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1、ICU中的血液净化指南之我见,Contents,Introduction,1,Type of therapy,2,Timing of CRRT,3,Dose of CRRT,4,Conclusions,5,6,Introduction,Methods of extracorporeal renal replacement therapy(RRT)have been used for the supportive treatment of AKI for over 60 years.CRRT for the critically ill patient with ARF was introduc
2、ed in 1977 by Kramer et al.Since then,many studies have reported on CRRT in the critically ill.,Klin Wochenschr 1977;55:1121-1122.,Introduction,But for several reasons comparison among studies is difficult:Various treatment modalities have been applied in heterogeneous populations.Differences in cli
3、nical setting and underlying molecular biological mechanisms that initiate and maintain ARF.Furthermore,more than 35 definitions of ARF.Practice patterns vary widely between individual centers.Up to now,there are no standard guidelines for the application of CRRT in critically ill patients.,Curr Opi
4、n Crit Care 2002;8:509-514.,Introduction,The RIFLE Classification for acute renal failure,Crit Care 2004;8:R204-R212.,Introduction,Conclusions:More then 200 different definitions of ARF and about 90 RRT start criteria were reported.Oliguria and RIFLE were the most frequent criteria used to define AR
5、F.RIFLE criteria might show a clinical impact on future daily practice and research.Different RRT techniques are available in most centers,but a general lack of treatment dose standardization is noted by our survey.Non-renal indications to RRT still need to find a definitive role in routine practice
6、.,Nephrol Dial Transplant(2006)21:690696,In the past,the interaction between nephrology and intensive care was minimal.Today,there is continuous interaction with several moments of high interaction due to common patients and complex syndromes,and much of the treatment of AKI has moved from the renal
7、 ward into ICUs.,Introduction,Contrib Nephrol.Basel,Karger,2010(166):13,Contents,Introduction,1,Type of therapy,2,Timing of CRRT,3,Dose or intensity of CRRT,4,Conclusions,5,6,Type of therapy,Classification of blood purification in critical care(BPCC)technology,PMX=polymyxin-B immobilized fiber;PMMA=
8、polymethylmethacrylate;PAN=polyacrylonitrile;PEPA=polyether polymer alloy,Contrib Nephrol.Basel,Karger,2010(166):1120,Type of therapy,As a continuous therapy,CRRT can be rapidly tailored to changes in a patients clinical condition during critical illness,Blood purification in critical care,Contrib N
9、ephrol.Basel,Karger,2010(166):1120,HDF=hemodiafiltration,Type of therapy,These advantages have contributed to the widespread uptake of CRRT as the first-choice RRT in ICUs throughout Australia,Japan and Europe.In these regions,CRRT is usually initiated and managed within the ICU,with RRT being integ
10、rated with other aspects of the management of critical illness,Nat.Rev.Nephrol.2010:6:521529.,Type of therapy,In north America,however,traditional structures of ICU management favor an open-ICU approach:Within this model,RRT is usually prescribed by a nephrologist in the ICU and is initiated by a di
11、alysis nurse In this environment,IHD has the advantage of requiring only daily or alternate-day attendance by the renal teamConversely,the relative labor costs of providing CRRT are increased,an effect that is compounded by the larger fixed costs and higher consumable requirements of CRRTThese logis
12、tic factors have led to a preference for IHD over CRRT being maintained in ICUs that use the north American.,Nat.Rev.Nephrol.2010:6:521529.,Type of therapy,Clinical studies of CRRT in the ICUThe diversity of clinical approaches to the treatment of AKI in the ICU is illustrated by the results of the
13、BEST Kidney study,The multinational epidemiological study of RRT practice in the ICUStudy documented the treatment of AKI in 1,738 patients in 54 ICUs on five continents,Nat.Rev.Nephrol.2010:6:521529.,Type of therapy,BEST study resultsCRRT was the most common choice of initial RRT treatment,with 80%
