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Circulating and exudative polymorphonuclear neutrophil priming and oxidative capacity in anergic surgical patients
1Department of Surgery, McGill University, Montreal, Quebec.
Objectives:
To examine the oxidative capacity of circulating and exudate polymorphonuclear neutrophils from reactive patients and anergic patients before surgery to determine why anergic patients have increased sepsis-related mortality once an infectious complication develops.
Design:
Prospective in vitro patient study.
Setting:
Tertiary care, major university teaching hospital.
Participants:
Surgical patients admitted for major elective gastrointestinal surgery.
Main Outcome And Measures:
We used flow cytometry and the dye 2-7-dichlorofluorescein diacetate to measure hydrogen peroxide production of circulating and exudate polymorphonuclear neutrophils at baseline and after stimulation with Staphylococcus epidermidis.
Results:
We found that polymorphonuclear neutrophils were primed in the intravascular space as evidenced by increased numbers of formyl-methionyl-leucyl-phenylalanine receptors, increased hydrogen peroxide production at baseline, and increased hydrogen peroxide production with stimulation. These results were more evident in the anergic patient. After exudation, anergic polymorphonuclear neutrophils lost most of their capacity to produce additional hydrogen peroxide.
Conclusions:
The data suggest that this intravascular priming adversely affected polymorphonuclear neutrophils during exudation, more marked in the anergic patient, and may contribute to the sepsis-related mortality of the anergic patients.