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SICU-1LowCardiacOutputSyndrome低心排综合征LowCardiacOutputSyndrome低心排综合征(LowCardiacOutputSyndrome，LCOS)，简称低心排，是心脏外科最严重的生理异常，正常人的心排出量按每平方米面积计算，也就是心指数为3-4L/(min·m2)，如心指数降低至3L/(min·m2)以下而有周围血管收缩，组织灌注不足的现象，称为低心排出量综合征。1contents524observingandnursingcareTreatmentsclinicalmanifestationsCasesintroduction3causesofLCOSCasesintroductionName:ZhuChangyinGender:MaleAge:59Admissiontime:2017-08-06Operationtime:2017-08-17Maincomplaint:chesttightness,wheezefor4months姓名：祝长银性别：男年龄：59岁入院时间：2017-08-06手术时间：2017-08-17主诉：胸闷、憋喘4月余CasesintroductionDiagnosis:heartvalvestenosis,tricuspidregurgitationOperation:aorticvalvereplacement诊断：主动脉瓣狭窄三尖瓣返流手术名称：主动脉瓣置换术Historyofpresentillness现病史chesttightness胸闷,suppressasthma憋喘,cough咳嗽,sputum咳痰,withoutsignificantfactorsinAprilthisyeardiagnosis:pleuraleffusion,Afworse,nightorthopnea夜间端坐呼吸,cannotlaydown.diagnosedwithheartvalvedisease.admittedtotheclinicwith"valvulardisease".pasthistory既往史Diabetes（糖尿病）historyfor2years.Paroxysmalatrialfibrillation（阵发性房颤）for4months.Postoperativelowcardiacperformance术后低心排表现theoxygensaturationreducedfrom98to88.CVP11-12，slowlyroseto21-22Bloodpressureisdownfrom130-140/80to110/70nourineatthesametimeHeartcolorultrasoundrevealed:noeffusionofpericardialfluid,asmallamountoffluidintherightsideofthethoraciccavity,theleftventricularwallmovinglower,EF38causesofLCOS低心排的原因(1)Pulmonaryhypertension肺动脉高压cardiacinsufficiency心功能差Arhythmia心律失常unsuccessfulcorrectionofcardiacmalformation心脏畸形矫正不良causesofLCOS低心排的原因(2)Coronaryaeroembolism---cardialinfarction冠脉气栓—心梗Hypovolemia血容量不足cardiaccontractiledysfunction心肌收缩不全pericardialtamponade心包填塞patho-physiologicchange病理生理变化主动脉阻断复灌无氧代谢增加能量生成减少乳酸增多Na泵功能障碍细胞酸中毒心肌水肿，内膜下出血clinicalmanifestations临床表现Mindchange神志变化palecomplexion,Coldlimbs面色苍白、四肢湿冷tachycardia心动过速Fastandshallowbreathing呼吸浅快Monitoringindicators监护指标BPEarlybloodpressuredoesnotnecessarilydecrease,andoncelowbloodpressureisshown,theconditionissevereCVPDifferentialdiagnosisforpatientswithlowcardiacsyndromeABG血气分析PaO2decreased,standardbicarbonateandPHdecreasedUrineVolume尿量themostsensitiveindicationTreatments治疗(1)保证前负荷的情况下若血压低，可选用增强心肌收缩力的药物。Dopamine:5-10g/kg/minμ>10μg/kg/min收缩肾脏血管Epinephrine：正性肌力，收缩全身血管，关注尿Noradrenaline：增加外周阻力Treatments治疗(2)Arythmia心律失常SVT(室上速)：西地兰：正性肌力减慢心率注意钾与钙Af(房颤)：可达龙：常见心动过缓Bradycardia(心动过缓)：异丙肾上腺素临时起搏器Treatments治疗(3)机械通气治疗低氧血症必须在补足血容量、增强心肌收缩力和降低外周血管阻力的基础上进行。应用镇静剂，应用呼吸机辅助呼吸改善氧交换可减少心脏做功20%，待低心排纠正方可撤离呼吸机。该病人术后低心排的治疗措施：1、多巴胺3-6μg/kg/min，肾上腺素0.006μg/kg/min。2、鼻加面双吸氧，SpO292-94%.血气:氧分压41-48，给予气管插管。接呼吸机辅助呼吸。3、病人插管之后，不配合，异丙酚20ml/h，艾贝宁7ml/h,效果不佳，静推吗啡一支。病人生命体征逐渐平稳，艾贝宁减到了5ml/h，异丙酚10ml/h.氧分压升到76。4、病人尿量少，速尿40mg静推效果不好，改成速尿200mg静推泵入2ml/h，尿量80-100ml/h，速尿逐渐减停...