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1、亚低温技术在心肺复苏中的应用Therapeutic hypothermia in post-resuscitation patients,提纲,心跳骤停的流行病学及其预后亚低温疗法和其作用机制亚低温治疗心跳骤停病人的循证学依据哪一种亚低温疗法最有效?教育、实施和科研方面的挑战,猝死病人死亡率近70%,心脏骤停的流行病学,400,000 骤停/每年在 U.S.A医院,3/4 门急诊,1/4 住院患者,出院时的存活率,1-5%10-20%,只有 2%的幸存患者神经性功能良好,Mry Ann Peberdy,Joseph P Ornato,High quality post resuscitatio
2、n care,Survival rates among those admitted vary from 0 60%!,低温治疗的分类,低温治疗作用机制,传统认为：低温主要通过降低葡萄糖和氧耗延缓代谢而起到保护作用,低温治疗作用机制的新观念,抗凋亡、Ca2+介导的蛋白水解作用和线粒体损伤稳定离子泵和抑制神经兴奋性级联反应抑制免疫和炎症反应抗自由基损伤降低血管渗透性和减轻脑水肿减轻细胞膜渗透性改变和细胞内酸中毒抑制脑内局部温度升高后的脑损害降低脑代谢,Bladder Temperature in the Normothermia and Hypothermia Groups.The T bars
3、 indicate the 75th percentile in the normothermia group and the 25th percentile in the hypothermia group.The target temperature in the hypothermia group was 32 to 34,and the duration of cooling was 24 hours.Only patients with recorded temperatures were included in the analysis.,Cooling End,After 6 m
4、onths:Rate of death(41%)in the hypothermia is 14%lower than in the normothermia group(39%).,欧洲多中心临床试验（HACA trial),随机将275名患者分组为低温或常温两组 降温时间：使用体表降温降到34度耗时6.5个小时结果：低体温 正常体温好的结果 55%39%p=0.009死亡率 41%55%p=0.02,每六个接受治疗的患者，有一个可救活！,Number needed to treat to achieve good neurological outcome in one extra pati
5、ent:,6,Holzer M et al.,Crit Care Med 2005;33:414-8.,澳大利亚的研究,77名患者的随机临床试验使用冰袋冷却0.9度/小时 结果:低体温 正常体温好结果 49%26%p=0.046死亡率51%68%P=NS,Preliminary evidence in patients with asystole/PEA,Polderman KH et al.Induced hypothermia improves neurological outcomein asystolic patients with out-of hospital cardiac ar
6、rest.Circulation 2003;108:IV-581 abstract 2646,欧洲HART Study-ICY 在心脏骤停的多中心试验,心搏停跳后，ICY 导管亚低温治疗。前瞻性的，多中心研究对心搏停搏患者使用ICY导管进行可行性和安全性评估多中心参加:Henry Ford,Duke,University of Houston欧洲复苏理事会资助 30 多个中心参加，包括500名患者，结果在2005年9月阿姆斯特丹会议上公布。欧洲HACA 调查者将使用CoolGard 3000和Icy 导管作为金标准降温疗法。,Before-and after comparison in 665
7、 out-of hospital cardiac arrest in the Stavanger area(population 300 000)2001-2003,Before-and after comparison in 665 out-of hospital cardiac arrest in the Stavanger area(population 300 000)2001-2003,Cooling Procedure,introduce the cooling device(Icy and CoolGard 3000;Alsius Corp),foley-catheter,24
8、h,target temperature at 33,rewarmed,0.5/h,3637,Icy-catheter,Start up Kit,All patients in the database from August 1991 to November 2004 were screened.For outcome evaluation all patients who were cooled with endovascular cooling during this period were evaluated.For evaluation of cooling rate we rest
9、ricted the analysis to patients who received endovascular cooling exclusively.,Bladder temperature course.Median,25th and 75th quartile of bladder temperature after return of spontaneous circulation in patients,who were exclusively cooled with the endovascular cooling device(n=56).Target temperature
10、,33C;cooling duration,24 hours.,95 min 35.31.0,253 min 33,24 hr,388 min36,1.2/hour,Adverse Event,Endovascular Cooling(n=62),Control(n=104),P,Complications During and After Endovascular Cooling Compared to Frequency-Matched Controls,Methods-Consecutive comatose survivors of cardiac arrest,who were ei
11、ther cooled for 24 hours to 33C with endovascular cooling or treated with standard postresuscitation therapy,were analyzed.Complication data were obtained by retrospective chart review.Results-Patients in the endovascular cooling group had 2-fold increased odds of survival(67/97 patients vs 466/941
12、patients;odds ratio 2.28,95%CI,1.45 to 3.57;P0.001).After adjustment for baseline imbalances the odds ratio was 1.96(95%CI,1.19 to 3.23;P=0.008).In the endovascular cooling group,51/97 patients(53%)survived with favorable neurology as compared with 320/941(34%)in the control group(odds ratio 2.15,95
13、%CI,1.38 to 3.35;P=0.0003;adjusted odds ratio 2.56,1.57 to 4.17).There was no difference in the rate of complications except for bradycardia.Conclusion-Endovascular cooling improved survival and short-term neurological recovery compared with standard treatment in comatose adult survivors of cardiac
14、arrest.Temperature control was effective and safe with this device.,An advisory statement by the Advanced Life Support Task Force of the International Liaison Committee on Resuscitation(ILCOR includes AHA)(Published in Resuscitation,June 2003 and Circulation,July 2003),对于无知觉的具有自发循环的门急诊心脏骤停患者，如果出现最初室
