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Histologic and ultrastructural changes in nonpulmonary organs during early hyperdynamic sepsis
M Hersch1, A A Gnidec, A D Bersten
1Richard Ivey Critical Care Trauma Centre, Victoria Hospital Corporation, London, Ontario, Canada.
Surgery
|April 1, 1990
Summary
This study on bacterial sepsis in an animal model found that tissue injury, including edema and cell damage, occurred before significant organ failure. This suggests early cellular changes are key in sepsis progression.
Area of Science:
- Pathology
- Sepsis Research
- Animal Models
Background:
- Previous sepsis studies may be confounded by pre-existing conditions or treatments.
- Understanding sepsis-induced organ damage requires examining histologic changes independent of shock states.
Purpose of the Study:
- To evaluate non-pulmonary histologic findings in a validated animal model of sepsis.
- To characterize tissue injury in normotensive sepsis before the development of multi-system organ failure.
Main Methods:
- Cecal ligation and perforation model in animals.
- Monitoring hemodynamic parameters (mean arterial pressure, systemic flow).
- Histologic examination of multiple organs (myocardium, muscle, liver, gut, pancreas) over 3 days.
Main Results:
- Hyperdynamic septic state with mild organ dysfunction (elevated bilirubin, decreased total protein).
- Widespread histologic changes observed: interstitial/intracellular edema, mitochondrial damage, cell necrosis.
- Pancreatic lesions were more severe; only the liver showed neutrophil accumulation.
- Absence of fibrin thrombi in microvasculature, differentiating from septic shock models.
Conclusions:
- Tissue injury, marked by protein-rich edema and cellular damage, precedes significant organ failure in normotensive sepsis.
- Reversible and irreversible cell injury are early indicators of sepsis progression.
- This model provides insights into sepsis-related tissue damage without confounding shock or therapeutic effects.