俞 帥,張 雁,陳 楠,潘曉霞,歐陽(yáng)彥,張敏芳,劉少軍,馬 駿,王 駿
(1. 上海市靜安區(qū)中心醫(yī)院 心內(nèi)科,上海 200040;2. 上海交通大學(xué)附屬瑞金醫(yī)院 腎臟科,上海 200025;3. 上海交通大學(xué)附屬仁濟(jì)醫(yī)院 腎臟科,上海 200127;4. 復(fù)旦大學(xué)附屬華山醫(yī)院 腎內(nèi)科,上海 200040; 5. 上海市靜安區(qū)中心醫(yī)院 腎內(nèi)科,上海 200040)
法布里病(Fabry病MIM301500)最早于1898年分別由兩位皮膚科醫(yī)生William Anderson(德國(guó))和Johannes Fabry(英國(guó))所報(bào)道,故又稱作“Anderson-Fabry病”(Anderson-Fabry Disease,AFD),該病是一種罕見的X連鎖隱性遺傳的溶酶體貯積病,其發(fā)病與α-半乳糖苷酶A(α-GalA)基因突變有關(guān),從而導(dǎo)致α-GalA活性部分或全部喪失,造成其代謝底物在人體心臟、腎臟、皮膚、神經(jīng)等各器官和組織大量貯積,引起多器官組織的病理性改變[1-2]。Fabry病累及心臟可表現(xiàn)為心肌肥厚(主要為左心室肥厚)、心臟瓣膜病變、心律失常,嚴(yán)重者可導(dǎo)致心力衰竭、心肌梗死[3-8]。上海市靜安區(qū)中心醫(yī)院收治1例Fabry病致心肌梗死合并心力衰竭患者,報(bào)告如下。
患者,男,61歲,因“胸悶1個(gè)月伴氣促3周”于2015年5月7日就診于上海市靜安區(qū)中心醫(yī)院心內(nèi)科,患者1個(gè)月前無(wú)明顯誘因出現(xiàn)胸悶不適,位于胸骨后,呈持續(xù)性壓迫感,當(dāng)時(shí)未至醫(yī)院就診;2天后胸悶有所減輕;3周前患者出現(xiàn)氣促,活動(dòng)后明顯,活動(dòng)耐量較前明顯下降,走平路20 m或登2樓即出現(xiàn)氣促,休息后可緩解,入院前3天(2015年5月4日)患者靜息狀態(tài)下亦感氣促伴夜間陣發(fā)性呼吸困難,至外院查心電圖示DDD起搏器,房室順序起搏,頻發(fā)房性早搏,頻發(fā)室性早搏,短陣加速室性自主心律。超聲心動(dòng)圖示左室肥大伴左右室壁收縮活動(dòng)減弱,左室EF為35%,左房增大伴輕中度二尖瓣反流,中重度肺動(dòng)脈高壓,少量心包積液??紤]心力衰竭,予以呋塞米、多巴胺等治療后癥狀無(wú)明顯緩解,遂至本院就診?;颊哂?001年因“病態(tài)竇房結(jié)綜合癥”在外院行DDD起搏器植入術(shù),2010年行起搏器更換術(shù)。近3年患者出現(xiàn)間歇性胸悶伴泡沫尿,未予重視。患者否認(rèn)高血壓病、糖尿病、吸煙及心臟病家族史。
入院查體:體溫36.8 ℃,脈搏75次/min,呼吸18次/min,血壓120/80 mmHg,雙側(cè)頸靜脈怒張,兩肺底可聞及細(xì)濕羅音。心臟向左擴(kuò)大,心律齊,心尖區(qū)和三尖瓣區(qū)可聞及2~3級(jí)返流樣收縮期雜音。腹部平軟,肝臟肋下4 cm,質(zhì)中,肝頸反流征(+),雙下肢輕度凹陷性浮腫。
入院后完善血常規(guī)、血液生化(肝腎功能、電解質(zhì)、血糖血脂)、心肌標(biāo)志物(心肌酶譜、cTnT)、NT-proBNP、24 h尿蛋白定量、心電圖、胸片、超聲心動(dòng)圖、肺功能等常規(guī)檢查。必要時(shí)根據(jù)病情及檢查結(jié)果進(jìn)行腎穿刺活檢、冠狀動(dòng)脈造影檢查。
血常規(guī):白細(xì)胞計(jì)數(shù)13.11×109/L,紅細(xì)胞計(jì)數(shù)4.1×1012/L,血紅蛋白126 g/L,血小板計(jì)數(shù)232×109/L,中性粒細(xì)胞88.8%,中性粒細(xì)胞絕對(duì)值11.64×109/L,淋巴細(xì)胞8.2%??偟鞍?3 g/L,白蛋白25 g/L,肝功能、血糖、血脂等指標(biāo)正常。尿素氮9.45 mmol/L,肌酐113 μmol/L,尿酸394 μmol/L。心肌酶譜:CK-MB同工酶9.7 ng/mL,肌紅蛋白72 ng/mL,肌鈣蛋白T 0.122 ng/mL,NT-proBNP 2808 pg/mL。24 h尿蛋白定量檢查尿量2600 mL,24 h尿總蛋白286 mg。
