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      緊張型頭痛機(jī)制研究進(jìn)展

      2019-03-18 01:48:18孫永欣姚剛于挺敏滿玉紅
      關(guān)鍵詞:機(jī)制

      孫永欣 姚剛 于挺敏 滿玉紅

      [摘要] 緊張型頭痛(TTH)是最常見的原發(fā)性頭痛類型,目前對(duì)其仍缺少足夠重視。外周致敏、顱周肌肉壓痛及肌肉的異常活動(dòng)、中樞神經(jīng)系統(tǒng)疼痛調(diào)節(jié)機(jī)制異常、細(xì)胞因子及炎性介質(zhì)的代謝紊亂等因素可能從不同方面參與了TTH的發(fā)病過程。電生理技術(shù)、神經(jīng)影像技術(shù)及檢驗(yàn)技術(shù)為TTH發(fā)病機(jī)制的研究提供了有效手段。本文對(duì)TTH可能的發(fā)病機(jī)制及相應(yīng)研究進(jìn)展進(jìn)行簡(jiǎn)要概括,以期加深對(duì)此疾病的了解,為基礎(chǔ)研究及臨床診療提供參考。

      [關(guān)鍵詞] 緊張型頭痛;機(jī)制;外周致敏;中樞疼痛調(diào)節(jié)

      [中圖分類號(hào)] R255? ? ? ? ? [文獻(xiàn)標(biāo)識(shí)碼] A? ? ? ? ? [文章編號(hào)] 1673-7210(2019)01(c)-0037-04

      [Abstract] Tension-type headache (TTH) is the most common type of primary headache, which is still lacking enough attention. Factors such as peripheral sensitization, craniocerebral muscle tenderness and abnormal muscle activity, abnormal regulation mechanism of central nervous system pain, cytokines and metabolic disorders of inflammatory mediators may participate in the pathogenesis of TTH from different aspects. Electrophysiological techniques, neuroimaging techniques and testing techniques provide an effective means for the study of the pathogenesis of TTH. This article briefly summarizes the possible pathogenesis of TTH and the corresponding research progress, in order to deepen the understanding of this disease, and provide reference for basic research and clinical diagnosis and treatment.

      [Key words] Tension-type headache; Pathogenesis; Peripheral sensitization; Central pain regulation

      緊張型頭痛(tension-type headache,TTH)在國(guó)際頭痛疾病分類第三版(ICHD-3)中被歸類為原發(fā)性頭痛,其根據(jù)頭痛每月發(fā)作頻率可分為偶發(fā)性緊張型頭痛(infrequent episodic tension-type headache,IETTH)、頻發(fā)性緊張型頭痛(frequent episodic tension-type he-adache,F(xiàn)ETTH)及慢性緊張型頭痛(chronic tension-type headache,CTTH)[1],是最為常見的原發(fā)性頭痛。TTH的年患病率僅次于齲齒和潛伏性結(jié)核感染,位列第三位[2],而全球頭痛負(fù)擔(dān)調(diào)查[3]顯示,TTH的年患病率為11%~45%。目前,TTH的發(fā)病機(jī)制尚未完全闡明,多種因素可能參與其中。本文簡(jiǎn)要綜述了TTH可能的發(fā)病機(jī)制及研究進(jìn)展,以期為其臨床治療提供參考。

