn)定的病人,無論是原發(fā)性還是繼發(fā)性主動(dòng)脈感染性疾病,將股靜脈作為血管導(dǎo)管可預(yù)防主動(dòng)脈感染,股靜脈移植可能是一個(gè)有吸引力和可行的選擇,成功率很高[25-28]。大隱靜脈也可被用于主動(dòng)脈重建[29]。
使用自身靜脈代替原位重建,首先需要確認(rèn)有無下肢深靜脈血栓形成,其次需要確認(rèn)股靜脈是否符合要求,一般來說,股靜脈直徑大于8 mm符合要求,然而,如果使用“Pantaloon”技術(shù),可以使用更小的股靜脈(最小6 mm)[27,30]。為了節(jié)約手術(shù)時(shí)間,手術(shù)可兩組人手同時(shí)進(jìn)行,一組顯露處理感染的腹主動(dòng)脈瘤,另一組取所需靜脈。在技術(shù)上,值得注意的是處理吻合技術(shù)的問題。目前有3種常規(guī)吻合技術(shù):①1條靜脈至主動(dòng)脈的近遠(yuǎn)端行端-端吻合;②將靜脈縫在一起,形成“褲腿”形,然后將其與主動(dòng)脈、雙側(cè)髂總動(dòng)脈吻合;③1條靜脈至主動(dòng)脈的近端行端-端吻合,靜脈遠(yuǎn)端與一側(cè)髂動(dòng)脈吻合,再髂-髂旁路移植。其中“褲腿”吻合技術(shù)直觀地提供了最好的血流動(dòng)力學(xué)輪廓,主動(dòng)脈爆裂的可能性也很小。多數(shù)學(xué)者主張?jiān)诿恳粋€(gè)手術(shù)過程中盡量使用“褲腿”吻合技術(shù),該吻合技術(shù)有發(fā)展成為常規(guī)的趨勢。盡管此術(shù)式需要時(shí)間將靜脈縫合到主動(dòng)脈上,但總體手術(shù)時(shí)間并不比常規(guī)手術(shù)長,并且通暢性好,閉塞性或動(dòng)脈瘤性并發(fā)癥發(fā)生率低,值得臨床應(yīng)用[25,31]。
2.3?同種異體血管代替原位重建
同種異體血管代替原位重建不但具有抗感染、為高壓主動(dòng)脈置換提供良好導(dǎo)管、血流動(dòng)力學(xué)穩(wěn)定等優(yōu)點(diǎn),而且還能避免取自身靜脈的再次創(chuàng)傷、減少手術(shù)時(shí)間,提供的動(dòng)脈血管管徑、長度與靶血管相匹配,目前已成為主動(dòng)脈感染性病變的一線選擇[32-36]。TICE等[34]將同種異體大隱靜脈應(yīng)用于25例病人下肢動(dòng)脈的重建,結(jié)果顯示2年通暢率為48%,開創(chuàng)了同種異體血管代替自身血管的先河。之后有學(xué)者將其應(yīng)用到主動(dòng)脈感染性病變,發(fā)現(xiàn)同種異體血管代替原位重建在圍手術(shù)期病死率、感染率、再手術(shù)率、5年生存率等方面較人工血管原位重建和自身靜脈代替原位重建均有一定優(yōu)勢[33,35]。HARLANDER等[35]對美國多中心接受同種異體血管代替原位重建的220例主動(dòng)脈感染病人進(jìn)行回顧性分析,結(jié)果顯示,移植物感染率為4%,圍手術(shù)期病死率為9%,術(shù)后5年生存率為51%。
但是同種異體血管的制備是一個(gè)復(fù)雜的過程,隨著國內(nèi)器官管理的規(guī)范化,同種異體血管的來源得到了支持,但仍有未解決的問題和難點(diǎn),如同種異體血管的保存技術(shù)、移植后的免疫排斥反應(yīng)等,這些問題使同種異體血管在我國的臨床應(yīng)用受到極大限制。
3?覆膜支架腔內(nèi)隔絕術(shù)
