張?chǎng)危?袁 媛, 張曉彪, 楊志剛*
1.復(fù)旦大學(xué)附屬中山醫(yī)院神經(jīng)外科,上海 200032 2.同濟(jì)大學(xué)醫(yī)學(xué)院,上海 200092 3.上海澤顧護(hù)理院,上海 200082
神經(jīng)內(nèi)鏡在顱內(nèi)動(dòng)脈瘤外科治療中應(yīng)用的研究進(jìn)展
張?chǎng)?,2, 袁 媛3, 張曉彪1, 楊志剛1*
1.復(fù)旦大學(xué)附屬中山醫(yī)院神經(jīng)外科,上海 200032 2.同濟(jì)大學(xué)醫(yī)學(xué)院,上海 200092 3.上海澤顧護(hù)理院,上海 200082
神經(jīng)內(nèi)鏡在動(dòng)脈瘤夾閉術(shù)中對(duì)于觀察顱內(nèi)動(dòng)脈瘤與周圍血管、神經(jīng)的關(guān)系有獨(dú)特的優(yōu)勢(shì)。隨著技術(shù)進(jìn)展,利用內(nèi)鏡的光源和顯示系統(tǒng)輔助夾閉動(dòng)脈瘤,能使部分顱內(nèi)動(dòng)脈瘤手術(shù)夾閉效果明顯提高。盡管目前仍存在缺乏景深、鏡體本身占位、醫(yī)源性損傷等不足,但隨著內(nèi)鏡設(shè)備和手術(shù)方式的改良,神經(jīng)內(nèi)鏡將在動(dòng)脈瘤的外科治療中發(fā)揮良好的作用。
神經(jīng)內(nèi)鏡;顱內(nèi)動(dòng)脈瘤;外科夾閉
自發(fā)性蛛網(wǎng)膜下腔出血(subarachnoid hemorrhage,SAH)是一類致死率和致殘率較高的出血性卒中,而顱內(nèi)動(dòng)脈瘤是其主要病因。目前,顯微外科手術(shù)夾閉仍是治療顱內(nèi)動(dòng)脈瘤的主要方法之一[1]。神經(jīng)內(nèi)鏡是神經(jīng)外科中一項(xiàng)發(fā)展迅速的新技術(shù)。有研究[2]顯示,其使顱內(nèi)動(dòng)脈瘤手術(shù)夾閉的療效明顯提高。本文對(duì)神經(jīng)內(nèi)鏡在顱內(nèi)動(dòng)脈瘤顯微外科治療中的應(yīng)用綜述如下。
1977年,Apuzzo等[3]用帶有側(cè)角的內(nèi)窺鏡觀察Willis環(huán)上的動(dòng)脈瘤,并提出在顯微神經(jīng)外科手術(shù)中應(yīng)用內(nèi)鏡技術(shù)輔助的理念。1994年,F(xiàn)ischer和Mustafa[4]首先使用神經(jīng)內(nèi)鏡輔助顯微外科技術(shù)治療顱內(nèi)動(dòng)脈瘤,發(fā)現(xiàn)在動(dòng)脈瘤夾閉前后利用神經(jīng)內(nèi)鏡能充分觀察瘤體周圍解剖結(jié)構(gòu)和動(dòng)脈瘤夾閉效果,并發(fā)現(xiàn)一些在顯微鏡下認(rèn)為夾閉滿意的動(dòng)脈瘤在神經(jīng)內(nèi)鏡下顯示夾閉不全。因此,他們認(rèn)為在動(dòng)脈瘤夾閉術(shù)中使用內(nèi)鏡技術(shù)可充分探查分支血管走行情況,合理調(diào)整動(dòng)脈瘤夾的位置,提高手術(shù)效果。此后,神經(jīng)內(nèi)鏡越來越多地應(yīng)用于動(dòng)脈瘤手術(shù)[5-6]。Kalavakonda等[7]認(rèn)為,“內(nèi)鏡輔助顯微外科”是顱內(nèi)動(dòng)脈瘤外科治療的巨大進(jìn)步。在我國(guó),自趙繼宗等[8]2000年起開展神經(jīng)內(nèi)鏡輔助顯微外科手術(shù)治療顱內(nèi)動(dòng)脈瘤以來,經(jīng)過不斷改良和發(fā)展,該技術(shù)已成為顱內(nèi)動(dòng)脈瘤外科治療的主要技術(shù)之一。