14、of patients on CRRT;IHD use was mostly restricted to ICUs in north and south America,where it was used as initial therapy in 3040%of patients,while,by contrast,CRRT is used first in 100%of ICUs in Australia.Among patients receiving CRRT,however,marked variation in the modality,intensity,timing was o
15、bservedMaking it difficult to compare outcomes between patients on CRRT and those on IHD,Nat.Rev.Nephrol.2010:6:521529.,Type of therapy,Nat.Rev.Nephrol.2010:6:521529.,有些研究表明在ICU不稳定的患者中应用IHD也不会存在明显的问题,有RCTs并没有显示出CRRT优于IHD,Type of therapy,Kidney Int 2009,76:422-427.BMC Nephrol 2010,11:32.Nephrol Dial
16、Transplant 2009,24:512-518.Lancet 2006,368:379-385.,对于依赖血管活性药物的AKI患者，CRRT才是最适合的；依赖血管活性药物的AKI患者将来接受长期透析的几率CRRT 间断性治疗；AKI的急性期推荐应用CRRT，尤其是对于严重血流动力学不稳定、需大量清除液体以便于进行更有效药物治疗的患者。,Crit Care Med 2008,36:610-617.Kidney Int 2009,76:422-427.Nat Rev Nephrol 2010,9:521-529.Clin Pharmacol Ther 2009,86:562-565.,目前共
17、识：,Contents,Introduction,1,Type of therapy,2,Timing of CRRT,3,Dose of CRRT,4,Conclusions,5,6,Timing of CRRT,The right time to start RRT is still a topic of debate.主要的原因的是：没有一个明确的、协商一致的AKI定义能够根据肾损伤程度对患者进行分级研究时很难获得同种类相同特征的患者组人群RIFLE和AKIN分级标准使对于AKI的研究向前迈进了一大步两种分级标准均能使临床医生警惕AKI的出现，进行早期干预,Crit Care 2009,
18、13:211.,Timing of CRRT,There is significant variation in the timing of initiation of RRT,with up to two-fold differences in the reported values of BUN,creatinine,or urine output at RRT initiation.,Clinical studies evaluating the timing of initiation of CRRT in critically ill patients,Timing of CRRT,
19、In the above-mentioned studies there is a clear trend toward a better outcome with earlier timing of RRT.In the absence of large RCTs comparing early to late initiation of RRT,no firm overall recommendations for timing of RRT can be made.,Timing of CRRT,目前广为接受的Septic AKI开始RRT时机，尤其是在septic shock 时：RI
20、FLE injury stage(or AKIN stage 2)but consensus on this topic awaits results from large-scale RCTs.,Timing of CRRT,除AKI外，患者的一些其他情况也需要行早期RRT治疗：mainly pediatric,treated by ECMO for severe ARDS.Fluid overload definitely plays a role in timing,because CRRT proved successful in patients without AKI but re
21、fractory to diuretics.治疗时机的标准在不断发展，包括：severity of organ dysfunction(SOFA score)；severity of AKI(RIFLE or AKIN stage)；fluid overload status；time from admission；biomarker use,etc.但他们在日常临床实践中的应用价值仍然需要评估,Kidney Int 2010,77:469-470.Kidney Int 2009,76:1289-1292,J Am Soc Nephrol 2011,22:810-820.,Timing of
22、CRRT,When initiation of RRT is considered,it is important to realize that:the consequences of ureamic toxicity,metabolic acidosis and/or fluid overload are likely to be more severe in the critically ill patient.Moreover,renal function is unlikely to recover within a short period during persistent an
23、d severe failure of other organs.Furthermore,various inflammatory mediators are cleared by the kidney.,Timing of CRRT,最近的一项前瞻性研究和两项meta-analysis明确地支持early timing,The findings of these studies support earlier initiation of acute RRT,In the absence of new evidence from suitably-designed randomised tri
24、als,a definitive treatment recommendation cannot be made,Contents,Introduction,1,Type of therapy,2,Timing of CRRT,3,Dose of CRRT,4,Conclusions,5,6,Dose or intensity of CRRT,Dose or intensity of CRRT,Dose or intensity of CRRT,Both the ATN and RENAL studies failed to detect any survival benefit from m
25、ore-intensive RRT,And no significant differences in mortality rates were observed between high-intensity and low-intensity treatment in subgroups in either study.These results provide definitive evidence to recommend that escalation of CRRT intensity to beyond conventional doses of 25 ml/kg/h is not
26、 beneficial for unselected ICU patients with AKI.,Possible relationship between delivered dose of CRRT and survival,with results from the ATN and RENAL trials illustrated.,Dose or intensity of CRRT,而关于non-septic AKI 的治疗剂量，RENAL研究得到了一个明确的答案:Randomized Evaluation of Normal versus Augmented Levels(RENA