      1 觸痛點(diǎn)和外周致敏

      觸痛點(diǎn)(triger points,TrPS)是骨骼肌緊張帶中對(duì)壓力高度敏感的區(qū)域,當(dāng)受到刺激時(shí),可引起局部疼痛或遠(yuǎn)隔部位的牽涉痛[4]。與TTH有關(guān)的TrPS主要分布在三叉神經(jīng)支配的顳肌、咬肌以及C1-C3支配的斜方肌、胸鎖乳突肌[5]。ETTH患者頭頸部肌肉TrPS反復(fù)注射利多卡因后,頭痛持續(xù)時(shí)間縮短,疼痛程度降低[6],提示TrPS在TTH的發(fā)展過程中起到重要作用。CTTH患者斜方肌TrPS周圍1~2 mm內(nèi)可見持續(xù)性自發(fā)肌電活動(dòng),認(rèn)為這種肌電活動(dòng)源自梭內(nèi)肌纖維的持續(xù)收縮[7]。另有研究[8]顯示,TrPS處致痛性化學(xué)因子如5-羥色胺(5-hydroxytryptamine,5-HT)、緩激肽(bradykinin,BK)、降鈣素基因相關(guān)肽(calcitoningene related peptide,CGRP)、P物質(zhì)(substance P,SP)等的濃度顯著升高。由此可見,TrPS處持續(xù)的低水平肌肉活動(dòng)可能會(huì)損害肌肉纖維,引起局部致痛物質(zhì)的聚集,進(jìn)而刺激外周傷害性感受器導(dǎo)致疼痛。外周傷害性感受器為游離神經(jīng)末梢,主要分布在骨骼肌、動(dòng)脈壁和結(jié)締組織中,由Aδ類或C類神經(jīng)纖維介導(dǎo)[9]。致痛物質(zhì)可提高外周傷害性感受器的興奮性,降低其反應(yīng)閾值,即產(chǎn)生外周致敏效應(yīng),參與TTH的發(fā)生。外周傷害性感受器痛覺信息的持續(xù)傳入可引起中樞神經(jīng)系統(tǒng)的敏化,進(jìn)而導(dǎo)致TTH的慢性化。

      2 顱周肌肉壓痛和頭頸部肌肉異?;顒?dòng)

      Jensen等[10]通過對(duì)58例TTH患者及30例健康對(duì)照進(jìn)行持續(xù)30 min咬合試驗(yàn),發(fā)現(xiàn)68%的TTH患者和17%的健康人可在24 h內(nèi)誘發(fā)出頭痛,且顱周肌肉壓痛值在頭痛發(fā)生之前即增高,在未誘發(fā)出現(xiàn)頭痛的患者中,顱周肌肉壓痛值保持穩(wěn)定,認(rèn)為顱周肌肉壓痛先于頭痛出現(xiàn)并可能導(dǎo)致頭痛。但也有研究[11]發(fā)現(xiàn),CTTH患者頭痛發(fā)作之前,顱周肌肉壓痛值可保持正常水平。Mingels等[12]一項(xiàng)針對(duì)女性ETTH患者的橫斷面研究顯示,ETTH患者在頭痛發(fā)作間期顱周肌肉壓痛值明顯增加,且與每月疼痛發(fā)作頻率有關(guān),與頭痛程度及持續(xù)時(shí)間無(wú)關(guān)。顱周肌肉壓痛值增加可能和外周致敏及中樞神經(jīng)系統(tǒng)疼痛調(diào)節(jié)功能障礙有關(guān)[13],但顱周肌肉壓痛值增加是導(dǎo)致頭痛的原因還是頭痛繼發(fā)性表現(xiàn)目前仍需進(jìn)一步研究證實(shí)。頭頸部肌肉異?;顒?dòng)也可能參與TTH的發(fā)生。研究[14]顯示,與健康對(duì)照組比較,CTTH患者在頸部屈伸運(yùn)動(dòng)時(shí),拮抗肌的肌電活動(dòng)顯著增強(qiáng),這可能導(dǎo)致肌肉負(fù)荷增加,促進(jìn)傷害性信息的傳入,從而參與頭痛產(chǎn)生。

