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Resuscitation Fluid with Drag Reducing Polymer Enhances Cerebral Microcirculation and Tissue Oxygenation After Traumatic Brain Injury Complicated by Hemorrhagic Shock

  • D. E. Bragin
  • D. A. Lara
  • O. A. Bragina
  • M. V. Kameneva
  • E. M. Nemoto
Chapter
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 1072)

Abstract

Traumatic brain injury (TBI) is frequently accompanied by hemorrhagic shock (HS) which significantly worsens morbidity and mortality. Existing resuscitation fluids (RF) for volume expansion inadequately mitigate impaired microvascular cerebral blood flow (mvCBF) and hypoxia after TBI/HS. We hypothesized that nanomolar quantities of drag reducing polymers in resuscitation fluid (DRP-RF), would improve mvCBF by rheological modulation of hemodynamics. Methods: TBI was induced in rats by fluid percussion (1.5 atm, 50 ms) followed by controlled hemorrhage to a mean arterial pressure (MAP) = 40 mmHg. DRP-RF or lactated Ringer (LR-RF) was infused to MAP of 60 mmHg for 1 h (pre-hospital), followed by blood re-infusion to a MAP = 70 mmHg (hospital). Temperature, MAP, blood gases and electrolytes were monitored. In vivo 2-photon laser scanning microscopy was used to monitor microvascular blood flow, hypoxia (NADH) and necrosis (i.v. propidium iodide) for 5 h after TBI/HS followed by MRI for CBF and lesion volume. Results: TBI/HS compromised brain microvascular flow leading to capillary microthrombosis, tissue hypoxia and neuronal necrosis. DRP-RF compared to LR-RF reduced microthrombosis, restored collapsed capillary flow and improved mvCBF (82 ± 9.7% vs. 62 ± 9.7%, respectively, p < 0.05, n = 10). DRP-RF vs LR-RF decreased tissue hypoxia (77 ± 8.2% vs. 60 ± 10.5%, p < 0.05), and neuronal necrosis (21 ± 7.2% vs. 36 ± 7.3%, respectively, p < 0.05). MRI showed reduced lesion volumes with DRP-RF. Conclusions: DRP-RF effectively restores mvCBF, reduces hypoxia and protects neurons compared to conventional volume expansion with LR-RF after TBI/HS.

Notes

Acknowledgments

Supported by DOD DM160142, R21NS091600 and RMSE № 17.1223.2017/AP.

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • D. E. Bragin
    • 1
  • D. A. Lara
    • 1
  • O. A. Bragina
    • 1
  • M. V. Kameneva
    • 2
  • E. M. Nemoto
    • 1
  1. 1.Department of NeurosurgeryUniversity of New Mexico School of MedicineAlbuquerqueUSA
  2. 2.McGowan Institute for Regenerative MedicineUniversity of PittsburghPittsburghUSA

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