Poloxamer-188 Reduces Muscular Edema After Tourniquet-Induced Ischemia-Reperfusion Injury in Rats
Abstract
Background: Skeletal muscle injury can result in significant edema, which can in turn lead to the development of acute extremity compartment syndrome (CS). Poloxamer-188 (P-188), a multiblock copolymer surfactant, has been shown to decrease edema by sealing damaged membranes in a number of tissues after a variety of injury modalities. The objective is to determine whether the administration of P-188 significantly reduces skeletal muscle edema associated with ischemia/reperfusion injury (I-R). Methods: Male Sprague-Dawley rats underwent 180 minutes of tourniquetinduced ischemia. Five minutes before tourniquet release, rats received either a bolus of (1) P-188 (150 mg/kg; P-188 group) or (2) vehicle (Vehicle group) via a jugular catheter (n - 10 per group). After 240 minutes reperfusion, both groups received a second bolus of either P-188 (P-188) or vehicle (Vehicle) via a tail vein catheter. Sixteen hours later, rats were killed; muscle weights were determined, infarct size (2,3,5-triphenyltetrazolium chloride method), and blinded histologic analysis (hematoxylin and eosin) were performed on the gastrocnemius and tibialis anterior muscles, as well as indices of antioxidant status. Results: P-188 resulted in significantly less edema (wet weight) and reduced an index of lipid peroxidation compared with Vehicle (p < 0.05). Wet:dry weight ratios were less in the P-188 group (indicating less edema). Muscle viability as indicated by 2,3,5-triphenyltetrazolium chloride staining or routine histology did not reveal statistically significant differences between groups. Conclusion: P-188 significantly reduced ischemia-reperfusion-related muscle edema and lipid peroxidation but did not impact muscle viability. Excess edema can lead to acute extremity CS, which is associated with significant morbidity and mortality. P-188 may provide a potential adjunctive treatment for the reduction of CS.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 2011
- Accession Number
- ADA618970
Entities
People
- Janet L. Roe
- Michael A. Dubick
- Robert J Christy
- Thomas J. Walters
- Vincent J. Mase Jr.
Organizations
- United States Army Institute of Surgical Research