完全夾閉動(dòng)脈瘤瘤頸,確保載瘤動(dòng)脈血流通暢,盡量避免病變周圍分支及穿支血管的誤夾閉,是手術(shù)夾閉顱內(nèi)動(dòng)脈瘤的原則[9]。在顯微外科手術(shù)中,顯微鏡的垂直視角常限制手術(shù)視野,動(dòng)脈瘤及周圍解剖結(jié)構(gòu)難以觀察完全,術(shù)后血管造影發(fā)現(xiàn)動(dòng)脈瘤瘤頸夾閉不全、分支血管誤夾閉、載瘤動(dòng)脈狹窄等情況時(shí)有發(fā)生。有文獻(xiàn)[10-13]報(bào)道,動(dòng)脈瘤夾閉手術(shù)后,發(fā)生瘤頸殘留的比例達(dá)19.0%,發(fā)生分支血管誤夾閉的比例為0.3%~12.0%。術(shù)中對(duì)于載瘤動(dòng)脈及周圍穿支血管的充分觀察、合理調(diào)整動(dòng)脈瘤夾,是提高手術(shù)成功率的重要方法[14]。然而,顯微外科手術(shù)中更多的顯露會(huì)增加操作及損傷。
隨著神經(jīng)內(nèi)鏡設(shè)備的改良和鏡下手術(shù)操作技術(shù)的優(yōu)化,其在顯微外科手術(shù)中的應(yīng)用范圍不斷擴(kuò)大[15]。神經(jīng)內(nèi)鏡在動(dòng)脈瘤外科中的應(yīng)用主要包括內(nèi)鏡輔助顯微神經(jīng)外科(endoscope-assisted microneurosurgery,EAM)與內(nèi)鏡控制顯微神經(jīng)外科(endoscope-controlled microneurosurgery,ECM)[16]。術(shù)中在動(dòng)脈瘤夾閉前使用神經(jīng)內(nèi)鏡輔助觀察,充分顯示瘤體、瘤頸形態(tài)和病變周圍分支、穿支血管走行情況;夾閉后再次置入內(nèi)鏡,觀察瘤頸夾閉情況,是否存在載瘤動(dòng)脈狹窄或穿支血管誤夾,根據(jù)觀察結(jié)果合理調(diào)整動(dòng)脈瘤夾,至動(dòng)脈瘤夾閉滿意,屬于EAM治療方法。在顯微神經(jīng)外科常規(guī)操作基礎(chǔ)上,手術(shù)全程應(yīng)用神經(jīng)內(nèi)鏡光源,在內(nèi)鏡顯示系統(tǒng)監(jiān)測(cè)下進(jìn)行動(dòng)脈瘤夾閉,則屬于ECM。ECM中神經(jīng)內(nèi)鏡的作用更大,避免了頻繁進(jìn)行內(nèi)鏡-顯微鏡的切換[8],但目前應(yīng)用較少。
在動(dòng)脈瘤夾閉手術(shù)中,神經(jīng)內(nèi)鏡輔助有助于更全面了解動(dòng)脈瘤周圍解剖結(jié)構(gòu),在動(dòng)脈瘤暴露、分離過程中可減少對(duì)載瘤動(dòng)脈、腦組織等結(jié)構(gòu)的牽拉;也便于選擇合適型號(hào)的動(dòng)脈瘤夾,縮短臨時(shí)阻斷載瘤動(dòng)脈的時(shí)間[17],降低術(shù)中動(dòng)脈瘤破裂風(fēng)險(xiǎn),減少術(shù)后腦血管痙攣、腦挫傷等并發(fā)癥。因此,其尤其適用于位置深或瘤體形態(tài)復(fù)雜的動(dòng)脈瘤手術(shù)[18],以及腦血管發(fā)育不良、側(cè)支循環(huán)代償不佳的患者。
神經(jīng)內(nèi)鏡使用時(shí)需要必要的操作空間和清晰的手術(shù)視野[19]。因此我們認(rèn)為,未破裂或血腫吸收良好的顱內(nèi)動(dòng)脈瘤、Hunt-Hess分級(jí)低(Ⅰ~Ⅱ級(jí))的顱內(nèi)動(dòng)脈瘤更適合神經(jīng)內(nèi)鏡輔助手術(shù)夾閉;而對(duì)于Hunt-Hess分級(jí)Ⅲ~Ⅴ級(jí)的顱內(nèi)動(dòng)脈瘤患者、破裂出血急性期且術(shù)中釋放腦脊液不能有效降低顱內(nèi)壓的動(dòng)脈瘤患者,該技術(shù)不適用。
