Izawa Y, Hishikawa S, Matsumura Y, et al. - Researchers investigated the change of venous and portal venous blood flow during resuscitative endovascular balloon occlusion of the aorta (REBOA) in a porcine model. They anesthetized seven pigs, and placed a REBOA catheter. Using phase-contrast MRI, they performed measurement of the blood flows of the inferior vena cava (IVC), hepatic vein (HV), portal vein (PV), and superior vena cava (SVC), in both the balloon deflated (no-REBOA) and fully balloon inflated (REBOA) states. Blood flows of the IVC, HV, and PV decreased and blood flow of the SVC increased following resuscitative endovascular balloon occlusion of the aorta. The collateral flow from the lower body to the SVC may explain this result. They emphasize enhancing the understanding of the effect of REBOA on the venous and portal venous systems as it may aid in controlling liver injury.