27、L)study:no beneficial effect of CVVHDF at 40 ml/kg/h compared with 25 ml/kg/h.Therefore,current consensus suggests a hemofiltration dose of 25 ml/kg/h in non-septic AKI with no additional benefit from a dose increase.,N Engl J Med 2009,361:1627-1638.,Dose or intensity of CRRT,然而，需要强调的是：专家的意见是患者治疗剂量要
28、足够，至少25 ml/kg/h。但实际中由于存在可预测的（bags change,nursing.）和不可预测的（surgery,clotting.）治疗中断，意味着剂量要在30-35 ml/kg/h；Septic AKI患者的治疗剂量目前仍存在争议，一些小的前瞻随机研究表明高剂量的血液滤过是有益的。多中心的“IVOIRE study”(hIgh Volume in Intensive care)，在sepsis引起的AKI，休克和多脏衰患者中，比较35 ml/kg/h vs.70 ml/kg/h，不久后，可能会对治疗剂量的争论有所定论。,Joannes-Boyau O,Honore PM:H
29、emofiltration Study:IVOIRE Study:clinicaltrials.gov ID NCT00241228.,last Accessed in June 2011.,Crit Care 2009,13:R57.J Nephrol 2011,24:165-176.,Dose or intensity of CRRT,“IVOIRE study”(hIgh Volume in Intensive care)初步结果：Although patients included were more severely ill,overall mortality in the IVOI
30、RE study remains very low(39%at 28 days and 52%at 90 days)compared with the RENAL study.This may be due to the earlier start of treatment at the renal injury level.Awaiting results from this important trial,35 ml/kg/h should remain the standard dose in septic AKI,particularly in the presence of shoc
31、k.,Joannes-Boyau O,Honore PM:Hemofiltration Study:IVOIRE Study:clinicaltrials.gov ID NCT00241228.,last Accessed in June 2011.,Contents,Introduction,1,Type of therapy,2,Timing of CRRT,3,Dose of CRRT,4,Conclusions,5,6,RRT in ICU:Preference,Decision about which technique to use depends on:1.What we wan
32、t to remove from the plasma,RRT in ICU:Preference,2.The patients cardiovascular statusCRRT causes less rapid fluid shifts and is the preferred option if there is any degree of cardiovascular instability.3.The availability of resourcesCRRT is more labour intensive and more expensive than IHDAvailabil
33、ity of equipment may dictate the form of RRT,RRT in ICU:Preference,4.The clinicians experienceIt is wise to use a form of RRT that is familiar to all the staff involved5.Other specific clinical considerationsConvective modes of RRT may be beneficial if the patient has septic shockCRRT can aid feedin
34、g regimes by improving fluid managementCRRT may be associated with better cerebral perfusion in patients with an acute brain injury or fulminant hepatic failure,许多问题悬而未决,标准与个体化,You are unique!,Standard!,Key Points,It is recommended to define ARF according to the RIFLE classification system into ARFr
35、isk,ARFinjury and ARFfailure.It is recommended to base the decision when to start RRT not only on the severity of ARF,but also on the severity of other organ failure.Initiation of RRT is to be considered in oliguric patients(RIFLErisk-oliguria or RIFLEinjury-oliguria),despite adequate fluid resuscit
36、ation,and/or a persisting steep rise in serum creatinine.,Key Points,RRT may be postponed when the underlying disease is improving,other organ failure recovering and the slope in the serum creatinine rise declines,in order to see if renal function is also recovering.It is recommended to continue RRT
37、 as long as the criteria defining severe oliguric ARF(RIFLEfailure-oliguria)are present.If the clinical condition improves,it may be considered to wait before connecting a new circuit to see whether renal function recovers.RRT should be restarted in case of clinical or metabolic deterioration.,Key P
38、oints,The recommended delivered(not prescribed)ultrafiltrate(dialysate)flow during CVVH(D)is 35 mL/kg/h in postdilution.A higher dose applied for a short period may be considered in Sepsis/SIRS.The dose needs to be adjusted for predilution.In non-shock patients,continuous and intermittent treatments are equivalent regarding survival.However,CRRT is recommended over IHD for patients with ARF who have,or are at risk for,cerebral oedema.CRRT is preferred in the management of patients with ARF and shock.,Thank You!,
