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Do we have enough evidence for ECMO in
Daniel Brodie, MDDirector, Medical ECMO Program
Co-Director, Center for Acute Respiratory Failure
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Faculty DisclosuresDaniel Brodie
• Maquet Cardiovascular– Research support
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ECMO for Adult ARDS
Current state of the evidence?
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1st Successful ECMO in an adult
1972
Hill DJ, et al. NEJM 1972
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1974
150 patientsECMO for acute respiratory
failure
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1979
NHLBI-sponsoredProspective RCTConventional MV alone vs. ECMO with MV
Zapol WM, et al. JAMA 1979
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9 centers90 subjects
Venoarterial ECMO
Survival: no difference9.5% ECMO
8.3% Conventional MV
1979
Zapol WM, et al. JAMA 1979
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Small studyLack of experience at some centers
Use of VAHigh dose anticoagulation
Excessive bleeding
Outdated, injurious MV strategies
Antiquated ECMO technology
1979
Criticisms
Zapol WM, et al. JAMA 1979
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1980
“Rest the lung”Extracorporeal CO2 Removal
(ECCO2R)
Gattinoni L, et al. Lancet 1980
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1986
ECCO2RP:F < 100
Rest Settings with “apneic oxygenation”RR 3-5
PIP 35-40PEEP 15-25
Survival 48.8%
JAMA 1986;256:881
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2nd RCT: UtahECCO2R
40 patientsSevere ARDS
Conventional MV vs.
PC-IRV then ECCO2R with Low Frequency
Morris AH, et al. AJRCCM 1994;149:295
1994
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2nd RCT: Utah
No difference in survivalP = 0.8
42% Conventional MV
33% PC-IRV with ECCO2R
Morris AH, et al. AJRCCM 1994;149:295
1994
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2nd RCT: Utah
Small study
Single center
Inexperienced: only 2 prior patients(Milan Fellow)
Morris AH, et al. AJRCCM 1994;149:295
1994
Criticisms
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2nd RCT: UtahOutdated, injurious MV strategies
Mean PIP 45.4 with ECCO2R
Two separate interventions (PC-IRV & ECCO2R)
Excessive bleeding
Outdated ECMO technology
Morris AH, et al. AJRCCM 1994;149:295
1994
Criticisms
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After 2 RCTs
Conclusion
ECMO for ARDS in adults does not work
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Why are we here?
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Observational studies1990s2000s
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Observational studies
Survival with ECLS47-66%
ECMOECCO2RAVCO2R
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2009 H1N1 Influenza Pandemic
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Davies A, for the ANZ ECMO Influenza Investigators. JAMA
2009;302:1888
15 ICUs in Australia & New ZealandECMO for H1N1-associated ARDS
68 patientsMedian age 34.4
Median P:F 56
Survival 75%
JAMA 2010;303:941
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ELSOExtracorporeal Life Support Organization
Adult H1N1 RegistryAs of April 2011
238 cases
67% survival
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Observational trials
Confounded by indication
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Observational TrialsHow do you compare severity?
No standard definition“Severe” ARDS
How do you estimate what mortality should be?
P:FALIS
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Secular Trends in Critical CareImprovements in Outcomes
• Ventilator management• Fluid management• Prevention of infection (CLABSIs, VAPs,
CAUTIs)• Trauma management• Sedation protocols• Physical & occupational therapy
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Mortality from ARDS University of Washington
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Is it the ECMO?
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Miller RR, et al. Chest 2010;137:752
ICU in Utah30 patients with H1N1-associated
ARDSMedian age 34Median P:F 61
Not treated with ECMO
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Chest 2010;137:752
Survival 73%
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Is it the ECMO?
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Reasons to believe it worksRationale: buy time with “lung rest”
Advances in technologyPumps
OxygenatorsBiocompatible circuits
Catheters
Improved techniquesDecreased anticoagulation
Miniaturized set upsImproved lung rest
Greater experience
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Is it the referral center doing the ECMO?
