Hemorrhage remains a leading cause of preventable death in trauma, emphasizing the importance of early bleeding control. In addition to mechanical hemostasis, effective management of trauma-induced coagulopathy (TIC) plays a critical role in improving outcomes. TIC is a multifactorial condition with diverse phenotypes, involving complex pathophysiology. These variations complicate early diagnosis and targeted treatment. In the prehospital setting, phenotype-based management is not feasible; thus, empirical strategies have been adopted. Administration of tranexamic acid and prehospital whole blood transfusion have shown clinical benefit in selected trauma populations. Upon hospital arrival, fixed-ratio massive transfusion protocols and whole blood resuscitation provide broad support for coagulopathic states and have proven effective in reducing early mortality. However, these approaches may not fully account for individual variation in coagulation profiles. Viscoelastic assays allow real-time evaluation of coagulation status and offer the potential for individualized, goal-directed therapy. While some studies suggest improved outcomes with viscoelastic-guided resuscitation, evidence of clear superiority over conventional methods remains limited. Further research is needed to determine the optimal resuscitation strategy and integrate both empirical and precision-based approaches in TIC management.
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Methods Ten healthy Landrace/Large-White piglets aged 10–12 weeks with average weight 20±1 kg were used in this study. The protocol was divided into four distinct phases: stabilization, hemorrhagic, cardiac arrest, and resuscitation phases. We measured Pmsf at 5–7.5 seconds after the onset of cardiac arrest and then every 10 seconds until 1 minute postcardiac arrest. During resuscitation, lactated Ringers was infused at a rate that aimed for a mean right atrial pressure of ≤4 mm Hg. No vasopressors were used.
Results The mean volume of blood removed was 860±20 ml (blood loss, ~61%) and the bleeding time was 43.2±2 minutes while all animals developed pulseless electrical activity. Mean Pmsf was 4.09±1.22 mm Hg, and no significant differences in Pmsf were found until 1 minute postcardiac arrest (4.20±0.22 mm Hg at 5–7.5 seconds and 3.72±0.23 mm Hg at 55– 57.5 seconds; P=0.102). All animals achieved return of spontaneous circulation (ROSC), with mean time to ROSC being 6.1±1.7 minutes and mean administered volume being 394±20 ml.
Conclusions For the first time, Pmsf was estimated after severe hemorrhagic shock. In this study, Pmsf remained stable during the first minute post-arrest. All animals achieved ROSC with goal-directed fluid resuscitation and no vasopressors.
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