      3 中樞疼痛調(diào)節(jié)機(jī)制異常

      中樞神經(jīng)系統(tǒng)疼痛調(diào)節(jié)機(jī)制的異??赡軈⑴c了TTH的痛覺維持及慢性化。外周感受抑制實(shí)驗(yàn)(exteroceptive suppression,ES)被認(rèn)為是研究TTH疼痛中樞調(diào)控機(jī)制的有效方案,該實(shí)驗(yàn)通過對(duì)三叉神經(jīng)第1、2支分布區(qū)進(jìn)行電或機(jī)械刺激引起咀嚼肌自主收縮活動(dòng)反射性抑制,其在肌電圖(EMG)上表現(xiàn)為第一外感受抑制期(ES1)(產(chǎn)生于刺激后10~20 ms)和第二外感受抑制期(ES2)(產(chǎn)生于刺激后45~55 ms),其中,ES1屬腦干內(nèi)少突觸環(huán)路反射,而ES2屬多突觸環(huán)路反射,其活動(dòng)受邊緣系統(tǒng)調(diào)控。CTTH患者ES2時(shí)限縮短,而ETTH患者ES2時(shí)限正常,提示腦干抑制性中間神經(jīng)元活動(dòng)不良或被抑制過度,從而導(dǎo)致邊緣系統(tǒng)發(fā)放的沖動(dòng)傳導(dǎo)不良或被阻斷[15],客觀上反映了CTTH患者中樞性疼痛調(diào)控機(jī)制異常。通過對(duì)ES2的藥理調(diào)控研究[15],發(fā)現(xiàn)介導(dǎo)ES2的抑制性中間神經(jīng)元可被5-羥色胺能傳導(dǎo)通路抑制,阿米替林(5-HT再攝取抑制劑)可縮短CTTH患者ES2時(shí)限。CTTH患者傷害性屈曲反射(nociceptive flexion reflex,NFR)的反應(yīng)閾值及痛覺耐受閾值較健康對(duì)照組明顯降低,提示中樞內(nèi)源性下行疼痛調(diào)控系統(tǒng)功能不良[16]。NFR由脊髓介導(dǎo),受中樞神經(jīng)系統(tǒng)下行疼痛調(diào)節(jié)系統(tǒng)調(diào)控。上述觀點(diǎn)還可通過對(duì)彌漫性傷害刺激抑制性控制(diffuse noxious inhibitory controls,DNIC)的研究進(jìn)一步證實(shí)。Sandrini等[17]對(duì)CTTH患者進(jìn)行冷壓試驗(yàn),發(fā)現(xiàn)將CTTH患者一側(cè)上肢浸入5~6℃的冷水后對(duì)其對(duì)側(cè)股二頭肌進(jìn)行電刺激,NFR呈現(xiàn)易化,其反應(yīng)閾值較基礎(chǔ)值降低,提示DNIC效應(yīng)減弱,客觀反映了中樞疼痛調(diào)節(jié)系統(tǒng)的異常。

      Schmidt-Wilcke[18]通過核磁平掃及象素分析發(fā)現(xiàn),CTTH患者大腦中參與疼痛處理的區(qū)域(包括扣帶回前部、島葉、額葉皮質(zhì)、海馬旁回等)灰質(zhì)體積較健康人明顯減小,減小程度與頭痛持續(xù)時(shí)間呈正相關(guān),并認(rèn)為這一改變是中樞神經(jīng)系統(tǒng)敏化的結(jié)果。上述區(qū)域灰質(zhì)體積的減少可能反映了抑制性下行疼痛調(diào)節(jié)系統(tǒng)功能受損,但這一結(jié)果仍有待進(jìn)一步研究證實(shí)。

      4 神經(jīng)遞質(zhì)及炎性因子代謝紊亂

      5-HT廣泛參與中樞神經(jīng)系統(tǒng)疼痛調(diào)控。Bendtsen等[19]研究發(fā)現(xiàn),ETTH患者血小板5-HT水平升高,而其在CTTH患者中降低,但血漿5-HT水平在ETTH患者中升高,在CTTH患者中則保持正常,其認(rèn)為這一現(xiàn)象與ETTH患者中樞疼痛抑制系統(tǒng)代償有關(guān),而在CTTH患者的這種代償能力可能不足,進(jìn)而促進(jìn)了頭痛的維持。另有文獻(xiàn)[20]報(bào)道,CTTH患者在接受靜脈注射一氧化氮合成酶抑制劑L-單甲基精氨酸后,疼痛程度較安慰劑組降低,提示一氧化氮可能參與TTH的發(fā)展。一氧化氮可使傳入神經(jīng)末梢釋放遞質(zhì)增加,局部前列腺素聚集,提高突觸后膜N-甲基-D-天冬氨酸受體反應(yīng)性,進(jìn)而引起脊髓背角神經(jīng)元的活化,促進(jìn)痛覺信息的傳遞[21]。

