文献解读N乙酰半胱氨酸在降低慢性支

N-乙酰半胱氨酸在降低慢性支气管炎和COPD急性加重率中的作用—Meta分析

CazzolaM等,Europeanrespiratoryreview,

摘要

为了验证N-乙酰半胱氨酸(NAC)在降低慢性支气管炎和COPD急性加重率中的作用,我们进行了一个Meta分析来获取证据,并分析使用低剂量(≤mg/日)和高剂量(>mg/日)NAC之间是否存在差异。此次分析纳入了13项研究,共个COPD患者,其中NAC组人,安慰剂组人。Meta分析显示NAC组的慢性支气管炎和COPD患者的急性加重率低于对照组(相对危险度0.75,95%置信区间0.66-0.84,p0.01),并且有气道梗阻证据的病人急性加重率降低更明显。高剂量NAC在肺活量标准诊断COPD的患者中也同样有效(相对危险度0.75,95%置信区间0.68-0.82,p=0.04)。NAC的耐受性良好,并且出现药物副作用的风险与用药剂量无关(低剂量相对危险度0.,93,95%置信区间0.89-0.97,p=0.4;高剂量相对危险度1.11,95%置信区间0.89-1.39,p=0.58)。此次Meta分析的结果显示伴有气道阻塞的慢性支气管炎患者需服用≥mg/日的NAC以预防急性加重,单纯慢性支气管炎患者使用mg/日的常规剂量就可以有效减少急性加重频率。

InfluenceofN-acetylcysteineonchronicbronchitisorCOPDexacerbations:ameta-analysis

CazzolaMetc.

Abstract

InordertoclarifythepossibleroleofN-acetylcysteine(NAC)inthetreatmentofpatientswithchronicbronchitisandchronicobstructivepulmonarydisease(COPD),wehavecarriedoutameta-analysistestingtheavailableevidencethatNACtreatmentmaybeeffectiveinpreventingexacerbationsofchronicbronchitisorCOPDandevaluatingwhetherthereisasubstantialdifferencebetweentheresponsesinducedbylow(≤mgperday)andhigh(mgperday)dosesofNAC.Theresultsofthepresentmeta-analysis(13studies,COPDpatients,NACn=;placeboorcontrolsn=)showedthatpatientstreatedwithNAChadsignificantlyandconsistentlyfewerexacerbationsofchronicbronchitisorCOPD(relativerisk0.75,95%CI0.66-0.84;p0.01),althoughthisprotectiveeffectwasmoreapparentinpatientswithoutevidenceofairwayobstruction.However,highdosesofNACwerealsoeffectiveinpatientssufferingfromCOPDdiagnosedusingspirometriccriteria(relativerisk0.75,95%CI0.68-0.82;p=0.04).NACwaswelltoleratedandtheriskofadversereactionswasnotdose-dependent(lowdosesrelativerisk0.93,95%CI0.89-0.97;p=0.40;highdosesrelativerisk1.11,95%CI0.89-1.39;p=0.58).Thestrongsignalthat


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