Introduction: It is unknown if the anatomical distance of intraosseous (i.o.) epinephrine injection from the heart affects resuscitative outcome. The purpose of this study was to explore the relationships between the anatomical distance of i.o. epinephrine injection and measures of resuscitative outcome in an adult swine model of ventricular fibrillation (VF).
Methods: Thirty-two Yorkshire-cross swine (60-80 kg) were randomly assigned to four groups: humeral i.o. (HIO), tibial i.o. (TIO), i.v. with defibrillation and epinephrine, and i.v. control: with defibrillation but no epinephrine. Ventricular fibrillation was induced. Swine remained in VF for 4 minutes prior to mechanical chest compressions. After 6 minutes in VF, swine were defibrillated and epinephrine (0.01 mg/kg) administered by group assignment. Defibrillation was repeated every 2 minutes. Epinephrine was repeated every 4 minutes. Interventions continued until return of spontaneous circulation (ROSC) or 26 post-arrest minutes elapsed. Swine achieving ROSC were observed for 30 minutes post-ROSC.
Results: There were no significant differences between the HIO, TIO, and i.v. groups relative to the occurrence of ROSC (P > .05 in all cases), 30-minute post-ROSC survival (P > .05 in all cases), and time to ROSC (P = .43). There were significant differences between the HIO, TIO, and i.v. groups compared to the control group relative to the occurrence of ROSC (P = .02, .01, and .007 respectively), and 30 minute post-ROSC survival (P = .05, .03, and .007, respectively).
Conclusion: The anatomical distance of i.o. epinephrine injection from the heart did not affect short-term measures of resuscitative outcome in an adult swine model of VF including the occurrence of ROSC, 30 minute post-ROSC survival, and time to ROSC. Rapidly administered epinephrine, irrespective of route of administration, increased the chance ROSC and survival to 30 minutes post-ROSC would occur in this study.
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