Current situation of clinical application for cough peak flow and prospects of future research
ZHANG Yan, CHEN Yuhong*, FENG Ping
Nanjing First Hospital, Nanjing Medical University, Jiangsu 210006 China
*Corresponding Author "CHEN Yuhong,"E?mail:"zywmwjy@126.com
Keywords""cough peak flow; application status; nursing; review
摘要""咳嗽是一種正常的保護(hù)機(jī)制,用于清除氣管或支氣管中的分泌物和吸入的異物,有效的咳嗽可有效預(yù)防肺部感染和肺不張,然而目前臨床較少有指標(biāo)可用以客觀評(píng)價(jià)病人的咳嗽能力??人苑辶髁繎{借測(cè)量的可重復(fù)性、經(jīng)濟(jì)性和易用性已經(jīng)在多個(gè)領(lǐng)域展現(xiàn)了它的應(yīng)用價(jià)值,主要綜述咳嗽峰流量在臨床的應(yīng)用現(xiàn)狀,并對(duì)其未來(lái)的研究方向做出展望。
關(guān)鍵詞""咳嗽峰流量;應(yīng)用現(xiàn)狀;護(hù)理;綜述
doi:10.12102/j.issn.1009-6493.2024.20.021
咳嗽是一個(gè)復(fù)雜的過(guò)程,它是一種爆發(fā)性呼氣,有時(shí)是反射性的,有時(shí)是自愿的或受意識(shí)支配的??人允且环N正常的保護(hù)機(jī)制,用于清除氣管或支氣管中的分泌物和吸入的異物[1]??人杂?個(gè)重要的部分組成,分別是吸氣、在聲門(mén)關(guān)閉的情況下用力呼氣以及在聲門(mén)開(kāi)放的瞬間將肺內(nèi)的氣體猛烈咳出[2]。肺內(nèi)氣體的快速排出可沿著呼吸道內(nèi)壁從遠(yuǎn)端向近端清除呼吸道內(nèi)的分泌物[3?4]。要使這一機(jī)制順利進(jìn)行,必須同時(shí)具備完整的神經(jīng)肌肉活動(dòng)和有效的協(xié)調(diào)性。其中任何一個(gè)環(huán)節(jié)發(fā)生變化都會(huì)降低咳嗽的效果,從而使病人容易發(fā)生呼吸道感染和肺不張。有效的咳嗽還可預(yù)防術(shù)后發(fā)生肺部感染和肺不張,并通過(guò)清除分泌物保持氣道通暢[5]。然而,目前臨床較少有指標(biāo)可用以客觀評(píng)價(jià)病人的咳嗽能力,常用的咳嗽半定量量表(Semi?quantitative Cough Strength Score,SCSS)及白卡實(shí)驗(yàn)(White Card Test,WCT)在評(píng)價(jià)上均存在一定主觀性[6]。因此,臨床需要一種量化的客觀指標(biāo)評(píng)價(jià)病人的咳嗽能力,于是咳嗽峰流量(CPF)的測(cè)量在臨床逐漸受到關(guān)注。CPF是咳嗽過(guò)程中聲門(mén)突然開(kāi)放后產(chǎn)生的最大呼氣流速,是評(píng)價(jià)病人咳嗽強(qiáng)度的敏感指標(biāo),能夠反映氣道阻力和呼吸道肌肉力量。最早關(guān)于CPF正常值的研究發(fā)表于1966年[7],對(duì)于沒(méi)有肺部基礎(chǔ)疾病的正常人CPF值應(yīng)為360~400 L/min[8?9]。CPF目前主要應(yīng)用于罹患神經(jīng)?肌肉疾?。∟MD)的病人中,并且對(duì)于機(jī)械通氣病人拔管成功率的預(yù)測(cè)方面也有應(yīng)用。本研究綜述了CPF測(cè)量目前在臨床中的應(yīng)用現(xiàn)狀,并對(duì)未來(lái)可以擴(kuò)展的應(yīng)用和研究領(lǐng)域進(jìn)行展望。
