[摘要]"腦損傷引起的意識(shí)障礙是影響患者生活質(zhì)量的嚴(yán)重神經(jīng)功能缺陷,其發(fā)生機(jī)制復(fù)雜多樣。作為一種無(wú)創(chuàng)神經(jīng)調(diào)控技術(shù),經(jīng)顱磁刺激在意識(shí)障礙評(píng)估和治療中表現(xiàn)出巨大潛力。本文綜述經(jīng)顱磁刺激在腦損傷后意識(shí)障礙中的應(yīng)用,并展望經(jīng)顱磁刺激在未來(lái)臨床研究中的應(yīng)用前景。
[關(guān)鍵詞]"經(jīng)顱磁刺激;意識(shí)障礙;神經(jīng)可塑性;促醒治療
[中圖分類號(hào)]"R493""""""[文獻(xiàn)標(biāo)識(shí)碼]"A""""""[DOI]"10.3969/j.issn.1673-9701.2025.05.030
腦損傷的成因多種多樣,包括顱腦外傷、腦卒中、缺氧性損傷、感染和代謝性疾病等,這些因素嚴(yán)重影響腦部結(jié)構(gòu)和功能。盡管急救措施可顯著提高腦損傷患者的存活率,但一些重癥患者仍可能出現(xiàn)持續(xù)的意識(shí)障礙[1]。傳統(tǒng)治療方法在應(yīng)對(duì)意識(shí)障礙方面存在一定的局限性。經(jīng)顱磁刺激(transcranial"magnetic"stimulation,TMS)、經(jīng)顱直流電刺激和經(jīng)顱超聲刺激等非侵入性腦刺激技術(shù)逐漸成為應(yīng)對(duì)意識(shí)障礙的前沿工具[2]。
TMS由Barker等[3]于1985年提出,利用磁場(chǎng)在腦部特定區(qū)域產(chǎn)生電流調(diào)節(jié)神經(jīng)活動(dòng)。最初,TMS主要用于治療抑郁癥和其他精神疾病。近年來(lái)研究表明TMS不僅可提供腦功能信息,還能促進(jìn)腦功能恢復(fù),改善患者意識(shí)水平,在意識(shí)障礙治療領(lǐng)域展現(xiàn)出獨(dú)特潛力[4-5]。有研究探索TMS在腦損傷引發(fā)的意識(shí)障礙評(píng)估與治療中的作用[6-7]。然而,該領(lǐng)域仍面臨諸多挑戰(zhàn),如個(gè)體化刺激參數(shù)的確定、長(zhǎng)期效果評(píng)估及技術(shù)標(biāo)準(zhǔn)化等問(wèn)題[8]。本文深入探討TMS在腦損傷后意識(shí)障礙領(lǐng)域的最新應(yīng)用進(jìn)展,包括其作用機(jī)制、臨床應(yīng)用和未來(lái)發(fā)展方向,為相關(guān)研究提供有價(jià)值的理論參考。
1""意識(shí)障礙的發(fā)生機(jī)制
意識(shí)的發(fā)生機(jī)制極為復(fù)雜,涉及網(wǎng)狀激活系統(tǒng)、丘腦-皮質(zhì)連接、皮質(zhì)-皮質(zhì)連接、大腦皮層功能的完整性及神經(jīng)遞質(zhì)系統(tǒng)等[9-10]。盡管腦組織結(jié)構(gòu)損傷是導(dǎo)致意識(shí)障礙的直接原因,但意識(shí)障礙的核心根源在于腦損傷引發(fā)的腦功能網(wǎng)絡(luò)連接異常。Schiff等[11]提出“中央環(huán)路假說(shuō)”,認(rèn)為信息通過(guò)上行網(wǎng)狀激活系統(tǒng)傳遞,經(jīng)過(guò)丘腦到達(dá)大腦皮層,并在額-頂回路中整合處理,從而形成意識(shí)。隨著功能性磁共振成像和擴(kuò)散張量成像等技術(shù)的進(jìn)步,人們對(duì)腦網(wǎng)絡(luò)的理解不斷加深。額頂葉網(wǎng)絡(luò)與意識(shí)密切相關(guān),尤其是中央執(zhí)行網(wǎng)絡(luò)和默認(rèn)模式網(wǎng)絡(luò)。