Continuous renal replacement therapy with cytokine-adsorbing hemofilter to control resuscitative endovascular balloon occlusion of the aorta-related ischemia-reperfusion injury in a swine hemorrhagic shock model.

PURPOSE: Resuscitative endovascular balloon occlusion of the aorta (REBOA) is beneficial for uncontrollable torso bleeding; however, prolonged REBOA causes ischemia-reperfusion injury. The purpose of this study is to examine the hypothesis that continuous renal replacement therapy (CRRT) with a cytokine-adsorbing hemofilter would improve mortality due to hemorrhagic shock with REBOA-reperfusion injury by controlling metabolic acidosis, hyperkalemia, and hypercytokinemia.

METHODS: Hemorrhagic shock with 40% blood loss was induced by phlebotomy in eight female swine. CRRT was performed on four swine after 90 min of REBOA, and the remaining four swine (control group) underwent the same procedures except for CRRT. We evaluated the survival time and trends of pH, HCO3-, potassium, lactate, circulatory inflammatory cytokines, and histopathology of the intestine for 180 min after REBOA deflation.

RESULTS: Two swine in the CRRT group and one in the control group survived; no significant difference were observed in survival rates between the groups (p = 0.45). Furthermore, no significant differences in the transition of biomarkers and histopathological grades were observed between the groups. The CRRT group showed a tendency of increasing pH and HCO3-, decreasing lactate, lower elevation of potassium and cytokine levels (interleukin 6, CRRT: 1008.5 [770.4-1246.6], control; 1636.7 [1636.7-1636.7] pg/mL at t = 270), and lower intestine histopathological grade (jejunum, CRRT; 1.5 [1.3-1.8], control; 4.0 [4.0-4.0], ileum, CRRT; 1.5 [1.3-1.8], control; 4.0 [4.0-4.0] at t = 270) than the control group.

CONCLUSIONS: CRRT may mitigate acute-REBOA-related ischemia-reperfusion injury by controlling biomarkers. Further research is required to evaluate the impact on long-term mortality.