title: The influence of laparoscopic surgery on postoperative polymorphonuclear leukocyte function.
abstract: BACKGROUND
  Laparoscopic surgery is thought to result in a better preservation of patients' immunological defenses. Polymorphonuclear leukocytes (PMN) are the most important effector cells in the elimination of pathogenic microorganisms. Because little is known about their function after laparoscopic surgery, we studied PMN phagocytosis, antigen expression, and oxygen radical production.
  
  
  METHODS
  In this study, 17 patients scheduled for Nissen fundoplication were randomly assigned to undergo either a laparoscopic or conventional procedure. To study phagocytic capacity, PMN were incubated with fluorescein isothiocyanate (FITC)-labeled Staphylococcus aureus. Plasma opsonic capacity was measured by comparing PMN phagocytosis in the presence of patients' own plasma with phagocytosis in the presence of control plasma. Cellular activation was measured by the expression of various cell surface markers and by assessment of PMA-stimulated oxidative burst.
  
  
  RESULTS
  Phagocytosis by PMN in the presence of patients' plasma was significantly lower 2 h after the conventional operation. No decrease in phagocytosis was observed when control plasma was used, indicating a decreased opsonic capacity of plasma after conventional surgery. No changes were observed after laparoscopic surgery. Furthermore, CD11b expression was significantly lower after the laparoscopic approach, indicating a blunted cellular activation. A significantly lower PMA-stimulated oxidative burst further confirmed the tempered stimulation after laparoscopic surgery.
  
  
  CONCLUSIONS
  Laparoscopic surgery results in a preservation of the plasma opsonic capacity, and thereby the ability of PMN to phagocytose bacteria. Moreover, the postoperative cellular activation is reduced. The preserved phagocytosis and the blunted activation may prevent the development of postoperative infectious complications.
authors.affiliation: Department of Surgery, Academic Hospital Vrije Universiteit, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands.
authors.forename: C
authors.initials: C
authors.lastname: Sietses
authors.forename: M J
authors.initials: MJ
authors.lastname: Wiezer
authors.forename: Q A
authors.initials: QA
authors.lastname: Eijsbouts
authors.forename: P A
authors.initials: PA
authors.lastname: van Leeuwen
authors.forename: R H
authors.initials: RH
authors.lastname: Beelen
authors.forename: S
authors.initials: S
authors.lastname: Meijer
authors.forename: M A
authors.initials: MA
authors.lastname: Cuesta
mesh_terms: D000328:Adult; D005260:Female; D018662:Fundoplication / Q000379:methods; D005764:Gastroesophageal Reflux / Q000601:surgery; D006801:Humans; D010535:Laparoscopy; D008297:Male; D008875:Middle Aged; D009504:Neutrophils / Q000502:physiology*; D009895:Opsonin Proteins / Q000097:blood*; D010587:Phagocytosis; D011184:Postoperative Period; D016897:Respiratory Burst
chemical_list: D009895:Opsonin Proteins