      炎性細(xì)胞因子也可能參與TTH的產(chǎn)生和維持。Della等[22]通過測(cè)定56例CTTH患者及42名健康對(duì)照的血清炎性細(xì)胞因子濃度發(fā)現(xiàn),CTTH患者血清中白細(xì)胞介素-1β(interleukin-1β,IL-1β)濃度較對(duì)照組顯著升高。另有報(bào)道[23],CTTH患者IL-6的濃度也較健康對(duì)照組升高,但差異無(wú)統(tǒng)計(jì)學(xué)意義。鞏曉英等[24]研究發(fā)現(xiàn),TTH患者血清IL-8水平較健康對(duì)照組顯著升高,且IL-8水平與疼痛視覺模擬評(píng)分呈正相關(guān)。外周炎性細(xì)胞因子水平的升高可提升外周感受神經(jīng)元的活性,進(jìn)而促進(jìn)痛覺信息的傳遞,并參與中樞神經(jīng)系統(tǒng)敏化。Neeb等[25]研究發(fā)現(xiàn),IL-1β可通過環(huán)氧酶(COX)途徑誘導(dǎo)降鈣素基因相關(guān)肽(CGRP)在三叉神經(jīng)節(jié)細(xì)胞中的合成,參與中樞神經(jīng)系統(tǒng)血管炎性反應(yīng)及肥大細(xì)胞的釋放,進(jìn)而參與頭痛的痛覺維持。然而,炎性細(xì)胞因子和TTH的關(guān)系仍有待深入研究。

      綜上所述,TTH的發(fā)病機(jī)制較為復(fù)雜,某些具體機(jī)制尚需進(jìn)一步研究。值得注意的是,由于TTH的臨床癥狀較偏頭痛等其他頭痛癥狀較輕,臨床醫(yī)生及患者對(duì)該病關(guān)注均相對(duì)較少,從而導(dǎo)致對(duì)該病認(rèn)識(shí)不足,易發(fā)生錯(cuò)誤的診斷及治療,這可能會(huì)導(dǎo)致患者反復(fù)就醫(yī),進(jìn)而對(duì)患者身心造成傷害[26-27]。目前,隨著技術(shù)手段的發(fā)展及對(duì)疾病認(rèn)識(shí)的不斷深入,TTH、偏頭痛等其他頭痛的治療手段正逐步多樣化[28-30]。通過對(duì)TTH發(fā)病機(jī)制的探討,有助于進(jìn)一步加深對(duì)該病的了解,為相關(guān)基礎(chǔ)研究及臨床工作提供參考。

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      [26]? 李娜,杜衍君,邢舒平,等.388例緊張型頭痛病人臨床分析[J].中國(guó)疼痛醫(yī)學(xué)雜志,2018(1):71-74.

      [27]? 鐘傳飄.慢性非器質(zhì)性頭痛及焦慮抑郁情緒的關(guān)系分析[J].中國(guó)醫(yī)藥科學(xué),2018,8(2):180-182,194.

      [28]? 邱芳暉,陳淑萍.刺血療法結(jié)合電針治療偏頭痛的臨床研究[J].中國(guó)現(xiàn)代醫(yī)生,2018,56(15):127-130.

      [29]? 胡文舉,孟志劍.活血祛風(fēng)通絡(luò)湯聯(lián)合針灸治療神經(jīng)性頭痛的療效觀察[J].中國(guó)醫(yī)院用藥評(píng)價(jià)與分析,2017, 17(2):184-185,188.

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      (收稿日期:2018-09-30? 本文編輯:王? ?蕾)

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