Raichle等[12]研究表明,當(dāng)大腦處于靜息狀態(tài)時(shí),內(nèi)側(cè)前額葉皮質(zhì)、楔前葉和角回等區(qū)域保持高度活躍,這些區(qū)域被認(rèn)為與自我意識(shí)和認(rèn)知過(guò)程密切相關(guān)。中央執(zhí)行網(wǎng)絡(luò)主要涉及前額葉皮質(zhì)和后頂葉區(qū)域,負(fù)責(zé)執(zhí)行功能、決策和注意力控制,與外部意識(shí)密切相關(guān)。另有研究表明,默認(rèn)模式網(wǎng)絡(luò)與中央執(zhí)行網(wǎng)絡(luò)之間是對(duì)立關(guān)系;當(dāng)一個(gè)網(wǎng)絡(luò)被激活時(shí),另一個(gè)網(wǎng)絡(luò)通常處于抑制狀態(tài),這種動(dòng)態(tài)平衡對(duì)意識(shí)活動(dòng)至關(guān)重要[13]。除結(jié)構(gòu)性損傷導(dǎo)致的腦網(wǎng)絡(luò)功能損害外,意識(shí)障礙還涉及其他復(fù)雜的病理機(jī)制。如神經(jīng)遞質(zhì)失衡可干擾神經(jīng)元間的信息傳遞;代謝異??捎绊懩X細(xì)胞的能量供應(yīng);而血流動(dòng)力學(xué)變化可導(dǎo)致局部腦血流量不足,加重意識(shí)障礙。因此,理解意識(shí)障礙的發(fā)生機(jī)制需要綜合考慮腦網(wǎng)絡(luò)的結(jié)構(gòu)性和動(dòng)態(tài)變化、神經(jīng)遞質(zhì)系統(tǒng)狀態(tài)、代謝水平及血流動(dòng)力學(xué)變化。
2""TMS在意識(shí)障礙臨床評(píng)估中的應(yīng)用
2.1""單脈沖TMS與成對(duì)脈沖TMS的應(yīng)用
單脈沖TMS是一種每次僅輸出一個(gè)脈沖的刺激模式,常用于研究大腦皮質(zhì)功能及神經(jīng)傳導(dǎo)路徑。通過(guò)刺激特定皮質(zhì)區(qū)域,單脈沖TMS可提供大腦在特定任務(wù)或刺激下的反應(yīng)數(shù)據(jù),為揭示大腦基本功能提供重要信息[14]。相比之下,成對(duì)脈沖TMS通過(guò)設(shè)定兩個(gè)脈沖之間的時(shí)間間隔探測(cè)大腦的抑制性和興奮性反應(yīng)。短間隔成對(duì)脈沖(如3~5ms)主要用于研究皮質(zhì)內(nèi)的抑制機(jī)制,而較長(zhǎng)間隔成對(duì)脈沖(如50~200ms)則用于研究皮層的興奮性。成對(duì)脈沖TMS已成為研究意識(shí)障礙患者神經(jīng)功能的有力工具[15-16]。此外,TMS激發(fā)的運(yùn)動(dòng)誘發(fā)電位可有效評(píng)估患者運(yùn)動(dòng)皮質(zhì)的興奮性及皮質(zhì)脊髓通路的完整性。運(yùn)動(dòng)誘發(fā)電位的幅度和潛伏期變化為研究者提供關(guān)于運(yùn)動(dòng)皮質(zhì)活動(dòng)狀態(tài)及其與脊髓神經(jīng)元通信效率的關(guān)鍵信息。如,運(yùn)動(dòng)誘發(fā)電位幅度的減小或潛伏期的延長(zhǎng)可反映皮質(zhì)脊髓通路的功能障礙,這些指標(biāo)在意識(shí)障礙研究和臨床診斷中具有重要應(yīng)用價(jià)值[17-18]。
2.2""TMS聯(lián)合腦電圖