3.1 在特殊形態(tài)動(dòng)脈瘤治療中的應(yīng)用 顱內(nèi)巨大動(dòng)脈瘤由于瘤頸寬大、占位效應(yīng)明顯、瘤內(nèi)血栓形成、載瘤動(dòng)脈增粗、硬化扭曲等因素,導(dǎo)致治療非常困難。而常用的血管內(nèi)介入治療有血栓脫落、栓塞不完全、栓塞導(dǎo)致占位效應(yīng)、易復(fù)發(fā)、費(fèi)用高以及介入材料受限等缺陷。神經(jīng)內(nèi)鏡可幫助術(shù)者觀察巨大動(dòng)脈瘤的瘤頸情況,例如對(duì)于頸內(nèi)動(dòng)脈床突段巨大動(dòng)脈瘤,瘤頸多位于前床突下方,傳統(tǒng)手術(shù)往往需要磨除前床突,風(fēng)險(xiǎn)較大[20]。若使用30°神經(jīng)內(nèi)鏡輔助,可顯露動(dòng)脈瘤頸形態(tài)及其與海綿竇、頸內(nèi)動(dòng)脈的關(guān)系,動(dòng)脈瘤與前床突間有無粘連,避免盲目磨除前床突時(shí)導(dǎo)致動(dòng)脈瘤破裂。
對(duì)于顱內(nèi)形態(tài)復(fù)雜的動(dòng)脈瘤(如有子囊的動(dòng)脈瘤或分葉狀動(dòng)脈瘤),夾閉術(shù)中因瘤體遮擋,瘤頸和載瘤動(dòng)脈常常無法在顯微鏡下直視觀察,給動(dòng)脈瘤夾的選擇和放置造成困難。動(dòng)脈瘤的復(fù)雜形態(tài)也會(huì)影響夾閉之后使用吲哚菁綠(indocyanine green,ICG)造影觀察夾閉效果和判斷是否誤夾載瘤動(dòng)脈[21]。Mielke等[22]通過對(duì)比結(jié)合內(nèi)鏡和單獨(dú)顯微鏡下ICG造影的效果,認(rèn)為神經(jīng)內(nèi)鏡結(jié)合ICG熒光造影觀察瘤頸和載瘤動(dòng)脈具有明顯優(yōu)勢(shì),有利于手術(shù)效果和患者預(yù)后的評(píng)估。
3.2 在特殊部位動(dòng)脈瘤治療中的應(yīng)用 單用顯微鏡分離動(dòng)脈瘤瘤頸時(shí),對(duì)一些深部結(jié)構(gòu),尤其是隱藏在頸內(nèi)動(dòng)脈或動(dòng)脈瘤底面的結(jié)構(gòu)無法看清,容易造成穿支血管的損傷[14]。神經(jīng)內(nèi)鏡可輔助術(shù)者對(duì)這些部位的動(dòng)脈瘤瘤頸進(jìn)行充分觀察和分離。特殊部位顱內(nèi)動(dòng)脈瘤顯微外科夾閉手術(shù)中,神經(jīng)內(nèi)鏡同樣有助于在夾閉動(dòng)脈瘤之前明確動(dòng)脈瘤頸的準(zhǔn)確位置、穿支血管走行路徑,對(duì)于選取合適的動(dòng)脈瘤夾提供幫助,還可以在放置動(dòng)脈瘤夾后及時(shí)發(fā)現(xiàn)夾閉不全和誤夾,提高手術(shù)療效。
對(duì)于脈絡(luò)膜前動(dòng)脈動(dòng)脈瘤,當(dāng)瘤體較大、合并粘連或瘤頂指向天幕緣下外側(cè)時(shí),載瘤動(dòng)脈可能因瘤體本身或動(dòng)脈瘤夾的阻擋而顯露不理想。為了顯露結(jié)構(gòu)而過度牽拉周圍組織時(shí),可能導(dǎo)致動(dòng)脈瘤破裂[18]。若使用內(nèi)鏡輔助技術(shù),可清晰顯露載瘤動(dòng)脈和動(dòng)脈瘤夾閉效果,提高手術(shù)安全性和療效。對(duì)于基底動(dòng)脈主干及頂端動(dòng)脈瘤,基底動(dòng)脈向后走行的穿通支在顯微鏡下無法看到,用內(nèi)鏡觀察則可防止穿支血管誤夾或瘤頸殘留[23-24]。典型的后交通動(dòng)脈瘤通常指向外側(cè),如果術(shù)中將頸內(nèi)動(dòng)脈向內(nèi)側(cè)牽拉,動(dòng)脈瘤頂端受到牽拉可能導(dǎo)致破裂[25]。使用神經(jīng)內(nèi)鏡輔助,能夠詳細(xì)觀察動(dòng)脈瘤周圍的信息,避免不必要的牽拉所致的動(dòng)脈瘤破裂。
