Early versus delayed restoration of flow with temporary vascular shunt reduces circulating markers of injury in a porcine model

Shaun M. Gifford, Jonathan L. Eliason, W. Darrin Clouse, Jerry R. Spencer, Gabe E. Burkhardt, Brandon W. Propper, Patricia S. Dixon, Lee Ann Zarzabal, Jonathan A. Gelfond, Todd E. Rasmussen

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

BACKGROUND: Temporary vascular shunting to restore flow after vascular injury has been advocated. The effectiveness of this adjunct in protecting against ischemic injury has not been established. This study will assess the temporal impact of shunts on ischemic injury and arterial flow. METHODS: A porcine model of hind-limb ischemia via iliac artery occlusion was used (N = 36; weight [kg] ± SD: 89 ± 4.4). Animals were randomized into one control (Iscctrl) and four study groups (Isc0, Isc1, Isc3, and Isc6) according to ischemic time. Shunt placement followed ischemia, and flow and circulating injury markers were collected incrementally during 18 hours of reperfusion. Flow proportions and a calculated Ischemia Injury Index were used to characterize group differences. RESULTS: There were no intergroup differences concerning initial weight, hemodynamic, or laboratory values. Shunt patency was 92% in the absence of anticoagulation. The proportion of common femoral arterial flow to baseline flow in the Isc6 group was lower than the Iscctrl group (p = 0.02). There was a similar trend with the Isc1 and Isc3 groups. The Ischemia Injury Index demonstrated that there was a difference in the Isc3 and Isc6 groups (late shunt placement) compared with the Iscctrl, Isc0, and Isc1 groups (early shunt placement) (p < 0.001). CONCLUSION: This study provides physiologic insight into the benefit of shunts in a model of extremity ischemia. Early shunting protects the extremity from further ischemic insult and reduces circulating markers of tissue injury. Additionally, the presence of a shunt does not increase the Ischemic Injury Index and patency is maintained in the absence of heparinization.

Original languageEnglish (US)
Pages (from-to)259-265
Number of pages7
JournalJournal of Trauma - Injury, Infection and Critical Care
Volume67
Issue number2
DOIs
StatePublished - Aug 2009

Keywords

  • Temporary shunt
  • Temporary vascular shunt
  • Vascular adjunct
  • Vascular injury
  • Vascular trauma
  • Wartime vascular injury

ASJC Scopus subject areas

  • Surgery
  • Critical Care and Intensive Care Medicine

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