2015年5月4日外院心電圖提示DDD起博器,房室順序起搏,頻發(fā)房性早搏,頻發(fā)室性早搏,短陣加速室性自主心律(見圖1)。與2月前本院門診隨訪(圖2)對(duì)比,V4-V6導(dǎo)聯(lián)T波深倒。5月7日心電圖示DDD起搏器,房室順序起搏心律,感知及奪獲功能未見異常,房性早搏,V4-V6導(dǎo)聯(lián)T波直立(圖3)。胸片提示兩肺紋理增多,心臟明顯擴(kuò)大(圖4)。超聲心動(dòng)圖提示左心室增大,左心室壁各節(jié)段均勻增厚,收縮活動(dòng)普遍減弱,二尖瓣中度反流,三尖瓣中度反流,肺動(dòng)脈瓣輕度反流,少量心包積液,EF 28%,見“雙軌征”(即左心室心內(nèi)膜出現(xiàn)“雙軌”現(xiàn)象(圖5)。肺功能提示以中度阻塞為主的混合性通氣功能障礙。
圖1 患者急診心電圖,與發(fā)病前2個(gè)月心電圖(圖2)對(duì)比可見V4-V6導(dǎo)聯(lián)T波倒置Fig 1 Electrocardiogram in the emergency room. Compared to the electrocardiogram performed 2 months ago (Fig 2), V4-V6 lead T wave inversion was seen
圖2 患者本次發(fā)病前2個(gè)月心電圖Fig 2 Electrocardiogram 2 months before the onset of current disease
圖3 患者入院后心電圖可見V4-V6導(dǎo)聯(lián)T波與前比較存在動(dòng)態(tài)改變Fig 3 Electrocardiogram showed a dynamic change in V4-V6 lead T wave after admission
圖4 胸片提示患者心影增大Fig 4 Chest X-ray indicated enlargement of the heart
圖5 超聲心動(dòng)圖示心肌肥厚,心肌回聲增強(qiáng),可見雙軌征(箭頭所示)Fig 5 Echocardiography showed myocardial hypertrophy, enhanced echo and double track sign (arrow)
入院后擬診慢性心力衰竭急性發(fā)作,給予利尿(呋塞米+安體舒通20 mg)、擴(kuò)血管(硝酸異山梨酯注射液)、正性肌力(多巴胺100 mg+多巴酚丁胺)治療后患者癥狀稍緩解,但一般日?;顒?dòng)仍感氣促,且有陣發(fā)性夜間臥位憋醒現(xiàn)象,改坐位可逐漸緩解。
鑒于患者先后發(fā)生心臟傳導(dǎo)系統(tǒng)病變、神經(jīng)性耳聾、蛋白尿、腎功能不全、左心室肥厚和心力衰竭,是單病還是共病仍未明確。于上海交通大學(xué)醫(yī)學(xué)院附屬仁濟(jì)醫(yī)院行腎穿刺活檢及電鏡檢查,腎穿刺活檢可見足細(xì)胞大量空泡(圖6),電鏡結(jié)果顯示足突廣泛融合,GBM未見增厚,足細(xì)胞內(nèi)見大量板層狀髓樣小體,系膜基質(zhì)輕度增多,小管上皮細(xì)胞內(nèi)可見較多髓樣小體,小管上皮細(xì)胞壞死,管型形成,符合Fabry病腎臟病理表現(xiàn)(圖7)。
該患者1個(gè)月前曾有持續(xù)性胸悶發(fā)作,1周后出現(xiàn)心衰癥狀,至外院就診,予以利尿劑、血管活性藥物治療效果不明顯,外院急診心電圖(圖1)與患者發(fā)病前2個(gè)月本院門診隨訪心電圖(圖2)對(duì)比,V4-V6導(dǎo)聯(lián)T波出現(xiàn)倒置,本次入院后再次行心電圖檢查(圖3),發(fā)現(xiàn)V4-V6導(dǎo)聯(lián)T波存在動(dòng)態(tài)改變,結(jié)合cTnT異常,需排除非ST段抬高心肌梗死可能。