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Updated: Jul 17, 2026
16:31
Fixed Volume or Fixed Pressure: A Murine Model of Hemorrhagic Shock
Published on: June 6, 2011
Cerebrovascular resuscitation after polytrauma and fluid restriction
Steven A Earle1, Marc A de Moya, Jennifer E Zuccarelli
1Dewitt-Daughtry Family Department of Surgery, Divisions of Trauma and Surgical Critical Care, University of Miami Miller School of Medicine, Miami, FL, USA.
Journal of the American College of Surgeons
|January 27, 2007
Summary
Fluid restriction and Hextend optimize cerebrovascular resuscitation after polytrauma. This study found that limiting intravenous fluids and using Hextend improved brain oxygenation and reduced intracranial pressure in swine models.
Area of Science:
- Trauma and Injury Research
- Neurocritical Care
- Resuscitation Science
Background:
- Developing reproducible models for blast injury is crucial for evaluating therapies.
- Existing models are insufficient for assessing interventions in polytrauma.
- This study aimed to create a clinically relevant polytrauma model to test fluid resuscitation strategies.
Purpose of the Study:
- To test the hypothesis that cerebrovascular resuscitation is optimized with restricted intravenous fluid administration.
- To compare the efficacy of normal saline (NS) versus Hextend in managing polytrauma patients.
- To evaluate the impact of fluid management on intracranial pressure and brain oxygenation.
Main Methods:
- A polytrauma model was created in swine using blast injuries to the head and chest.
- Resuscitation involved phased administration of fluids (NS or Hextend) and vasopressors to maintain specific mean arterial pressure (MAP) and cerebral perfusion pressure (CPP) targets.
- Different fluid restriction levels and fluid types (NS vs. Hextend) were compared across four groups.
Main Results:
- Fluid restriction and Hextend administration led to lower intracranial pressure compared to normal saline.
- Hextend resulted in immediate and sustained improvements in MAP and CPP with minimal volume.
- Brain tissue oxygenation remained adequate with fluid restriction and Hextend, unlike with high-volume NS resuscitation.
Conclusions:
- Intracranial hypertension was attenuated, and brain oxygenation was maintained with intravenous fluid restriction.
- Cerebrovascular resuscitation was optimized with Hextend compared to normal saline in this polytrauma model.
- Further long-term studies are necessary to determine the neuropathologic consequences of these resuscitation strategies.
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