TMS聯(lián)合腦電圖是一種結(jié)合TMS和腦電圖信號(hào)的技術(shù),通過(guò)TMS激活大腦特定區(qū)域并同步記錄腦電圖信號(hào),捕捉由此引發(fā)的腦電活動(dòng)。該技術(shù)的優(yōu)勢(shì)在于其非侵入性和高時(shí)間分辨率,且無(wú)需患者主動(dòng)配合,可廣泛應(yīng)用于大腦皮質(zhì)興奮性、連接性和功能狀態(tài)的研究[19]。Casali等[20]提出并驗(yàn)證將基于TMS聯(lián)合腦電圖的擾動(dòng)復(fù)雜性指數(shù)作為新的意識(shí)評(píng)估工具,該指標(biāo)能量化并區(qū)分清醒、睡眠和麻醉等不同狀態(tài)下的意識(shí)水平。另有研究表明,擾動(dòng)復(fù)雜性指數(shù)可有效區(qū)分無(wú)反應(yīng)覺(jué)醒綜合征和微意識(shí)狀態(tài)患者,在檢測(cè)微意識(shí)狀態(tài)患者時(shí),擾動(dòng)復(fù)雜性指數(shù)的敏感度高達(dá)92%[21]。綜上,單脈沖TMS與成對(duì)脈沖TMS及其與腦電圖相結(jié)合的技術(shù)可極大推動(dòng)腦功能和意識(shí)狀態(tài)的研究。
3""TMS在意識(shí)障礙臨床治療中的應(yīng)用
3.1""不同刺激靶點(diǎn)TMS在意識(shí)障礙中的應(yīng)用
TMS在意識(shí)障礙治療中展現(xiàn)出廣闊的應(yīng)用前景。不同腦區(qū)在意識(shí)的產(chǎn)生、維持和恢復(fù)中發(fā)揮各自獨(dú)特的作用。因此,精確選擇TMS的刺激部位對(duì)意識(shí)障礙的康復(fù)至關(guān)重要。目前,臨床研究主要集中于前額葉皮質(zhì)、初級(jí)運(yùn)動(dòng)皮質(zhì)及頂枕葉等關(guān)鍵區(qū)域。前額葉,特別是背外側(cè)前額葉皮質(zhì),因其在高級(jí)認(rèn)知功能、情緒調(diào)節(jié)和社會(huì)行為中的重要性,已被廣泛用于意識(shí)障礙的干預(yù)治療。重復(fù)經(jīng)顱磁刺激(repetitive"transcranial"magnetic"stimulation,rTMS)作用于背外側(cè)前額葉皮質(zhì)是最有效的治療方式之一。該區(qū)域涉及工作記憶、決策和情緒調(diào)節(jié)等腦關(guān)鍵功能。因此,通過(guò)刺激背外側(cè)前額葉皮質(zhì)有望改善這些功能,促進(jìn)患者的意識(shí)恢復(fù)[22]。盡管初級(jí)運(yùn)動(dòng)皮質(zhì)區(qū)主要與運(yùn)動(dòng)功能相關(guān),但近年來(lái)研究發(fā)現(xiàn),應(yīng)用rTMS于初級(jí)運(yùn)動(dòng)皮質(zhì)區(qū)在緩解疼痛、抑郁和焦慮等精神障礙方面取得顯著效果,因此其對(duì)意識(shí)障礙的干預(yù)作用同樣不可忽視[23]。此外作為意識(shí)處理的重要區(qū)域,后頂葉皮質(zhì),特別是楔前葉在情境記憶、自我處理、運(yùn)動(dòng)想象及信息整合中發(fā)揮關(guān)鍵作用。楔前葉不僅在植物狀態(tài)與最小意識(shí)狀態(tài)的區(qū)分中起重要作用,還對(duì)意識(shí)水平的恢復(fù)產(chǎn)生關(guān)鍵影響[24]。綜上,盡管各腦區(qū)域在意識(shí)的產(chǎn)生和恢復(fù)中扮演不同角色,深入研究TMS在不同腦區(qū)的作用及其相互作用仍是優(yōu)化意識(shí)障礙治療的關(guān)鍵。
3.2""不同頻率rTMS在意識(shí)障礙中的臨床效果
