Purpose: Venoarterial extracorporeal membrane oxygenation (V-A ECMO) can be used to support severely ill patients with cardiogenic shock. While age is commonly used in patient selection, little is known regarding its association with outcomes in this population. We sought to evaluate the association between increasing age and outcomes following V-A ECMO.

Methods: We used individual-level patient data from 440 centers in the international Extracorporeal Life Support Organization registry. We included all adult patients receiving V-A ECMO from 2017 to 2019. The primary outcome was hospital mortality. Secondary outcomes included a composite of complications following initiation of V-A ECMO. We conducted Bayesian analyses of the relationship between increasing age and outcomes of interest.

Results: We included 15,172 patients receiving V-A ECMO. Of these, 8172 (53.9%) died in hospital. For the analysis conducted using weakly informed priors, and as compared to the reference category of age 18–29, the age bracket of 30–39 (odds ratio [OR] 0.94, 95% credible interval [CrI] 0.79–1.10) was not associated with hospital mortality, but age brackets 40–49 (odds ratio [OR] 1.26, 95% CrI: 1.08–1.47), 50–59 (OR 1.78, 95% CrI: 1.55–2.06), 60–69 (OR 2.24, 95% CrI: 1.94–2.59), 70–79 (OR 2.90, 95% CrI: 2.49–3.39) and ≥ 80 (OR 4.02, 95% CrI: 3.13–5.20) were independently associated with increasing hospital mortality. Similar results were found in the analysis conducted with an informative prior, as well as between increasing age and post-ECMO complications.

Conclusions: Among patients receiving V-A ECMO for cardiogenic shock, increasing age is strongly associated with increasing odds of death and complications, and this association emerges as early as 40 years of age