Retrohepatic Vena Cava (RIVC) Injuries are often lethal due to challenges in obtaining hemorrhage control. We hypothesized that packing with a new kaolin-based hemostatic dressing (Z-Medica, Control + ®) would improve hemorrhage control from a penetrating RIVC injury compared to packing with standard laparotomy sponges alone.
Twelve male Yorkshire pigs received a 25% exchange transfusion of blood for refrigerated normal saline to induce a hypothermic coagulopathy. A laparotomy was performed and a standardized 1.5cm injury to the RIVC was created which was followed by temporary abdominal closure and a period of uncontrolled hemorrhage. When the mean arterial pressure reached 70% of baseline, demonstrating hemorrhagic shock, the abdomen was re-entered and the injury was treated with perihepatic packing using standard laparotomy sponges (L; n=6) or a new kaolin-based hemostatic dressing (K; n=6). Animals were then resuscitated for 6 hours with crystalloid solution. The two groups were compared using the Wilcoxon rank sum test and Fisher exact test. A p≤0.05 was considered statistically significant.
There was no difference in the animal's temperature, heart rate, mean arterial pressure, cardiac output, and blood loss at baseline or before packing was performed (all p>0.05). In the laparotomy sponge group, 5 of 6 pigs survived the entire study period while all 6 pigs treated with kaolin-based D2 hemostatic dressings survived. Importantly, there was significantly less blood loss after packing with the new hemostatic kaolin-based dressing compared to packing with laparotomy sponge (651mL±180 vs 1073mL±342; p≤0.05).
These results demonstrate that the use of this new hemostatic kaolin-based dressing improved hemorrhage control and significantly decreased blood loss in this penetrating RIVC model.
Level V. This is basic science research based on a large animal model.