rTMS通過(guò)特定頻率的重復(fù)磁脈沖刺激并調(diào)節(jié)神經(jīng)元的活動(dòng)。針對(duì)意識(shí)障礙的促醒效果,rTMS的臨床療效受多種因素的影響,包括刺激部位、頻率、強(qiáng)度和時(shí)程等。根據(jù)頻率的不同,可分為高頻rTMS(gt;1Hz)和低頻rTMS(≤1Hz),前者對(duì)大腦特定區(qū)域產(chǎn)生興奮效應(yīng),而后者則產(chǎn)生抑制作用[25]。研究發(fā)現(xiàn)10Hz的rTMS可顯著增強(qiáng)雙側(cè)N20成分意識(shí)障礙患者的神經(jīng)連接性[26];而20Hz的rTMS在提高意識(shí)障礙患者的覺(jué)醒度和意識(shí)水平方面效果良好[5]。然而,低頻rTMS在意識(shí)障礙中的應(yīng)用研究相對(duì)較少。研究指出0.5Hz的rTMS可能對(duì)植物狀態(tài)患者具有促醒作用,但這些研究樣本量較小,且證據(jù)仍較為薄弱,因此需進(jìn)一步驗(yàn)證其臨床效果[27-28]。Huang等[29]提出的Theta暴發(fā)式刺激(Theta"burst"stimulation,TBS)模式模擬海馬神經(jīng)的生理放電頻率,與傳統(tǒng)rTMS相比,TBS具有時(shí)程較短、誘發(fā)不良反應(yīng)較少的優(yōu)勢(shì)。Wu等[30]對(duì)8例微意識(shí)狀態(tài)、植物狀態(tài)患者進(jìn)行間歇性TBS治療,結(jié)果顯示治療后患者在行為學(xué)評(píng)估和腦電圖數(shù)據(jù)上均表現(xiàn)出持久的改善,提示TBS在意識(shí)障礙治療中的潛力。加以TBS的具體療效及作用機(jī)制仍需更多研究和驗(yàn)證。
3.3""聯(lián)合神經(jīng)調(diào)控技術(shù)在意識(shí)障礙中的應(yīng)用
隨著神經(jīng)調(diào)控技術(shù)的發(fā)展,越來(lái)越多的研究開(kāi)始探討rTMS與其他技術(shù)的聯(lián)合使用,以期通過(guò)多途徑干預(yù)并提升意識(shí)障礙治療效果。Xiong等[31]研究發(fā)現(xiàn)正中神經(jīng)刺激(median"nerve"stimulation,MNS)聯(lián)合rTMS可顯著改善意識(shí)障礙患者的意識(shí)水平和神經(jīng)功能;與單獨(dú)使用MNS或rTMS相比,聯(lián)合治療的效果更顯著,提示MNS與rTMS的協(xié)同效應(yīng)可增強(qiáng)治療效果。Hosseinian等[32]探索經(jīng)顱交流電刺激與rTMS的聯(lián)合應(yīng)用,結(jié)果發(fā)現(xiàn)同步rTMS的脈沖與經(jīng)顱交流電刺激的相位可有效誘導(dǎo)并維持特定頻率的腦振蕩,從而穩(wěn)定大腦皮質(zhì)的神經(jīng)活動(dòng)。這為意識(shí)障礙及其他神經(jīng)精神疾病的治療指明新的研究方向。陳喆思等[33]研究表明,3個(gè)月的rTMS聯(lián)合電針治療可顯著提高患者的格拉斯哥昏迷指數(shù)評(píng)分和持續(xù)性植物狀態(tài)評(píng)分,提示電針可增強(qiáng)rTMS的促醒作用。總體來(lái)看,聯(lián)合神經(jīng)調(diào)控技術(shù)在提高意識(shí)障礙治療效果方面潛力巨大。未來(lái)的研究應(yīng)進(jìn)一步優(yōu)化聯(lián)合治療方案,并通過(guò)大規(guī)模臨床試驗(yàn)驗(yàn)證其療效和機(jī)制。
4""TMS改善意識(shí)障礙的機(jī)制
