LandmarkRCT

EOLIA

Extracorporeal Membrane Oxygenation for Severe Acute Respiratory Distress Syndrome

New England Journal of Medicine, 2018 · Multicenter, randomized controlled trial, unblinded, stopped early for futility with crossover

Clinical question

Does early venovenous ECMO reduce mortality in very severe ARDS, compared with continued conventional ventilation with rescue therapies?

Population: 249 patients with very severe ARDS (e.g. PaO2/FiO2 < 50 for > 3h, or < 80 for > 6h, or pH < 7.25 with hypercapnia).
Inclusion criteria: Very severe ARDS meeting one of several refractory-hypoxemia or refractory-acidosis thresholds.
Onset within the preceding 7 days.
Intervention: Early venovenous ECMO.
Comparator: Continued conventional lung-protective ventilation with rescue therapies; crossover to ECMO was allowed if the control group became refractory.
Primary outcome: 60-day all-cause mortality.
Secondary outcomes: Treatment failure (a composite including crossover to ECMO).
Result: The primary mortality comparison did not reach statistical significance, but 28% of the control group crossed over to ECMO, and pooled/Bayesian reanalyses suggest a plausible mortality benefit. (35% vs 46% 60-day mortality, p = 0.09)

What the trial found

Early ECMO in very severe ARDS did not significantly reduce 60-day mortality in the primary intention-to-treat analysis, but substantial crossover to ECMO in the control arm complicates interpreting this as a true null result.

Current guideline position

Guidelines and expert practice position ECMO as a rescue option in very severe, refractory ARDS at experienced centers, rather than a first-line therapy.

Clinical interpretation

EOLIA is generally read as supportive of ECMO in very severe, refractory ARDS despite the non-significant primary endpoint, given the crossover pattern and subsequent Bayesian reanalyses.

Limitations

High crossover rate (28%) from control to ECMO undermines a clean intention-to-treat interpretation.
Restricted to very severe ARDS meeting strict refractory-hypoxemia thresholds; not generalizable to moderate ARDS.

Moderate certainty

Clinical Context & Relevant Topics (2)

Disease Reference

Acute Respiratory Distress Syndrome

Acute, diffuse inflammatory lung injury causing hypoxemia and bilateral infiltrates not fully explained by cardiac failure or fluid overload.

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ECMO: Physiology, Bedside Management & Troubleshooting

Specialist-level VV/VA ECMO bedside management: selection, cannulation, gas exchange, hemodynamics, anticoagulation, circuit troubleshooting, organ support, ultrasound, ECPR, weaning and decannulation.

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