15、颤节律，则应该将该患者体温降到 32-34度达12-24小时。像这样的降温也对其它的节律性疾病或住院的心脏骤停患者有益。,ILCOR Recommendations,International Emergency Cardiac Care Guidelines（2005）,mild hypothermia may be beneficial to neurologic outcome and is likely to be well tolerated without significant risk of complications.In a select subset of patient
16、s who were initially comatose but hemodynamically stable after a witnessed VF arrest of presumed cardiac etiology,active induction of hypothermia was beneficial.Thus,unconscious adult patients with ROSC after out-of-hospital cardiac arrest should be cooled to 32 to 34 for 12 to 24 hours when the ini
17、tial rhythm was VF(Class IIa).Similar therapy may be beneficial for patients with non-VF arrest out of hospital or for in-hospital arrest(Class IIb).,Probably as quickly as possible,Cardiac Arrest,ROSC,0 1 2 3 4 5 6 7 8,Time,Intra-arrest Abella,2004Katz,2000,Soon after ROSCSterz,1991Kuboyama,1993,HA
18、CA,2002,When to start cooling?,Bernard,2002,Prehospital and ED cooling?YES!,体表降温冰袋,冰袋，通常把它放在患者腹股沟，位于身体体表的位置，腋窝下和头周围。护士要不断地清理由于冰袋融化而出来的冷凝水和不断地挪动冰袋的位置以防温度太低造成的局部组织损伤,Bernard et al,Rescuscitation 2003;56:9-13;Virkkunen et al.,Resuscitation 2004;62:299-302;Rijnsburger Intensive Care Med 2004 30:Suppl 1
19、abstr 475;Polderman et al.Critical Care Med 2005;33:2744-51.,Cold fluid infusion?,Three studiesPost-ROSC patientsRefrigerated Ringers lactate(40C),saline or colloids to induce hypothermiaAverage volume 1500-3000 ml within 30-60 minHemodynamic improvement and no lung problemsSafe and effective(30-60
20、min to reach target temp),体表降温kcl床,kcl床，这种床用于欧洲的HACA(心脏停搏后的低温治疗）实验，将病人放置到带有拉链的袋子中，然后吹入冷气包围患者身体，可以想象患者被包围住的护理有多困难。,Invasive or non-invasive cooling technique?,New knowledge,new methods and new equipment!,亚低温治疗程序：治疗的3个不同阶段,严格控制在32-34度,缓慢，可控的复温以免颅内压反弹,必须能够完全控制3个阶段,Temperature Profile Using Icy Catheter
21、(Cooling time:98 minutes）,与目标温度一致,快速降温,缓慢，可控复温阶段,HACA 试验 vs ALSIUS Icy,21(51),18(65),75(55),54(39),Good,18(44),23(56),All rhythmsn=41,Icy,8(29),20(71),VF onlyn=28,Icy,56(41),76(55),Dead,81(59),62(45),Alive,Hypothermia(低体温）,Control,HACA Trialn(%),.28,.02,结果趋向于使用血管内冷却方法更有效。,6 个月的结果,体表降温和血管腔内降温,体表降温护理工
22、作强度大(ice packs/lavage bladder,ngt/cooling blanket)很难维持目标温度-降温过度 不可控制复温 ICP(颅压）反弹和体温过高增加寒战过度的护理操作（冰垫/降温毯）对病情不稳定的患者有不良影响血管腔内降温开始治疗容易（中心静脉入路）不影响患者的护理工作与体表降温相比减少寒战次数容易快速与患者分离有效地控制降温后的患者体温反弹，ICU 患者最多可以使用4天,血管内降温,冰毯,结果：与表面降温组相比，血管内降温组：降温迅速在温度维持阶段，温度波动小(0.1)复温更加迅速,European ICU survey:therapeutic hypothermi
23、a use(Boerriger et al,2006),Around 60%reported use of therapeutic hypothermia65%cooled all comatose survivors10%only witnessed arrest10%only VF/VTReasons given for not using TH:lack of science(5%)and fear of side-effects(2%)lack of consensus(10%)lack of equipment(25%),A”COOL”SUCCESS STORY:rapid impl
24、ementation of therapeutic hypothermia in Norway,All patients with ROSC after cardiac arrest who are not following verbal commands!Only witnessed arrestOnly VF/VT and age 18-75(HACA/Bernard study inclusion criteria)out-of-hospital ventricular fibrillation Asystole pulseless electrical activity（PEA）,P
25、atient selection,When should mild hypothermia be started?How rapidly should the cooling take place?How long to cool?12 hours or 24 hours(NEJM 2002;346:549556 vs.346:557563)?Target temperature?33 degrees or 35 degrees Celsius?How rapidly should warming take place?Is therapeutic hypothermia efficaciou
26、s for patients with initial rhythms other than ventricular fibrillation?Can we differentiate those patients who will benefit from mild hypothermia and those who will not?,Still a lot of questions,Prognostic indicators,In a meta-analysis of 11 studies involving almost 2000 patients in cardiac arrest,
27、there were no immediate clinical signs to predict neurologic outcome.The best clinical signs:absent corneal reflexes at 24 h;absent pupillary response at 24 h;no motor response at 24 h;and no motor response at 72 h.The estimate of poor outcome for comatose patients following arrest was 77%which increased to 97%with negative clinical indicators at 2472 h.An electroencephalogram after 2448 h of care may also be a useful prognostic guide.,