微創(chuàng)鎖孔手術(shù)原則是通過最直接準(zhǔn)確的入路到達(dá)病灶,避免對(duì)正常結(jié)構(gòu)的過多暴露和牽拉,從而最大限度降低手術(shù)損傷,適用于顱內(nèi)動(dòng)脈瘤的外科治療。但小骨窗的鎖孔手術(shù)不利于光源投射,導(dǎo)致顯微鏡術(shù)野的照明和觀察受限。而神經(jīng)內(nèi)鏡具有廣角成像的特點(diǎn),可形成“魚眼”效應(yīng),能彌補(bǔ)鎖孔手術(shù)的不足[26]。Ho等[27]認(rèn)為,眶上鎖孔入路結(jié)合神經(jīng)內(nèi)鏡輔助夾閉破裂的幕上動(dòng)脈瘤安全有效。使用鎖孔手術(shù)治療周圍解剖結(jié)構(gòu)復(fù)雜、術(shù)野觀察可能受限的顱內(nèi)動(dòng)脈瘤時(shí),結(jié)合神經(jīng)內(nèi)鏡輔助技術(shù)可有效擴(kuò)大術(shù)中觀察范圍,有助于動(dòng)脈瘤及周圍解剖結(jié)構(gòu)的顯露,避免術(shù)中重要結(jié)構(gòu)損傷,提高夾閉成功率。近年亦有研究[28-29]嘗試神經(jīng)內(nèi)鏡輔助結(jié)合改良經(jīng)鼻入路及血管內(nèi)治療方式,進(jìn)行前、后循環(huán)動(dòng)脈瘤的外科手術(shù)夾閉,手術(shù)效果良好。
作為還在成長(zhǎng)中的新興技術(shù),目前神經(jīng)內(nèi)鏡在動(dòng)脈瘤外科治療中還處于探索階段,也有自身的局限。有學(xué)者[7,18]認(rèn)為,神經(jīng)內(nèi)鏡并不能為動(dòng)脈瘤手術(shù)提供更多信息,使用內(nèi)鏡輔助還可能導(dǎo)致動(dòng)脈瘤破裂、誤傷其毗鄰結(jié)構(gòu)或發(fā)生更多術(shù)后并發(fā)癥;神經(jīng)內(nèi)鏡技術(shù)學(xué)習(xí)曲線較長(zhǎng),術(shù)者需要有一定的內(nèi)鏡操作經(jīng)驗(yàn)并在熟悉解剖的情況下,才可將神經(jīng)內(nèi)鏡應(yīng)用于輔助動(dòng)脈瘤夾閉術(shù)中;應(yīng)在術(shù)前充分評(píng)估使用內(nèi)鏡的利弊,并對(duì)可能出現(xiàn)的意外做好充分的應(yīng)對(duì)準(zhǔn)備。
此外,內(nèi)鏡獲得的信息為二維圖像,缺乏景深感。若希望通過內(nèi)鏡獲得更直觀的手術(shù)視野,需將內(nèi)鏡置入到合適的解剖部位。由于動(dòng)脈瘤位置深在,手術(shù)空間狹小,鄰近腦組織、周圍其他血管、動(dòng)脈瘤體本身均可能影響內(nèi)鏡置入。在使用帶有側(cè)角的神經(jīng)內(nèi)鏡時(shí),僅顯示側(cè)方圖像,對(duì)于鏡頭前方和后方的結(jié)構(gòu)無法同時(shí)顯示,經(jīng)驗(yàn)不足同樣增加損傷機(jī)會(huì)[25]。
目前對(duì)于神經(jīng)內(nèi)鏡輔助顯微外科治療顱內(nèi)動(dòng)脈瘤的報(bào)道相對(duì)較少,這一技術(shù)仍限于部分有經(jīng)驗(yàn)的術(shù)者在合適的病例中使用。然而,盡管這一技術(shù)存在內(nèi)鏡下手術(shù)視野變化、軟質(zhì)內(nèi)鏡分辨率不足、神經(jīng)內(nèi)鏡手術(shù)學(xué)習(xí)曲線較長(zhǎng)等局限,但神經(jīng)內(nèi)鏡局部良好照明、繞角觀察等優(yōu)勢(shì)是目前其他神經(jīng)外科技術(shù)沒有的。隨著操作者經(jīng)驗(yàn)的積累、內(nèi)鏡三維視野的發(fā)展、內(nèi)鏡下動(dòng)脈瘤夾閉器械的改進(jìn)、內(nèi)鏡下熒光素造影[22]以及仿真內(nèi)鏡的推廣[30],神經(jīng)內(nèi)鏡在動(dòng)脈瘤外科治療中將發(fā)揮更大的作用。