1 "CPF的測(cè)量方法
測(cè)量CPF的“金標(biāo)準(zhǔn)”為呼氣氣流計(jì)速器,通過(guò)被稱(chēng)為“毛細(xì)血管”的微管將咳嗽轉(zhuǎn)化為線性流動(dòng),并測(cè)量從近端點(diǎn)到遠(yuǎn)端點(diǎn)流量的下降并將其轉(zhuǎn)換為流速。這是一種非常精確的設(shè)備,很多發(fā)達(dá)國(guó)家的肺功能實(shí)驗(yàn)室已經(jīng)開(kāi)始通過(guò)它測(cè)量第1秒用力呼氣容積(FEV1)、用力肺活量(FVC)以及小氣道內(nèi)的氣流。不過(guò),由于便攜性、可重復(fù)利用性、經(jīng)濟(jì)性和易用性等特點(diǎn),肺活量?jī)x和峰流量?jī)x也常被用來(lái)測(cè)量CPF[10?18]。盡管有很多實(shí)驗(yàn)都強(qiáng)調(diào)了不同儀器的測(cè)量方法可能會(huì)導(dǎo)致病人CPF值出現(xiàn)誤差,但很少有實(shí)驗(yàn)去研究不同設(shè)備在測(cè)量CPF時(shí)的差異度。Sancho等[19]使用肺活量?jī)x和峰流量?jī)x分別測(cè)量患有神經(jīng)?肌肉疾病的病人CPF,結(jié)果顯示2種測(cè)量方法最終的測(cè)量平均值相差66 L/min。Kulnik等[20]比較了傳統(tǒng)峰流量?jī)x和呼氣氣流計(jì)速器,以呼氣氣流計(jì)速器作為參照標(biāo)準(zhǔn),結(jié)果顯示,傳統(tǒng)峰流量?jī)x測(cè)量值與之相差高達(dá)150 L/min。在一項(xiàng)關(guān)于杜氏肌肉萎縮癥(DMD)病人的研究中,Kikuchi等[21]觀察比較了幾種不同CPF測(cè)量裝置在CPF最終測(cè)量值之間的差異,在肺活量?jī)x和機(jī)械吹氣?呼氣裝置以及峰流量?jī)x之間進(jìn)行對(duì)比最大差距為50 L/min。這些研究均闡述了CPF測(cè)量的重要性但也論述了不同測(cè)量裝置會(huì)產(chǎn)生一定的數(shù)值差異。
2 "CPF在神經(jīng)肌肉疾病病人中的應(yīng)用
一項(xiàng)包含50例神經(jīng)?肌肉疾病病人的研究發(fā)現(xiàn),輔助CPFgt;180 L/min的病人相較于輔助CPFgt;150 L/min的病人有更高的存活率[22]。然而,Bach等[23]研究了49例運(yùn)動(dòng)神經(jīng)元疾?。∕ND)病人,研究發(fā)現(xiàn)將CPFgt;160 L/min作為這些病人機(jī)械通氣脫機(jī)的條件尚不充分。Tilanus等[24]在一項(xiàng)包含87例MND病人的研究發(fā)現(xiàn),相較于FVC、最大吸氣壓(MIP)、最大呼氣壓(MEP)、最大經(jīng)鼻吸氣壓力(SNIP)這些肺功能指標(biāo),無(wú)輔助的CPF值對(duì)于神經(jīng)?肌肉疾病病人的居家無(wú)創(chuàng)呼吸機(jī)的使用指征有著更好的預(yù)測(cè)效果。Bach等[25]研究了25例DMD且出現(xiàn)上呼吸道感染病人的遠(yuǎn)期預(yù)后,當(dāng)CPFlt;160 L/min時(shí),認(rèn)為病人會(huì)出現(xiàn)無(wú)效的咳嗽,當(dāng)CPFgt;270 L/min則這些病人后期罹患呼吸衰竭的風(fēng)險(xiǎn)較低。在另一項(xiàng)前瞻性研究中,對(duì)40例MND病人進(jìn)行了為期1年的隨訪,試圖尋找一些可以預(yù)測(cè)病人出現(xiàn)下呼吸道感染的預(yù)測(cè)指標(biāo),最終65%的病人(n=26)出現(xiàn)了下呼吸道感染,收集這些病人的基線數(shù)據(jù),包括FEV1、FVC、1秒率(FEV1/FVC)、CPF、MIP、MEP等,CPFlt;255 L/min被認(rèn)為是無(wú)效咳嗽的最佳變量之一(Plt;0.001)[26]。
