A comparison of etanercept vs. infliximab for the treatment of post-arrest myocardial dysfunction in a swine model of ventricular fibrillation

Abstract

AimsTo compare the effects of two TNF-α antagonists, etanercept and infliximab, on post-cardiac arrest hemodynamics and global left ventricular function (LV) in a swine model following ventricular fibrillation (VF). MethodsDomestic swine (n=30) were placed under general anesthesia and instrumented before VF was induced electrically. After 7min of VF, standard ACLS resuscitation was performed. Animals achieving return of spontaneous circulation (ROSC) were randomized to immediately receive infliximab (5mg/kg, n=10) or etanercept (0.3mg/kg [4mg/m2], n=10) or vehicle (250mL normal saline [NS], n=10) and LV function and hemodynamics were monitored for 3h. ResultsFollowing ROSC, mean arterial pressure (MAP), stroke work (SW), and LV dP/dt fell from pre-arrest values in all groups. However, at the 30min nadir, infliximab-treated animals had higher MAP than either the NS group (difference 14.4mmHg, 95% confidence interval [CI] 4.2–24.7) or the etanercept group (19.2mmHg, 95% CI 9.0–29.5), higher SW than the NS group (10.3 gm-m, 95% CI 5.1–15.5) or the etanercept group (8.9gm-m, 95% CI 4.0–14.4) and greater LV dP/dt than the NS group (282.9mmHg/s, 95% CI 169.6–386.1 higher with infliximab) or the etanercep group (228.9mmHg/s, 95% CI 115.6–342.2 higher with infliximab). ConclusionsOnly infliximab demonstrated a beneficial effect on post cardiac arrest hemodynamics and LV function in this swine model. Etanercept was no better in this regard than saline.