Enhanced polymorphonuclear leucocyte adhesion after surgical injury

Area of Science:

• Immunology
• Surgical Pathology
• Critical Care Medicine

Background:

• Neutrophil adhesion receptors, such as CD11b, play a role in inflammatory responses.
• Postoperative sepsis remains a significant complication following major surgical resections.
• Understanding neutrophil behavior is crucial for managing postoperative complications.

Purpose of the Study:

• To investigate the association between neutrophil CD11b expression, neutrophil adhesion, and clinical outcomes in patients undergoing major surgery.
• To determine if altered neutrophil function correlates with the development of postoperative sepsis.

Main Methods:

• Laboratory study involving 25 patients undergoing major surgical resections for malignant disease.
• Measurement of neutrophil CD11b expression and functional adhesion using flow cytometry and chromogenic assays.
• Analysis of blood samples collected preoperatively and on postoperative days 1, 3, and 6.

Main Results:

• Whole blood neutrophil CD11b expression significantly increased postoperatively, particularly in patients who developed sepsis.
• Patients with sepsis exhibited significantly higher CD11b expression and functional adhesion compared to uncomplicated cases.
• Stimulated CD11b expression increased postoperatively only in the sepsis group.

Conclusions:

• Major operations lead to increased neutrophil CD11b expression and adhesion.
• Elevated CD11b expression and adhesion in septic patients suggest a pathophysiological role for neutrophils in postoperative sepsis.
• These findings highlight neutrophils as potential contributors to sepsis development and its consequences after major surgery.