冠狀動(dòng)脈造影檢查顯示左冠優(yōu)勢(shì)型,前降支近段至中段長(zhǎng)病變伴鈣化,局部血栓可能,最重處狹窄約80%,左回旋支遠(yuǎn)段輕度狹窄,右冠發(fā)育細(xì)小,未見明顯異常(圖8A)。對(duì)前降支行IVUS檢查(圖9)提示前將支鈣化斑塊伴血栓。在IVUS指導(dǎo)下對(duì)前降支行PCI術(shù),先后植入XienceP 3.0 mm×38 mm、XienceP 3.5 mm×38 mm支架各1枚(圖7B),術(shù)后常規(guī)他汀類藥物、雙聯(lián)抗血小板治療?;颊卟∏橹饾u平穩(wěn),活動(dòng)耐量較前改善,6 min步行試驗(yàn)420 m,復(fù)查NT-proBNP 653 pg/mL。出院最終診斷為:Fabry病,非ST段抬高心肌梗死,心肌肥厚,慢性心力衰竭(NYHA分級(jí)II級(jí)),F(xiàn)abry病腎病,慢性腎功能不全(CKD3期)。
圖6 足細(xì)胞可見大量空泡(箭頭所示)Fig 6 A large number of vacuoles can be seen in the podocyte (arrow)
圖7 腎穿刺活檢電鏡檢查:可見大量髓樣小體(箭頭所示)Fig 7 Electron microscopic examination of the renal biopsy. A large number of myeloid bodies are seen (arrow)
A:前降支近段至中段長(zhǎng)病變伴鈣化,局部血栓形成,最重處狹窄約80%(箭頭所示),左回旋支遠(yuǎn)段輕度狹窄;B:PCI術(shù)后冠脈造影結(jié)果圖8 冠脈造影檢查Fig 8 Coronary angiography
圖9 血管內(nèi)超聲(IVUS)提示前降支鈣化斑塊及管腔狹窄Fig 9 Intravascular ultrasound showed calcified plaque and lumen stenosis in LAD
患者出院后至瑞金醫(yī)院查α-GalA的活性為0 nmol/(mL·h),同時(shí)完善基因檢查(圖10),發(fā)現(xiàn)該患者的α-半乳糖甘酶A的基因(GLA基因:X144448,全長(zhǎng):4951-15173)存在兩處異常:(1)第5051位發(fā)生點(diǎn)突變:由C變?yōu)門(圖11),由于此位點(diǎn)并非位于蛋白質(zhì)編碼區(qū),因此不會(huì)導(dǎo)致異常;(2)第5078位發(fā)生堿基A缺失,造成移框突變(圖12),此位點(diǎn)位于蛋白質(zhì)編碼區(qū),導(dǎo)致蛋白功能異常。
圖10 GLA基因測(cè)序結(jié)果Fig 10 Sequencing results of GLA gene
圖11 點(diǎn)突變Fig 11 Point mutation
圖12 移框突變Fig 12 Frameshift mutation
心內(nèi)科門診隨訪情況:定期復(fù)查心電圖,2016年10月25日患者再次因“活動(dòng)后胸悶氣促1周”入院,優(yōu)化藥物治療后癥狀改善不明顯,行超聲心動(dòng)圖檢查示EF 30%,且起搏器程控提示電池剩余壽命為6個(gè)月,將起搏器予以升級(jí),行CRT植入術(shù),術(shù)后在組織多普勒超聲顯像下進(jìn)行心室起搏優(yōu)化,調(diào)整最佳VV起搏間期,患者氣促癥狀較入院時(shí)改善,予以出院。出院后患者心內(nèi)科門診隨訪至2017年11月30日,規(guī)范藥物治療中。
Fabry病在全球的發(fā)病率為1/40000~1/117000[9-10],而Spada等[11]報(bào)道男性嬰兒發(fā)病率高達(dá)1/3200~1/4600,該病可累及心臟,但合并心肌梗死罕見報(bào)道。結(jié)合本例,作者檢索2001—2016年共12例Fabry病致心肌梗死相關(guān)文獻(xiàn)[12-21],結(jié)合本例共13例。其中男10例,女3例,年齡28~70歲(其中≤40歲的1例),均以胸悶或胸痛為首發(fā)癥狀,行冠狀動(dòng)脈造影檢查或尸體解剖明確心肌梗死診斷。有心電圖檢查8例(均異常),測(cè)cTnI 5例(均異常),單支血管病變6例,兩支血管病變3例,三支血管病變2例(其中1例未描述病變血管),冠狀動(dòng)脈無(wú)明顯狹窄2例,累及左主干1例,左前降支9例、左旋支3例、右冠狀動(dòng)脈3例,PCI術(shù)8例,CABG術(shù)2例,心肌梗死死亡3例(其中2例為尸體解剖證實(shí))。
