RESUSCITATIVE ENDOVASCULAR BALLOON OCCLUSION OF THE AORTA (REBOA) FOR MAJOR ABDOMINAL VENOUS INJURY IN A PORCINE HEMORRHAGIC SHOCK MODEL.

BACKGROUND: Resuscitative Endovascular Balloon Occlusion of the Aorta (REBOA) is a rescue maneuver for unstable patients with non-compressible hemorrhage below the diaphragm. The efficacy of REBOA in the setting a major abdominal venous injury is unknown. Our objective was to examine the use of REBOA in a large animal model of major abdominal venous injury, and characterize any impact on the hemodynamics, rate and volume of hemorrhage, and survival. METHODS: Ten swine (35-55kg) underwent a controlled and validated hemorrhage and ischemia/reperfusion injury protocol to produce shock physiology. Animals were randomly assigned to a control arm (N=5) or a treatment (REBOA) arm (N=5). An injury was then created in the common iliac vein. Bleeding was allowed for 60 seconds and the balloon was then inflated in the REBOA arm. Hemodynamics were recorded for 45 minutes or until death. Blood loss was verified post-mortem and bleeding rate calculated. RESULTS: All animals demonstrated shock physiology at the time of randomization. There were no differences between control versus REBOA animals in baseline MAP (42 vs 50), pH (7.29 vs 7.26), lactate (6.19 vs 6.26), or INR (1.2 vs 1.3, all p=NS). REBOA animals demonstrated immediate improvements in MAP (50.6 vs 97.2, p=0.04). The mean survival time was 4.1 minutes for controls (100% died) versus 40.1 minutes for REBOA (p

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