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The inflammatory response to cardiopulmonary bypass
1Department of Anesthesiology, Emory University School of Medicine, Atlanta, GA 30322, USA.
Insights
The inflammatory response to cardiopulmonary bypass involves complex humoral and cellular interactions, leading to organ dysfunction known as postperfusion syndrome. Understanding these pathways is crucial for developing effective attenuation strategies.
Area of Science:
- Cardiovascular Surgery
- Immunology
- Inflammation Biology
Background:
- Cardiopulmonary bypass (CPB) triggers a systemic inflammatory response.
- This response involves intricate interactions between humoral factors (complement system, cytokines) and cellular components (neutrophils, endothelial cells).
Purpose of the Study:
- To elucidate the mechanisms underlying the inflammatory response to CPB.
- To identify key pathways involved in CPB-induced organ dysfunction (postperfusion syndrome).
Main Methods:
- Review of humoral and cellular mediators of inflammation during CPB.
- Analysis of neutrophil-endothelial cell interactions and adhesion molecule expression.
- Examination of therapeutic strategies targeting the inflammatory cascade.
Main Results:
- Humoral mediators activate cellular components, initiating neutrophil-endothelial cell adherence.
- This adherence leads to neutrophil emigration and tissue damage, causing postperfusion syndrome.
- Multiple triggering pathways complicate the attenuation of this inflammatory response.
Conclusions:
- The inflammatory response to CPB is a multifaceted process involving complex humoral-cellular crosstalk.
- Effective attenuation strategies are challenged by the diverse pathways initiating inflammation.
- Further research is necessary to fully understand and mitigate CPB-induced inflammation.
Abstract:
The inflammatory response to cardiopulmonary bypass is the product of a complex interplay of humoral and cellular components. Contact activation cascades, the complement system, and cytokines comprise the humoral elements and interact in such a way as to propagate their own cascades and to activate the cellular elements. Neutrophils and endothelial cells are the cellular components and become involved after their "activation" by the humoral mediators. Neutrophil-endothelial cell adherence is the initial step of the cellular inflammatory response and is promoted by the expression of specific adhesion molecules on the surfaces of both of these cells leading to the emigration of neutrophils into the extravascular space where they release toxins that damage surrounding tissues. The resulting organ dysfunction produces the clinical picture referred to as the "postperfusion syndrome." Strategies to attenuate this response include the administration of corticosteroids, aprotinin, and anticytokine monoclonal antibodies, as well as various modifications of the bypass circuit. The existence of multiple pathways to trigger this inflammatory response hampers efforts at its attenuation and leaves much investigation to be done as the quest to understand the body's inflammatory response to cardiopulmonary bypass continues.