3 "CPF對(duì)于氣管插管病人脫機(jī)拔管的預(yù)測(cè)作用
CPF在預(yù)測(cè)高位脊髓損傷、原發(fā)性神經(jīng)肌肉疾病、長(zhǎng)時(shí)間呼吸衰竭或ICU獲得性衰弱病人機(jī)械通氣的脫機(jī)失敗方面也有作用。拔管后再插管的一個(gè)常見(jiàn)原因是病人虛弱的咳嗽力度,預(yù)示著較差的氣道清潔能力[27?29]。未使用鎮(zhèn)靜的機(jī)械通氣病人在自主呼吸實(shí)驗(yàn)(spontaneous breathing trial,SBT)通過(guò)后,使用峰流量?jī)x直接連接在氣管插管的遠(yuǎn)端,囑病人用力咳嗽,將峰流量?jī)x上測(cè)得的3次最高數(shù)值記錄下來(lái),結(jié)果顯示,經(jīng)氣管插管測(cè)量的CPF值gt;60 L/min可以成功預(yù)測(cè)拔管的成功。除此之外,CPF值也與ICU住院時(shí)長(zhǎng)、住院費(fèi)用、ICU病人的生存率和死亡率有一定的相關(guān)性[30?32],值得未來(lái)進(jìn)一步深入研究。CPF目前也被用于預(yù)測(cè)神經(jīng)外科病人氣管切開(kāi)后能否成功脫機(jī)[31]。
4 "CPF在帕金森病、腦卒中和老年病人中的應(yīng)用
帕金森?。≒arkinson's disease,PD)病人都存在不同程度的吞咽障礙或吞咽困難[33]。Ebihara等[34]研究了帕金森病早期和晚期病人在咳嗽運(yùn)動(dòng)和感覺(jué)方面的差異,結(jié)果顯示,早期帕金森病病人的CPF值為(230±74)L/min,而晚期帕金森病病人的平均CPF值為(186±60)L/min,無(wú)論早期還是晚期帕金森病人的CPF值都與同齡健康人群對(duì)照組[(316±70)L/min]有著顯著差異。
急性腦卒中病人由于咳嗽反射受損,隨之而來(lái)往往會(huì)產(chǎn)生吞咽困難和誤吸等嚴(yán)重并發(fā)癥,對(duì)于病人主動(dòng)咳嗽能力的客觀測(cè)量可以幫助識(shí)別有誤吸風(fēng)險(xiǎn)的腦卒中病人,今后可作為一種床邊應(yīng)用的輔助評(píng)估工具。在一項(xiàng)對(duì)比腦卒中和非腦卒中病人自主咳嗽能力的對(duì)照試驗(yàn)中,研究發(fā)現(xiàn)所有腦卒中病人的咳嗽能力都有受損,而且出現(xiàn)了嚴(yán)重誤吸現(xiàn)象的腦卒中病人比尚未出現(xiàn)誤吸的腦卒中病人CPF值下降得更為顯著[35]。Kimura等[36]一項(xiàng)關(guān)于腦卒中伴有吞咽困難病人與正常對(duì)照組人群的CPF比較研究中,腦卒中伴有吞咽困難的病人CPF值顯著低于正常人,較高的咳嗽流量峰值可降低急性腦卒中病人發(fā)生肺炎的風(fēng)險(xiǎn)。
即便在健康的老年人群體中,由于年齡相關(guān)的肺生理變化以及呼吸肌群的減少,有效的咳嗽能力依然在下降[37]。由于胸壁順應(yīng)性降低,肺部難以充氣,肺部彈性回縮力減少和年齡相關(guān)的氣流阻塞,肺部難以快速將氣體排空[37]。Kaneko等[38]研究顯示,有26%的老年病人CPF值出現(xiàn)顯著降低(CPFlt;240 L/min),和CPF下降不顯著的老年人相比,這些個(gè)體往往有著更低的FVC、MIP、MEP,更差的胸廓順應(yīng)性和更糟糕的體能表現(xiàn),F(xiàn)VC和MIP與老年人的CPF成獨(dú)立相關(guān)并且對(duì)CPF的降低有著良好的預(yù)測(cè)作用。
5 "CPF在慢性阻塞性肺疾?。–OPD)病人中的應(yīng)用