該術(shù)式為隔絕感染性動(dòng)脈瘤后在膿腔內(nèi)放入支架,原則上講該術(shù)式違背了外科感染的治療原則,因病人膿腔未清理,感染未控制,而感染相關(guān)并發(fā)癥是致命的。但因該術(shù)式具有微創(chuàng)、操作簡單、手術(shù)風(fēng)險(xiǎn)小、手術(shù)時(shí)間短等特點(diǎn),覆膜支架腔內(nèi)隔絕術(shù)在不耐受開放手術(shù)或急性出血的IAAA病人中逐漸得到應(yīng)用,且取得一定成果。最先報(bào)道覆膜支架腔內(nèi)隔絕術(shù)治療IAAA的學(xué)者是SEMBA等[37],他們報(bào)道了3例病人,手術(shù)均取得成功,術(shù)后隨訪也未見再發(fā)感染。賈鑫等[15]也報(bào)道了3例病人,手術(shù)均取得成功,術(shù)后隨訪無死亡及嚴(yán)重并發(fā)癥。PATEL等[38]報(bào)道的27例感染性動(dòng)脈瘤病人,均采用血管內(nèi)修復(fù),住院生存率88.5%,術(shù)后3年生存率57.8%。但也有文獻(xiàn)報(bào)道,覆膜支架腔內(nèi)隔絕術(shù)有較高的再感染并發(fā)癥病死率和二期開放手術(shù)率。KRITPRACHA等[39]報(bào)道了21例感染性動(dòng)脈瘤病人,均采用血管內(nèi)修復(fù)治療,其中5例并發(fā)消化道漏,病死率60%(3/5),余下的16例病死率為6%(1/16)。SEDIVY等[40]對31例IAAA病人實(shí)施腔內(nèi)治療,術(shù)后30 d病死率為19%,術(shù)后1年病死率為50%,術(shù)后3年病死率為19%。因此,覆膜支架腔內(nèi)隔絕術(shù)隔絕感染性動(dòng)脈瘤是否可行,仍需要進(jìn)一步探討。綜合國內(nèi)外文獻(xiàn),初步總結(jié)腔內(nèi)治療適應(yīng)證:①入院即發(fā)生感染性動(dòng)脈瘤破裂,可一期腔內(nèi)治療,二期開放手術(shù);②病人不能耐受開放手術(shù);③前期充分抗感染后感染得到控制。腔內(nèi)治療術(shù)前術(shù)后合理應(yīng)用抗生素抗感染是治療的關(guān)鍵[41-46],有一些學(xué)者應(yīng)用抗生素沖洗感染灶或浸泡人工支架[47-49],因這些報(bào)道都是個(gè)案,其效果有待進(jìn)一步觀察。
綜上所述,腹主動(dòng)脈結(jié)扎、腋動(dòng)脈雙側(cè)股動(dòng)脈人工血管旁路移植術(shù)能保證下肢血供,但手術(shù)創(chuàng)傷大、時(shí)間長,且存在人工血管感染及血栓形成的風(fēng)險(xiǎn)。自體靜脈重建腹主動(dòng)脈-雙側(cè)髂動(dòng)脈,取自體靜脈如股淺靜脈重建腹主動(dòng)脈,手術(shù)創(chuàng)傷大,將來可能出現(xiàn)下肢靜脈回流障礙;同種異體血管原位重建中同種異體血管的保存技術(shù)、移植后的免疫排斥反應(yīng)使同種異體血管在我國的臨床應(yīng)用受到極大限制。覆膜支架腔內(nèi)隔絕術(shù)隔絕假性動(dòng)脈瘤,因具有微創(chuàng)、操作簡單、手術(shù)風(fēng)險(xiǎn)小、手術(shù)時(shí)間短等特點(diǎn),在不耐受開放手術(shù)或急性出血的IAAA病人中逐漸得到應(yīng)用,但病人膿腔未清理、感染未控制,易發(fā)生感染相關(guān)并發(fā)癥。因此,IAAA的外科治療仍然存在爭議。手術(shù)方法的選擇主要取決于手術(shù)組的經(jīng)驗(yàn)和病人的臨床情況,目前仍然沒有一種創(chuàng)傷小、術(shù)后感染概率低的手術(shù)方案治療IAAA,需要進(jìn)一步的研究探討。
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