Evaluating intramuscular epinephrine in pediatric out-of-hospital cardiac arrest (the PRIME trial): study protocol for a multi-centre, stepped-wedge cluster quasi-randomized controlled trial.
Idrees Samina S, Assaf Maysaa M, Davis Matthew M, Garcia-Bournissen Facundo F et al.
Pediatric out-of-hospital cardiac arrest (POHCA) is a time-sensitive event with a high mortality rate. Epinephrine is a key first-line medication used during cardiac arrest resuscitation to support perfusion and return of spontaneous circulation (ROSC). Guidelines for the management of POHCA recommend paramedics administer epinephrine as soon as possible by intravenous (IV) or intraosseous (IO) injection. However, successfully inserting an IV or IO line can be challenging in high-stress situations, particularly in a poorly perfused, small child. In contrast, intramuscular (IM) epinephrine, which is the standard of care in anaphylaxis management, does not require paramedics to secure vascular access and may lead to a shorter time to first dose. The POHCA Resuscitation: Evaluation of IM Epinephrine (PRIME) trial aims to evaluate the impact of IM epinephrine on POHCA outcomes. The primary objective of the PRIME trial is to determine if an initial dose of IM epinephrine improves time to return of spontaneous circulation (ROSC) compared to standard of care alone. The PRIME trial is a prospective, multi-centre, pragmatic, two-arm, open-label, stepped-wedge cluster quasi-randomized controlled trial. We will randomize at the level of the paramedic service, as individual-level randomization is not possible due to the inclusion of multiple, heterogeneous regions. Each site will serve as its own control. This study is a regional trial, with a focus on limited efficacy testing through an intermediate outcome (i.e., time to ROSC) that is strongly associated with survival. We also aim to evaluate the impact of the intervention on survival to hospital discharge, survival to hospital discharge with favourable neurological outcome, and safety in POHCA management. The PRIME trial aims to provide insight into the effectiveness and safety of IM epinephrine in POHCA. The data and analyses generated from the trial have the potential to inform resuscitation guidelines and standard of care practices. ClinicalTrials.gov NCT05166343, Registered on December 8, 2021.