L浆BNP水平在老年COPD患者呼吸机脱机中评估中图分类号:R562;R563.8文献标识码:A文章编号:1009_816X(2011)04_0267—03D0I:10.3969/j.issn.1009_816X.2011.04.06TheEvaluationofBrainNatriureticpeptideduringWeaninginElderlyPatientswithChronicObstructivePulmonaryDisease.XUQiang_hong,YANJing,GONGShi_jin,etal.DepartmentofIntensiveCareUnit,ZhejiangHospital,Zhejiang310012,China[Abstract]ObjectiveToevaluatetheutilityofserialmeasuremeritsofplasmabrainnatriureticpeptide(BNP)bydetectingacutecardiacdysfunctionduringweaningfailureforelderlypatientswithchronicobstructivepulmonarydiseaseindifficulttowean.Methods60elderlypatientswithchronicobstructivepulmonarydiseaseweredividedintotwogroups:BNPapplicationgroup(30cases)andstandardtherapygroup(30cases).Cardiacandhemodynamicvariables,arterialbioodgas,respiratorymechanicsandindexesofoxygencostofbreathing,weremeasuredandanalyzedimmediatelybefore(baseline)andattheendofaspontaneousbreathingtrial.PlasmalevelsofBNPandeachmeasurementofBNPaftereveryhourwasmeasuredinapplicationBNPgroup.BNPwasmeasuredinApplicationBNPgroupandaccordingtoBNPvalue,patientsweredividedintotwogroups:normalgroupandincreasedgroup;Beforeandafterweaning,LVEFwasmeasuredbyechocardiographys.ResultsComparedwithstandardtherapygroup,HRSBPDBPSa02RRPa02/Fi02PH,PaC02,Pa02ofthepatientswithincreasedBNPvalueinBNPapplicationgroup,increasedsignificantlyafterSBT(P<0.05);Comparedwithnormalgroup,HRSBPDBPSa02RRPa02/Fi02PH,PaC02,Pa02ofthepatientswithincreasedBNPvalueinBNPapplicationgroupincreasedsignificantly(P<0.05).InBNPapplicationgroup,patientswhoweanedsuccessfullyweremorethanthestandardtherapygroup.ConclusionsSerialmeasurementsofBNPplasmalevelsprovideanoninvasivemannertodetectacutecardiacdysfunctionduringanunsuccessfulweaningtrialfortheelderlypatientsindifficulttoweanwithchronicobstructivepulmonarydiseaseindifficulttowean.TheuseofBNPcanimprovethesuccessrateofweaningoutcome.[Keywords]BNP;ChronicObstructivePulmonaryDisease;Weaning;theElderly接受机械通气的慢性阻塞性肺病(COPD)急性加重患者常常存在脱机困难[1]。呼吸力学加重和所产生的呼吸肌疲劳、肺动脉嵌压升高、急性左心室缺血、左心室射血分数下降和右心室扩大伴随室间隔左移位[2]是脱机失败的主要原因。coro患者常出现呼气流速受限导致的肺动态充气过度,提示存在内在呼气末正压(PEEPi)o因此,自主呼吸的重建可增加心血管负荷,同时COPD本身是心血管疾病发病和死亡强有力的独立危险因素[3],表明隐匿性心功能不全在COPD患者中较为常见。测量血浆脑钠肽(BNP)水平可为急性心力衰竭导致的呼吸困难和其它因素导致的呼吸困难之间的鉴别诊断提供重要依据。此外,在充血性心力衰竭、左心室舒张功能不全和冠心病患者中,血浆脑钠肽水平高于正常值[4]。有研究评估血浆脑钠肽(BNP)在脱机困难的COPD患者中,BNP水平升高可靠反映脱机试验中出现的急性心功能不全,本文应用血浆BNP水平指导脱机过程,及时发现心功能异常,及时终止脱机,及时处理相关问题,最终迗到提高COPD患者脱机成功率。1资料和方法1.1一般资料:本院自2007年2月至2009年9月共收治以需要接受有创机械通气,并且脱机困难的急性老年COPD加重患者60例。C0PD加重定义为存在C0PD病史的患者中呼吸道症状急性加重,可根据《慢性阻塞性肺疾病急性加重患者的机械通气指南》诊断[5]。如果患者满足脱离机械通气的标准,但连续3次自主呼吸尝试(SBT)失败,则被视为脱机困难。存在充血性心力衰竭病史或ICU病房住院期间的任何时间内诊断为充血性心力衰竭、近期出现不稳定性冠脉综合征(6个月前出现急性心肌梗死、不稳定性或重度心绞痛)、重度心瓣膜病、重度心律失常或肺栓塞患者不得入选研究。其它排除标...