Fabry病是引起早發(fā)冠狀動(dòng)脈粥樣硬化性心臟病的一個(gè)危險(xiǎn)因素,約有半數(shù)的Fabry病患者有心絞痛的癥狀[22-23]。Mehta等[24]報(bào)道,在366例Fabry病患者中,69%的男性和65%的女性有心血管癥狀,46%的男性和28%的女性有左室肥厚,并且Fabry病相關(guān)的急性心肌梗死都發(fā)生在相對(duì)年輕的患者[25-27],而多中心的注冊(cè)研究FOS(Fabry Outcome Survey)數(shù)據(jù)庫(kù)中只有極少數(shù)Fabry病患者存在心肌梗死或冠狀動(dòng)脈血運(yùn)重建(coronary revasculazation)病史,推測(cè)其心肌缺血和心絞痛癥狀與微循環(huán)功能障礙有關(guān)[28]。
使用PET-CT對(duì)冠狀動(dòng)脈造影檢查結(jié)果正常的Fabry病患者進(jìn)行研究提示冠狀動(dòng)脈血流儲(chǔ)備減少[29-30]。Fabry病引起心絞痛的機(jī)制可能為:(1)因α-GalA缺乏導(dǎo)致其代謝底物三己糖酰基鞘脂醇和相關(guān)的鞘糖脂在心肌細(xì)胞、血管內(nèi)皮細(xì)胞、血管平滑肌細(xì)胞沉積[31-34]使細(xì)胞功能發(fā)生障礙,同時(shí)誘導(dǎo)肥厚、纖維化及凋亡通路的激活[35]。(2)可能與累及冠狀動(dòng)脈微循環(huán),導(dǎo)致微循環(huán)功能障礙有關(guān)。有文獻(xiàn)報(bào)道1例胸痛的Fabry病患者,冠狀動(dòng)脈造影檢查提示慢血流,心內(nèi)膜心肌活檢除發(fā)現(xiàn)過(guò)度肥大的心肌細(xì)胞內(nèi)存在Fabry病標(biāo)志性的髓樣體超微結(jié)構(gòu)外,還發(fā)現(xiàn)平滑肌細(xì)胞過(guò)度肥大增生導(dǎo)致小動(dòng)脈及壁內(nèi)小動(dòng)脈嚴(yán)重狹窄,平滑肌細(xì)胞內(nèi)的核周空泡,在電鏡下顯示這些空泡是由鞘糖脂在細(xì)胞內(nèi)積聚形成的髓樣小體構(gòu)成[36]。分析Fabry病微循環(huán)障礙灌注不足的原因可能是NO生成減少導(dǎo)致內(nèi)皮功能障礙以及代謝底物的積聚引起平滑肌細(xì)胞肥大增生導(dǎo)致管腔狹窄[37]。
Fabry病常累及多器官,臨床表現(xiàn)多樣,易發(fā)生漏診和誤診,臨床應(yīng)提高警惕。對(duì)于無(wú)法解釋的左心室肥厚,伴或不伴相對(duì)早發(fā)的缺血性心肌病者應(yīng)就Fabry病進(jìn)行鑒別,并仔細(xì)觀察是否存在諸如血管角質(zhì)瘤、肢端感覺(jué)異常、蛋白尿、角膜混濁等Fabry病心外癥狀。超聲心動(dòng)圖“雙軌征”診斷Fabry病的敏感性為94%,特異性為100%[38],同時(shí)仔細(xì)檢查有無(wú)Fabry病心外癥狀,如血管角質(zhì)瘤、肢端感覺(jué)異常、蛋白尿、角膜混濁等,α-GalA活性檢測(cè)有助于進(jìn)一步明確診斷。Fabry病的治療包括非特異性治療和特異性治療,非特異性治療主要針對(duì)各臟器受累情況給予對(duì)應(yīng)的處理,特異性治療指酶替代治療,即利用基因重組技術(shù)體外合成α-GalA替代體內(nèi)缺陷的酶治療Fabry病。理想的治療方案是特異性和非特異性治療相結(jié)合,此外,還有酶增強(qiáng)治療、底物降解治療、蛋白穩(wěn)定性調(diào)節(jié)治療、基因治療等探索性治療方法。
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