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Noah et al. JAMA 2011
2009-2010H1N1-related ARDS
“ECMO-referred patients” (80)Transferred for ECMO
Any of 4 adult ECMO centers in the UK
Matched with. . .
“Non-ECMO-referred patients” (1756)
Swine Flu Triage Study
Concurrent, longitudinal, cohort study
Critically ill patients with H1N1
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80 ECMO-referred69 received ECMO (86.3%)
Hospital mortality 27.5%
59 matched pairs (individual matching)23.7% ECMO-referred vs. 52.5%
75 matched pairs (propensity score matching)24.0% ECMO-referred vs. 46.7%
75 matched pairs (GenMatch matching)24.0% ECMO-referred vs. 50.7%
Noah et al. JAMA 2011
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“Referral & transfer to an ECMO center was associated with lower hospital mortality
compared with matched non-ECMO-referred patients”
Noah et al. JAMA 2011
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Does ECMO improve clinical outcomes in severe ARDS?
Need a modern RCT
Modern technologyModern techniques
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Peek G, et al. Lancet 2009;374:1351
2009
180 adults Severe but potentially reversible respiratory
failure
Randomized. . .
CESAR
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Peek G, et al. Lancet 2009;374:1351
Continued conventional management at a designated treatment center
Vs.
Consideration for treatment with ECMO
[75% received ECMO]
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Peek G, et al. Lancet 2009;374:1351
Death or severe disability at 6 months
53% conventional arm
37% consideration for treatment with ECMO
16% absolute reduction in primary endpoint
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Peek G, et al. Lancet 2009;374:1351
Criticisms Not a trial of MV vs. ECMO
Referral to a highly specialized center With a standardized management protocolIncluded consideration for treatment with
ECMO
Wealth of ECMO experience
Advanced therapiesMARS in 17%
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Peek G, et al. Lancet 2009;374:1351
Criticisms
Conventional MV arm not standardizedOnly 70% received low-volume, low-
pressure ventilation at any time(Standard of care)
93% at GlenfieldDue to better care or because ECMO
facilitated?
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Do we need another modern RCT?
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Clinical equipoise?
Miller FG, Joffe S. NEJM 2011;364:476
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“To clinicians familiar with ECMO. . . the available data would seem to validate ECMO support as reasonable therapy for patients whose conditions do not
respond to conventional care. To those who regard ECMO. . . as unproven or misguided, this study [CESAR] may
reinforce the belief that there is little or no evidence to support its use.”
Dalton HJ, MacLaren G. CCM 2010;381:1484
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“For the moment the use of this therapy will remain driven by enthusiasts. . . . Others will need more convincing.”
Clinical equipoise writ large
Pellegrino VA, Davies AR. Critical Care Resuscitation 2010;12:75
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With or without equipoise
“When treatments are likely to be very expensive, and their clinical benefits
are uncertain based on current knowledge, it becomes all the more
important to develop sufficiently rigorous evidence about their risks and
Miller FG, Joffe S. NEJM 2011;364:476
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“. . . evaluation in [RCTs] should be the default. . . before new treatments are approved and covered solely on the basis of evidence from uncontrolled
trials.”
Miller FG, Joffe S. NEJM 2011;364:476
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We need another RCT
What would a new RCT look like?
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An ideal RCT?Multiple ECMO centers
Standardized ECMO protocolsStrict enrollment criteria
Any transportation on ECMO
Standardized conventional MVARDSNet ARMA
Express
NEJM 2000;342:1301Mercat A, et al. JAMA 2008;299:646
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An ideal RCT?
A priori comparison of early vs. late initiation
Use of restrictive transfusion thresholds?
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EOLIA
ECMO to Rescue Lung Injury in severe ARDS
Department de la Recherche Clinique et du Developpement
Assistnace Publique-Hopitaux de Paris
Professor Alain CombesInstitut de Cardiologie, Group Hospitalier Pitie-
Salpetriere
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Conclusion
ECMO likely has a role in severe ARDS
But. . .
We need more evidence
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