目前,CPF在COPD病人中的應(yīng)用研究較少,2014年一項(xiàng)小型研究測(cè)量了20例FEV1lt;30%的嚴(yán)重COPD病人的肺活量和CPF,該試驗(yàn)將過(guò)去1年中少于2次病情惡化的病人定義為COPD穩(wěn)定期病人,與過(guò)去1年內(nèi)出現(xiàn)3次及以上病情惡化的COPD病人進(jìn)行對(duì)比。結(jié)果顯示,頻繁出現(xiàn)COPD病情加重組病人CPF的數(shù)值較COPD穩(wěn)定期病人更低,并且動(dòng)脈血?dú)庋醴謮海≒aO2)也出現(xiàn)了明顯的下降[39]。
另一項(xiàng)小型研究(n=29)研究了人工輔助咳嗽和機(jī)械輔助咳嗽裝置應(yīng)用效果的差異性,該研究包括8例COPD病人以及神經(jīng)肌肉疾病病人和健康人群對(duì)照組。結(jié)果表明COPD病人無(wú)論是聯(lián)合人工輔助咳嗽還是機(jī)械輔助咳嗽,COPD病人的CPF值都較正常人群組有很大的降低,該研究還大膽預(yù)測(cè)可以進(jìn)一步跟蹤隨訪監(jiān)測(cè)出院的慢性阻塞性肺疾病急性加重期(acute exacerbation of chronic obstructive pulmonary disease,"AECOPD)病人的CPF值,認(rèn)為這樣可以解釋那些CPF沒(méi)有改善的AECOPD病人出院后再入院的原因[40]。
6 "小結(jié)
目前,關(guān)于CPF應(yīng)用研究的相關(guān)文獻(xiàn)較少,臨床上關(guān)于CPF測(cè)量的一些相關(guān)初級(jí)研究主要集中于神經(jīng)肌肉疾病相關(guān)的呼吸衰竭病人,以及在重癥監(jiān)護(hù)領(lǐng)域?qū)PF應(yīng)用于擁有人工氣道的機(jī)械通氣病人是否能夠脫離呼吸機(jī)的相關(guān)預(yù)測(cè)。最近,CPF還被發(fā)現(xiàn)可以作為預(yù)測(cè)急性腦卒中或者其他原因?qū)е峦萄收系K病人咳嗽強(qiáng)度和誤吸風(fēng)險(xiǎn)的有效工具,可有效幫助識(shí)別這類(lèi)病人出現(xiàn)誤吸或誤吸性肺炎的風(fēng)險(xiǎn)。CPF應(yīng)用于MND病人中可以準(zhǔn)確預(yù)測(cè)病人出現(xiàn)下呼吸道感染的風(fēng)險(xiǎn)以及需要使用無(wú)創(chuàng)呼吸機(jī)輔助呼吸的時(shí)機(jī)。
未來(lái)研究中CPF還有巨大的應(yīng)用空間和潛力,例如在慢性呼吸系統(tǒng)疾病的病人中CPF也許可以用來(lái)解釋有些病人容易出現(xiàn)病情惡化的原因;在外科護(hù)理領(lǐng)域,對(duì)于那些術(shù)后容易出現(xiàn)肺部并發(fā)癥、呼吸衰竭的病人,可以嘗試測(cè)量CPF早期識(shí)別容易發(fā)生肺部并發(fā)癥的高風(fēng)險(xiǎn)病人以便及時(shí)干預(yù);在危重癥護(hù)理領(lǐng)域,CPF除了可以預(yù)測(cè)病人是否可以脫機(jī)成功,也可以嘗試用來(lái)客觀評(píng)價(jià)病人的咳嗽強(qiáng)度,幫助識(shí)別容易出現(xiàn)肺部并發(fā)癥或呼吸衰竭的高風(fēng)險(xiǎn)病人或作為肺部護(hù)理效果的評(píng)價(jià)指標(biāo)等。未來(lái)關(guān)于CPF在護(hù)理中的臨床應(yīng)用還有巨大的空間,值得進(jìn)一步深入的臨床研究去證實(shí)其應(yīng)用價(jià)值。
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(收稿日期:2023-09-11;修回日期:2024-08-03)
(本文編輯"蘇琳)