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[Physiopathological alterations secondary to extracorporeal circulation in cardiac surgery]
A Gabriela Valenzuela-Flores1, Adriana Abigail Valenzuela-Flores, J Alberto Ortega-Ramírez
1Servicio de Medicina Nuclear, Hospital de Cardiología, Centro Médico Nacional Siglo XXI, Instituto Mexicano de Seguro Social. almavale@terra.com.mx
Insights
Cardiopulmonary bypass (CPB) triggers a systemic inflammatory response, potentially leading to organ dysfunction and affecting long-term survival. Understanding these inflammatory mechanisms is crucial for improving patient outcomes after cardiac surgery.
Area of Science:
- Cardiovascular Surgery
- Immunology
- Critical Care Medicine
Background:
- Cardiopulmonary bypass (CPB) is essential for myocardial revascularization but is linked to significant morbidity and mortality.
- CPB initiates a systemic inflammatory response (SIRS) involving tissue injury, cellular changes, and mediator release.
- Key triggers for SIRS during CPB include foreign surface contact, ischemia-reperfusion injury, and endotoxemia.
Purpose of the Study:
- To review and elucidate the pathological mechanisms underlying the inflammatory response following cardiopulmonary bypass.
- To provide a comprehensive understanding of how CPB induces SIRS and its associated complications.
Main Methods:
- Literature review of pathological mechanisms of inflammatory response after CPB.
- Analysis of factors contributing to SIRS during cardiac surgery with CPB.
- Examination of the relationship between SIRS and postoperative organ dysfunction.
Main Results:
- CPB activates a complex inflammatory cascade involving multiple pathways.
- Ischemia-reperfusion injury, foreign surface interaction, and endotoxemia are concurrent contributors to SIRS.
- SIRS is associated with acute lung injury, shock, renal failure, and multiple organ dysfunction syndrome.
Conclusions:
- The inflammatory response to CPB is a significant factor in postoperative complications and long-term survival.
- Further research into mitigating CPB-induced inflammation is warranted to improve patient outcomes.
- Understanding these mechanisms is vital for developing targeted therapeutic strategies.
Abstract:
Cardiopulmonary bypass (CPB) is one of the methods used in myocardial revascularization and can be associated with adverse events that are uncommon, but CPB induces high morbidity and mortality. Cardiac surgery and CPB activate a systemic inflammatory response characterized by tissular lesions, cells movements and blood flow toward the interstice where the harmful stimulus has begun, under the influence of the mediators. The systemic inflammatory response may be initiated during cardiac surgery by a number of processes, including blood contact with the foreign surface of the CPB apparatus, development of ischemia and reperfusion injury, and presence of endotoxemia. In the course of cardiac surgery using CPB, all three processes are present and contribute concurrently to the systemic inflammatory response. The term "systemic inflammatory response syndrome" (SIRS) has been proposed to describe an entity that continually overlaps with normal postoperative physiology. A frequent complication of SIRS is the development of organ dysfunction, including acute lung injury, shock, renal failure, and multiple organ dysfunction syndrome. Finally, long-term survival in patients developing SIRS may also be adversely affected. The purpose of this review is to examine and understand the pathological mechanisms for inflammatory response that occur following cardiopulmonary bypass.
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