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- W2072085791 abstract "<h3>Importance</h3> Hemorrhage is the leading cause of death in military trauma and second leading cause of death in civilian trauma. Although many well-established animal models of hemorrhage exist in the trauma and anticoagulant literature, few focus on directly quantitating blood loss. <h3>Objective</h3> To establish and validate a reproducible rodent model of uncontrolled hemorrhage to serve as the foundation for developing therapies for noncompressible torso trauma. <h3>Design, Settings, and Subjects</h3> We developed and evaluated 4 different hemorrhage models using male Sprague-Dawley rats (6 rats/model), aged 10 to 14 weeks and weighing 330 to 460 g, at the Department of Surgery, Northwestern University. <h3>Interventions</h3> We used tail-cut (4 cm), liver punch biopsy (12 mm), liver laceration (3.0 × 1.5 cm), and spleen transection models. All animals underwent invasive hemodynamic monitoring. <h3>Main Outcomes and Measures</h3> Blood loss, expressed as a percentage of total blood volume (TBV), mean arterial pressure, and heart rate, which were recorded at 2- to 5-minute intervals. <h3>Results</h3> The tail-cut model resulted in a mean (SD) TBV loss of 15.4% (6.0%) with hemodynamics consistent with class I hemorrhagic shock. The liver punch biopsy model resulted in a mean (SD) TBV loss of 16.7% (3.3%) with hemodynamics consistent with class I hemorrhagic shock. The liver laceration model resulted in a mean (SD) TBV loss of 19.8% (3.0%) with hemodynamics consistent with class II hemorrhagic shock. The spleen transection model resulted in the greatest blood loss (<i>P</i> < .01), with a mean (SD) TBV loss of 27.9% (3.4%) and hemodynamics consistent with class II hemorrhagic shock. The liver laceration and punch biopsy models resulted in most of the blood loss within the first 2 minutes, whereas the spleen transection and tail-cut models resulted in a steady loss during 10 minutes. The liver laceration and spleen transection models resulted in the greatest degree of hemodynamic instability (mean [SD] arterial pressure decreases of 25 [1] and 41 [11] mm Hg, respectively). One-hour survival was 100% in all 4 models. <h3>Conclusions and Relevance</h3> We established and validated the reproducibility of 4 different rat models of uncontrolled hemorrhage. These models provide a foundation to design novel nonsurgical therapies to control hemorrhage, and the different degrees of hemorrhagic shock produced from these models allow for flexibility in experimental design." @default.
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- W2072085791 date "2015-04-01" @default.
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- W2072085791 title "Development and Validation of 4 Different Rat Models of Uncontrolled Hemorrhage" @default.
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- W2072085791 doi "https://doi.org/10.1001/jamasurg.2014.1685" @default.
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