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老年口腔衰弱與肌少癥相關(guān)性的研究進(jìn)展

2023-07-15 00:00:00蔣微張劍書劉雪蓮方榮華
關(guān)鍵詞:肌少癥老年人

[摘要]口腔衰弱與肌少癥均是與增齡相關(guān)的老年健康問題??谇凰ト跤绊懯澄镞x擇和營(yíng)養(yǎng)攝入,導(dǎo)致營(yíng)養(yǎng)不良,進(jìn)而影響骨骼肌質(zhì)量,增加肌少癥患病風(fēng)險(xiǎn)。而肌少癥又會(huì)加速吞咽肌肉萎縮,導(dǎo)致肌少性吞咽困難,從而增加營(yíng)養(yǎng)不良風(fēng)險(xiǎn)。本文就老年人口腔衰弱與肌少癥相關(guān)性進(jìn)行綜述,以提高醫(yī)護(hù)工作者對(duì)其重視,從而提高老年人健康水平,促進(jìn)健康老齡化。

[關(guān)鍵詞]老年人;口腔衰弱;肌少癥

doi:10.3969/j.issn.1674-7593.2023.03.023

Research Progress on the Correlation Between Oral Frailty and Sarcopenia in the Elderly

Jiang Wei1,2,Zhang Jianshu1,2,Liu Xuelian1,2,F(xiàn)ang Ronghua1,2**

1General Practice Ward/International Medical Center Ward,General Practice Medical Center,West China Hospital,Sichuan University,Chengdu610041;2West China College of Nursing,Sichuan University,Chengdu610041

**Corresponding author:Fang Ronghua,email:fangronghua@wchscu.cn

[Abstract]Oral frailty and sarcopenia are both age-related health problems in the elderly.Oral frailty can affect food selection and nutrition intake,which may induce malnutrition that can further affect the skeletal muscle mass,eventually leading to the increased risk of sarcopenia.Furthermore,sarcopenia can also have a negative impact on oral health,accelerate pharyngeal muscle atrophy,and result in sarcopenic dysphagia,which may increase the risk of malnutrition.This article reviews the correlation between oral frailty and sarcopenia in the elderly,with the purpose to raise the awareness of health care providers,so as to improve the health condition of the elderly.

[Key words]Elderly;Oral frailty;Sarcopenia

隨著人口老齡化加劇,老年人的生活質(zhì)量受到廣泛關(guān)注。口腔衰弱是老年綜合征的一種,指一系列與衰老相關(guān)的導(dǎo)致口腔結(jié)構(gòu)及功能逐漸衰退的過程和現(xiàn)象。肌少癥是一種漸進(jìn)性廣泛性的全身性骨骼肌疾病,隨年齡增長(zhǎng),全身肌肉質(zhì)量與力量逐漸減退,60~70歲的人群患病率為5%~13%,>80歲的人群患病率為11%~50%[1]。肌少癥可導(dǎo)致吞咽與咀嚼相關(guān)的肌肉萎縮,增加口腔衰弱的易感性??谇凰ト跏估夏耆俗灾鬟M(jìn)食意愿降低,造成營(yíng)養(yǎng)攝入不足,營(yíng)養(yǎng)不良風(fēng)險(xiǎn)增加,從而導(dǎo)致肌肉力量減弱,肌肉質(zhì)量丟失,加劇肌肉萎縮速度,最終發(fā)展為肌少癥。本文對(duì)老年人口腔衰弱與肌少癥的相關(guān)性進(jìn)行綜述,以期為國(guó)內(nèi)開展此方面的研究提供參考依據(jù)。

