[Does temperature in extracorporeal circulation affect neutrophil-endothelium interactions?]

Area of Science:

• Cardiovascular Surgery
• Immunology
• Inflammation Biology

Context:

• Warm aerobic cardioplegia is gaining interest, necessitating a review of normothermic cardiopulmonary bypass (CPB) effects.
• Neutrophils mediate inflammatory responses during CPB through cytotoxic product release.
• Understanding temperature's influence on neutrophil-endothelial interactions is crucial for optimizing CPB strategies.

Purpose:

• To investigate the impact of warm versus cold CPB on neutrophil-endothelial interactions.
• To analyze inflammatory markers, adhesion molecule expression, and neutrophil migration during CPB at different temperatures.

Summary:

• This study compared neutrophil-endothelial interactions during warm (31-33.5°C) and cold (26-27°C) CPB in 95 patients.
• Markers analyzed included complement activation (C3a), cytokines (TNF-α, IL-1, IL-6, IL-8, IL-1RA), adhesion molecules (ICAM, P-selectin), neutrophil surface molecules (CD11a/b/c), and neutrophil migration indicators (IL-8, elastase).
• Results indicated that CPB induced transendothelial adhesion and migration regardless of temperature, but normothermia significantly amplified the inflammatory response.

Impact:

• Normothermia during CPB exacerbates the inflammatory response, characterized by increased cytokine production and earlier neutrophil activation.
• Findings highlight the need to carefully manage temperature during CPB to mitigate inflammatory complications.
• This research provides critical insights for refining CPB protocols to improve patient outcomes in cardiac surgery.