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Endothelialized Microfluidics for Studying Microvascular Interactions in Hematologic Diseases
Published on: June 22, 2012
The role of microvascular thrombosis in sepsis
1Intensive Care Centre, St Vincent's Hospital, Melbourne, Victoria.
Abstract:
The acute inflammatory response to sepsis gives rise to significant morbidity and mortality. The mechanisms underlying this form of tissue injury are poorly understood. This review examines the evidence that tissue ischaemia due, to generalized microvascular thrombosis may play an important role. Microvascular thrombosis is probably an adaptive response that prevents bacteria in the tissues reaching the systemic circulation via the capillaries. In time, a definitive response by leucocytes removes the bacteria and repairs the damaged tissues. There is however evidence that if microvascular thrombosis becomes generalized, then extensive tissue ischaemia may precipitate organ failure and death. Post-mortem studies of patients with sepsis demonstrate microvascular thrombi in many organs including the kidney, liver, lung, gut, adrenals and brain, and the degree of organ injury is related to the quantity of thrombi. Furthermore studies in human and animal models of sepsis demonstrate therapies that inhibit coagulation or promote fibrinolysis reduce organ failure and mortality. In view of the personal and economic burdens that tissue injury associated with the acute inflammatory response places on the community, further studies to establish the role of microvascular thrombosis are clearly required. Such studies may lead to new therapies to limit or prevent this form of injury.
Insights
Generalized microvascular thrombosis during sepsis may cause organ failure. Inhibiting coagulation or promoting fibrinolysis shows promise in reducing sepsis-related mortality and organ damage.
Area of Science:
- Sepsis Pathophysiology
- Inflammatory Response
- Vascular Biology
Background:
- Sepsis causes significant morbidity and mortality.
- Mechanisms of sepsis-induced tissue injury are not fully understood.
- Microvascular thrombosis is a potential contributor to sepsis-related organ damage.
Purpose of the Study:
- To review evidence linking generalized microvascular thrombosis to sepsis-induced tissue injury.
- To explore the role of microvascular thrombosis in organ failure and mortality during sepsis.
- To identify potential therapeutic targets for sepsis-related tissue injury.
Main Methods:
- Review of existing literature on sepsis, inflammation, and microvascular thrombosis.
- Analysis of post-mortem studies in septic patients.
- Examination of human and animal model studies of sepsis therapies.
Main Results:
- Microvascular thrombosis may be an adaptive response to prevent bacterial spread.
- Generalized microvascular thrombosis can lead to extensive tissue ischemia and organ failure.
- Post-mortem studies show correlation between thrombi burden and organ injury.
- Therapies targeting coagulation and fibrinolysis reduce organ failure and mortality in sepsis models.
Conclusions:
- Generalized microvascular thrombosis is strongly implicated in sepsis-induced organ failure and mortality.
- Further research is needed to fully establish the role of microvascular thrombosis.
- Targeting microvascular thrombosis presents a potential therapeutic strategy for sepsis.
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