1口腔衰弱與肌少癥的關(guān)系

口腔衰弱會(huì)增加老年人肌少癥的發(fā)生風(fēng)險(xiǎn),有口腔衰弱的老年人肌少癥患病率是無口腔衰弱老年人的2.2倍[2]??谇凰ト跤绊懯澄锏木捉琅c吞咽,導(dǎo)致老年人進(jìn)食速度減慢,進(jìn)餐時(shí)間延長(zhǎng),食物攝入減少以及能量消耗增加。能量攝入不足可導(dǎo)致肌肉纖維中的線粒體能量代謝異常,導(dǎo)致肌肉疲勞、功能降低以及肌肉萎縮,肌少癥患病風(fēng)險(xiǎn)增高。而肌少癥則會(huì)對(duì)老年人的口腔功能造成負(fù)面影響,如唇部力量下降,唇肌閉合不良,吞咽肌肉萎縮,吞咽肌肉質(zhì)量和功能下降等,導(dǎo)致口腔衰弱發(fā)生,進(jìn)而發(fā)生食物滲漏、誤吸、吸入性肺炎甚至窒息死亡,嚴(yán)重威脅老年人的健康[2]??梢?,老年人口腔衰弱與肌少癥密切相關(guān)。

1.1牙齒脫落與肌少癥

牙齒脫落是以多顆牙齒缺失為特征的病理狀態(tài),是口腔衰弱的常見表現(xiàn),發(fā)達(dá)國(guó)家老年人牙齒脫落高達(dá)35%,有67%的老人佩戴義齒[3]。佩戴義齒的老年肌少癥患病率為25.7%,而義齒不合適者與無牙的義齒者咀嚼功能更差,更容易導(dǎo)致營(yíng)養(yǎng)攝入不足,肌肉力量下降,從而使肌少癥患病風(fēng)險(xiǎn)增高[4]。還有研究提示,老年人牙齒脫落與步行速度下降有關(guān)[5]。而步行速度下降會(huì)導(dǎo)致線粒體功能障礙和氧化應(yīng)激反應(yīng)上升,加速骨骼肌分解代謝速率,促使骨骼肌丟失,增加肌少癥患病風(fēng)險(xiǎn)[6]。由此可見,牙齒脫落是肌少癥的重要危險(xiǎn)因素。

1.2舌壓降低與肌少癥

低舌壓是口腔衰弱重要的評(píng)估指標(biāo),舌肌在吞咽過程中起重要作用,不僅將食物從口腔推動(dòng)至咽喉,同時(shí)還參與氣道保護(hù),防止誤吸[7]。低舌壓會(huì)阻礙食物的咀嚼與吞咽,延長(zhǎng)進(jìn)餐時(shí)間,導(dǎo)致食物攝入減少,進(jìn)而增加營(yíng)養(yǎng)不良與肌少癥的發(fā)生風(fēng)險(xiǎn)。一項(xiàng)橫斷面研究結(jié)果提示,269例老年人肌少癥患病率為11.2%,且與低舌壓顯著相關(guān)[8]??谇患∪鉁p少會(huì)使舌壓降低、口唇力量與舌頭力量減弱,在146例老年肌少性吞咽困難患者中,因低舌壓導(dǎo)致的吞咽困難者占58.6%,因此,低舌壓可作為預(yù)測(cè)肌少性吞咽困難發(fā)生的指標(biāo)[9-10]。

1.3咀嚼功能下降與肌少癥

對(duì)2 259例老年人進(jìn)行咀嚼功能測(cè)試,結(jié)果發(fā)現(xiàn)37.8%的人群存在咀嚼功能下降,且與肌少癥密切相關(guān)[11]。咀嚼功能下降影響蛋白質(zhì)、維生素及礦物質(zhì)等營(yíng)養(yǎng)元素?cái)z入,其中蛋白質(zhì)是肌肉代謝的關(guān)鍵成分,蛋白質(zhì)攝入不足,肌肉蛋白合成降低,肌肉丟失明顯,肌少癥發(fā)生風(fēng)險(xiǎn)增加。咀嚼功能下降會(huì)導(dǎo)致老年人握力降低[12]。而握力是肌肉力量評(píng)估的重要標(biāo)準(zhǔn),是肌肉功能減退的表現(xiàn)形式。故咀嚼功能下降與肌少癥的發(fā)生相關(guān)。

