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Lower limb ischemia-reperfusion injury triggers a systemic inflammatory response and multiple organ dysfunction
Magdi M I Yassin1, Denis W Harkin, Aires A B Barros D'Sa
1Department of Surgery, The Queen's University of Belfast, Institute of Clinical Sciences, Grosvenor Road, Belfast BT12 6BJ, Northern Ireland, UK.
World Journal of Surgery
|March 19, 2002
Summary
Restoring blood flow to ischemic limbs can paradoxically cause organ damage. This study shows reperfusion significantly increases inflammatory cytokines like IL-6 and TNF-a, leading to multi-organ dysfunction and potential mortality.
Area of Science:
- Physiology
- Immunology
- Surgical Complications
Background:
- Restoration of blood flow to ischemic limbs can paradoxically lead to systemic complications and mortality.
- The precise mechanisms underlying these adverse effects, particularly the role of inflammatory mediators, require further elucidation.
Purpose of the Study:
- To investigate the impact of acute lower limb ischemia-reperfusion on systemic cytokine production.
- To assess the subsequent effects on remote organ function (lung, liver, kidney).
Main Methods:
- Male Wistar rats underwent 3 hours of hind limb ischemia followed by varying reperfusion periods (1, 2, or 3 hours).
- Plasma concentrations of tumor necrosis factor-alpha (TNF-a) and interleukin-6 (IL-6) were measured.
- Biochemical and histological analyses assessed lung, liver, and kidney function.
Main Results:
- Reperfusion significantly elevated plasma TNF-a and progressively increased IL-6 levels, with peak concentrations observed after 3 hours of reperfusion.
- Systemic IL-6 levels were significantly higher than portal concentrations.
- Reperfusion led to significant increases in markers of kidney and liver injury (urea, creatinine, AST, ALT, LDH).
Conclusions:
- Reperfusion of an acutely ischemic lower limb triggers a systemic inflammatory response.
- This inflammatory response contributes to multi-organ dysfunction and may explain the morbidity and mortality observed after limb reperfusion.