TMS改善意識(shí)障礙的機(jī)制主要涉及調(diào)節(jié)神經(jīng)元的活動(dòng)、促進(jìn)突觸可塑性、改變腦血流和代謝及重塑神經(jīng)網(wǎng)絡(luò)。首先,TMS通過(guò)快速變化的磁場(chǎng)在大腦局部誘發(fā)感應(yīng)電流,進(jìn)而改變神經(jīng)元的膜電位。高頻rTMS通過(guò)持續(xù)刺激神經(jīng)元,增強(qiáng)其興奮性,廣泛應(yīng)用于改善大腦功能;相反,低頻rTMS則通過(guò)超極化作用,減少神經(jīng)活動(dòng)的頻率,常用于抑制皮層過(guò)度活躍的區(qū)域[34]。其次,TMS可調(diào)節(jié)突觸連接的強(qiáng)度。腦源性神經(jīng)營(yíng)養(yǎng)因子(brain-derived"neurotrophic"factor,BDNF)在突觸可塑性中起重要作用。研究表明,高頻rTMS可促進(jìn)BDNF的表達(dá),增強(qiáng)突觸的強(qiáng)度[35]。同時(shí)TMS還調(diào)節(jié)興奮性神經(jīng)遞質(zhì)谷氨酸與抑制性神經(jīng)遞質(zhì)γ-氨基丁酸(γ-"aminobutyric"acid,GABA)間的平衡。高頻rTMS通常促進(jìn)谷氨酸的釋放,增強(qiáng)突觸可塑性;而低頻rTMS則通過(guò)增強(qiáng)GABA的活性抑制突觸的可塑性[36]。此外,TMS還可引發(fā)局部腦區(qū)的血流變化,特別是在被刺激區(qū)域。研究表明20Hz高頻rTMS可顯著增加左內(nèi)側(cè)顳葉或海馬體的腦血流量,而假刺激組未見(jiàn)此變化,提示高頻rTMS可通過(guò)腦血流的再分布發(fā)揮作用[37]。最后,TMS不僅可直接作用于特定腦區(qū),還可通過(guò)網(wǎng)絡(luò)連接擴(kuò)展至其他區(qū)域,重塑神經(jīng)網(wǎng)絡(luò),修復(fù)受損的神經(jīng)環(huán)路,從而有助于恢復(fù)意識(shí)功能[38]。
5""小結(jié)與展望
TMS作為一種非侵入性神經(jīng)調(diào)控技術(shù),在治療意識(shí)障礙方面的應(yīng)用前景廣闊。然而,TMS的臨床應(yīng)用仍面臨一系列挑戰(zhàn),包括個(gè)體差異、治療參數(shù)設(shè)定、長(zhǎng)期效果評(píng)估等問(wèn)題。因此,需在多方面進(jìn)一步優(yōu)化與拓展。首先,個(gè)性化治療方案的研發(fā)至關(guān)重要。由于患者在病理生理特征和病情進(jìn)展上存在差異,為提高治療效果,須根據(jù)個(gè)體差異制定個(gè)體化的TMS治療方案。其次,優(yōu)化治療參數(shù)是提升TMS療效的關(guān)鍵。刺激部位、頻率和強(qiáng)度等治療參數(shù)對(duì)意識(shí)障礙的治療效果有顯著影響。此外,意識(shí)障礙的長(zhǎng)期效果評(píng)估仍面臨缺乏標(biāo)準(zhǔn)化工具的挑戰(zhàn)。盡管TMS聯(lián)合腦電圖技術(shù)在提高診斷精度方面具有巨大潛力,但仍需建立統(tǒng)一的評(píng)估系統(tǒng),并結(jié)合多維度數(shù)據(jù)分析方法應(yīng)對(duì)這一難題。目前,針對(duì)意識(shí)障礙的TMS研究樣本量較小,未來(lái)應(yīng)設(shè)計(jì)多中心、大規(guī)模的臨床試驗(yàn),以驗(yàn)證TMS的治療效果與安全性,從而進(jìn)一步優(yōu)化個(gè)體化治療方案及治療參數(shù)。探索TMS與藥物治療、康復(fù)訓(xùn)練等其他治療手段的聯(lián)合應(yīng)用將有助于優(yōu)化治療方案。聯(lián)合應(yīng)用經(jīng)顱直流電刺激或功能性磁共振成像引導(dǎo)的精準(zhǔn)定位等技術(shù)可能成為提高治療效果的重要途徑[39]。綜上,TMS在意識(shí)障礙的治療和評(píng)估中展現(xiàn)出巨大潛力,未來(lái)有望在臨床應(yīng)用中發(fā)揮更大作用。
利益沖突:所有作者均聲明不存在利益沖突。
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