\n\n
在正常情况下,肠道内的菌群结构相对稳定,对宿主表现为不致病。
\n\n肠道微生物调节剂是一类能够调节肠道微生态失衡,保持微生态平衡,提高人体健康水平的制剂。简单说就是能提高肠道有益菌比例,减少致病菌的比例。
\n\n肠道微生物调节剂包括生理性活菌、生理性活菌的代谢产物以及能促进生理菌群生长繁殖的制剂。主要有益生菌、益生元和合生元三类。
\n\n不是,药用益生菌为肠道微生物调节剂的一种。益生菌是对人体起有益作用的活的微生物制剂,通常包括双歧杆菌属、乳杆菌属、肠球菌属和酵母菌属等。
\n\n益生元则是一类非消化性物质,能够促进益生菌的生长和活性,抑制有害细菌生长,如低聚果糖、菊粉等。
\n\n合生元(合生素)则是一类将益生菌和益生元组合制成的产品。
\n\n简单地说,当肠道菌群失调时,临床上会使用肠道微生物调节剂来调节和恢复肠道微生态的平衡。肠道菌群失调是指肠道正常菌群的种类、数量和比例发生异常变化。
\n\n《中国消化道微生态调节剂临床应用共识(2016 版)》推荐将其用于以下人群:幽门螺杆菌相关性胃炎、非酒精性脂肪性肝病和代谢性疾病、肝硬化、肝衰竭肝移植、抗生素相关腹泻、肠易激综合征、炎症性肠病、结直肠癌等。
\n\n国家卫生健康委员会 2020 年 1 月 27 日发布的《新型冠状病毒感染的肺炎诊疗方案(试行第四版)》以及 2 月 5 日发布的第五版诊疗方案中,均提及肠道微生态调节剂参与新型冠状病毒治疗方案相关内容。
\n\n诊疗方案里提到,对于重型、危重型病例的治疗,“可使用肠道微生态调节剂,维持肠道微生态平衡,预防继发细菌感染”,这是因为危重症患者处于急性应激状态,易发生应激性溃疡,另外临床上抗生素的使用进一步增加肠道菌群紊乱风险,损伤人体最大的免疫器官——肠道黏膜免疫屏障,易引起继发性细菌感染。
\n\n肠道菌群对黏膜免疫的影响不仅仅局限在胃肠道,对肠道以外的远端黏膜部位的免疫反应也会产生影响,包括肺。
\n\n患者的肠道微生态一旦紊乱,不仅会使免疫力降低,甚至继发新的感染,加重病情。
\n\n因此,在新冠肺炎的治疗中,为维持肠道微生态平衡,预防继发细菌感染,积极应用微生态疗法有助患者早日恢复。
\n\n肠道微生物调节剂的作用在于调节和纠正肠道微生态的平衡,对于正常人来说,肠道的功能和肠道微生态都是正常的,只要按照《中国居民膳食指南》的原则,合理饮食,没有必要特意服用肠道微生物调节剂。
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