1.4吞咽困難與肌少癥

肌少癥可導(dǎo)致老年人吞咽肌肉功能下降,容易出現(xiàn)肌少性吞咽困難。卒中相關(guān)性肌少癥的患病率為53.5%[13]。這是因?yàn)樽渲欣夏耆擞捎谥袠猩窠?jīng)系統(tǒng)受損,可出現(xiàn)吞咽困難及肢體活動(dòng)障礙等嚴(yán)重并發(fā)癥,從而導(dǎo)致營(yíng)養(yǎng)不良及肌肉力量下降,加速肌少癥的進(jìn)程。患肌少癥的老年人吞咽困難發(fā)生風(fēng)險(xiǎn)是未患肌少癥老年人的2.7倍[14]。多種病因所致的吞咽困難使得老年人進(jìn)食意愿降低,容易造成營(yíng)養(yǎng)不良及吸入性肺炎,而營(yíng)養(yǎng)不良可激活肌肉蛋白水解途徑,導(dǎo)致肌肉萎縮;吸入性肺炎可致機(jī)體慢性炎癥反應(yīng),誘發(fā)肌肉萎縮,導(dǎo)致其殘疾甚至死亡[15]。

1.5口腔運(yùn)動(dòng)功能減退與肌少癥

口腔運(yùn)動(dòng)功能隨著年齡增長(zhǎng)而減退,是口腔衰弱的主要評(píng)估指標(biāo),多見于口腔癌患者,這是因?yàn)榭谇话┗颊咄ǔ?huì)經(jīng)歷手術(shù)、放療或者化療,其并發(fā)癥不僅會(huì)損傷唾液腺功能,導(dǎo)致永久性口干,還可誘發(fā)口腔黏膜炎、口腔疼痛及味覺改變等,致使口腔運(yùn)動(dòng)功能減退,影響食物咀嚼與吞咽,進(jìn)而導(dǎo)致營(yíng)養(yǎng)攝入不足及肌肉力量減輕,增加口腔衰弱與肌少癥的患病風(fēng)險(xiǎn)[16-17]。

2口腔衰弱與肌少癥的共病因素

2.1多重用藥

老年人常常多病共存,多重用藥。多重用藥的老年肌少癥患病率是服用少量藥物老年人的2倍[18]。同時(shí)服用多種藥物(尤其是他汀類、糖皮質(zhì)激素、抗抑郁、抗高血壓以及抗精神病類藥物),可因藥物不良反應(yīng)出現(xiàn)唾液腺分泌不足、口腔炎癥反應(yīng)以及肌肉毒性,還可造成線粒體功能障礙、細(xì)胞凋亡與蛋白質(zhì)分解等。使老年人出現(xiàn)咀嚼與吞咽困難、腸道吸收功能減弱、步行速度下降以及肌肉質(zhì)量與力量降低,增加口腔衰弱與肌少癥的易感性[18-19]。多重用藥導(dǎo)致的口腔異味,還可造成老年人社交孤立,使其產(chǎn)生強(qiáng)烈的病恥感,嚴(yán)重影響其身心健康。

2.2營(yíng)養(yǎng)不良

營(yíng)養(yǎng)是維持身體健康的重要保障。營(yíng)養(yǎng)不良的老年人肌少癥患病率是正常老年人的4倍[20],尤其是無牙老年人營(yíng)養(yǎng)不良發(fā)生風(fēng)險(xiǎn)可增加21%。缺牙或無牙會(huì)影響老年人的咀嚼功能,導(dǎo)致其營(yíng)養(yǎng)攝入不足,機(jī)體能量缺乏,不得不分解自身的骨骼肌作為氨基酸的來源,從而增加肌少癥患病風(fēng)險(xiǎn)。營(yíng)養(yǎng)不良還可導(dǎo)致微量營(yíng)養(yǎng)元素缺乏,導(dǎo)致氧化應(yīng)激反應(yīng),從而引發(fā)全身機(jī)體慢性炎癥反應(yīng),誘發(fā)牙周炎,而牙周炎是導(dǎo)致肌少癥發(fā)生及發(fā)展的重要影響因素[19]。