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Application of the neuroendoscope in the surgical treatment of intracranial aneurysms: research progress
ZHANG Xin1,2, YUAN yuan3, ZHANG Xiao-biao1, YANG Zhi-gang1*
1.Department of Neurosurgery, Zhongshan Hospital, Fudan University, Shanghai 200032, China 2.Tongji University School of Medical, Shanghai 200092, China 3.Shanghai Zegu Nursing Home, Shanghai 200082, China
Neuroendoscope has unique advantages in observing the relationship between intracranial aneurysms and peripheral vessels and nerves during intracranial aneurysm clipping. With the development of neuroendoscope technology, as well as the assistance of endoscopic light and display system, the clipping effects of some intracranial aneurysms have significantly improved. Although there are still the lack of depth of the operation field, the space occupying of the endoscope itself and iatrogenic injury, with the development of endoscopic equipment and operation methods, neuroendoscope will play its role in the surgical treatment of intracranial aneurysms.
neuroendoscope; intracranial aneurysm; surgical clipping
2017-06-06接受日期2017-09-22
上海市科委醫(yī)學(xué)引導(dǎo)類項(xiàng)目(14411967600).Supported by Medical Guidance Project of Shanghai Municipal Science and Technology Commission(14411967600).
張 鑫, 同濟(jì)大學(xué)醫(yī)學(xué)院本科生.E-mail:zhang_xin9313@163.com
*通信作者(Corresponding author). Tel: 021-64041990, E-mail:yang.zhigang1@zs-hospital.sh.cn
10.12025/j.issn.1008-6358.2017.20170484
R 739.41
A
[本文編輯] 姬靜芳