2.3炎癥反應(yīng)

牙周炎是老年人常見的慢性炎癥性疾病,患病率高達(dá)70%。牙周炎患者的牙齦組織中可檢測(cè)出高水平的白細(xì)胞介素6(Interleukin,IL-6)和腫瘤壞死因子α(Tumor necrosis factor-α,TNF-α),血清中的C-反應(yīng)蛋白(C-reactive protein,CRP)與瘦蛋白也偏高[21]。這些炎癥因子與骨骼肌分解代謝路徑、自噬溶酶體系統(tǒng)、泛素蛋白酶體系統(tǒng)以及細(xì)胞凋亡的激活有關(guān),導(dǎo)致蛋白質(zhì)合成與分解失衡,肌肉力量與質(zhì)量降低,增加肌少癥發(fā)生風(fēng)險(xiǎn);而肌少癥可通過血清中的IL-6、TNF-α和CRP導(dǎo)致老年人全身慢性炎癥反應(yīng)[22]。誘發(fā)牙周炎,導(dǎo)致口腔衰弱。牙周炎與維生素D、鈣劑、糖尿病和冠心病密切相關(guān),維生素D與鈣劑攝入不足會(huì)造成老年人肌肉萎縮和肌力減弱[19]。糖尿病老年人牙周炎患病風(fēng)險(xiǎn)是非糖尿病老年人的3倍[23]??赡芘c慢性炎癥因子相關(guān),而炎癥因子水平升高與肌肉力量與質(zhì)量呈負(fù)相關(guān)[24]。牙周炎也促使冠心病的發(fā)病風(fēng)險(xiǎn)增高,而冠心病是肌少癥的危險(xiǎn)因素之一。

2.4心理因素

口腔衰弱會(huì)給老年人身心帶來嚴(yán)重困擾。齲齒、牙周炎及黏膜病變產(chǎn)生的疼痛不僅降低其對(duì)食物的攝入,還影響睡眠質(zhì)量,從而導(dǎo)致疲勞感加重、記憶力減退以及免疫功能低下等,增加抑郁癥、糖尿病以及心血管疾病等患病風(fēng)險(xiǎn)[25-27]。而罹患多種疾病可增加機(jī)體慢性炎癥反應(yīng),加速牙齒脫落,導(dǎo)致運(yùn)動(dòng)功能下降、肌肉質(zhì)量和肌肉力量衰退,增加肌少癥患病率,進(jìn)一步加速身體衰弱[28-29]。多顆牙齒脫落或者無牙不僅影響老年人面部美觀,還導(dǎo)致口腔運(yùn)動(dòng)功能減退,影響正常交流,使其缺乏自信,加重焦慮、抑郁等不良情緒,進(jìn)而減少日?;顒?dòng),加速肌少癥發(fā)生風(fēng)險(xiǎn)。

3展望

隨著全球人口老齡化進(jìn)程加劇,老年人口腔衰弱與肌少癥的發(fā)生風(fēng)險(xiǎn)增高??谇凰ト跬ㄟ^不同途徑對(duì)肌少癥的發(fā)生、發(fā)展以及預(yù)后產(chǎn)生影響,而肌少癥亦可能會(huì)加速口腔衰弱的進(jìn)展??谇凰ト跖c肌少癥的相關(guān)性研究結(jié)果較少,且不一致,未來仍需進(jìn)行大量的前瞻性研究揭示兩者的因果關(guān)系。

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(2022-08-05收稿)

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