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Immunological effects of laparoscopic vs open colorectal surgery: a prospective clinical study
Matthias W Wichmann1, Thomas P Hüttl, Hauke Winter
1Department of Surgery, Ludwig-Maximilians University, Klinikum Grosshadern, Munich, Germany. Matthias.Wichmann@med.uni-muenchen.de
Insights
Laparoscopic colorectal surgery shows a reduced inflammatory response and higher natural killer cell counts compared to open surgery. Specific immunity is similarly affected by both methods, suggesting a less pronounced proinflammatory impact from minimally invasive approaches.
Area of Science:
- Immunology
- Surgical Oncology
- Minimally Invasive Surgery
Background:
- Laparoscopic surgery is increasingly used for colorectal diseases.
- Previous studies suggest better immune preservation with laparoscopy versus conventional surgery.
- The differential impact on specific and nonspecific immunity remains unclear.
Purpose of the Study:
- To investigate the hypothesis that laparoscopic and conventional colorectal surgery differentially affect specific and nonspecific immunity.
- To compare the inflammatory and cellular immune responses between laparoscopic and open colorectal surgery.
Main Methods:
- A nonrandomized control trial involving 70 patients undergoing laparoscopic or open colorectal surgery.
- Blood samples collected pre-surgery and on postoperative days 1, 3, and 5.
- Flow cytometry for lymphocyte subpopulations and natural killer cells; serum analysis for interleukin-6 and C-reactive protein.
Main Results:
- Laparoscopic surgery resulted in significantly lower interleukin-6 and C-reactive protein levels, indicating a reduced proinflammatory response.
- Postoperative natural killer cell counts were significantly higher in the laparoscopic group.
- No significant differences were observed in B lymphocyte, T lymphocyte, helper T-cell, or cytotoxic T-cell counts between the groups.
Conclusions:
- Minimally invasive laparoscopic surgery leads to a less pronounced proinflammatory response to surgical trauma compared to open surgery.
- Nonspecific immunity (e.g., natural killer cells) is less affected by laparoscopic surgery.
- Specific cell-mediated immunity is affected similarly by both laparoscopic and open colorectal surgery, a novel finding with clinical implications.
Hypothesis:
Laparoscopy has become a popular approach for the surgical treatment of benign and even malignant colorectal diseases. Several authors have reported better preserved immunity in patients undergoing laparoscopic compared with conventional colorectal surgery. The present study addresses the hypothesis that specific and nonspecific immunity are differently affected by laparoscopic and conventional colorectal surgery.
Design:
Nonrandomized control trial.
Setting:
University hospital.
Patients:
Seventy prospectively enrolled patients with colorectal diseases undergoing laparoscopic (n = 35) or open (n = 35) surgery.
Main Outcome Measures:
Blood samples were taken prior to surgery as well as on days 1, 3, and 5 after surgery. Cell numbers of lymphocyte subpopulations as well as natural killer cells were determined by flow cytometry, and interleukin 6 and C-reactive protein serum levels were measured.
Results:
Significant differences between study and control patients (P<.05) were detected regarding circulating interleukin 6 and C-reactive protein levels with a reduced proinflammatory response to surgery in patients after laparoscopic surgery. Furthermore, postoperative natural killer cell counts were significantly higher in patients after laparoscopic surgery. The levels of B lymphocytes and T lymphocytes and helper T-cell counts and cytotoxic (suppressor) T-cell counts did not show significant differences after open or laparoscopic surgery.
Conclusions:
Our findings indicate a less pronounced proinflammatory response to surgical trauma in patients after minimally invasive surgery. The nonspecific immune response appears to be less affected by laparoscopic surgery when compared with open surgery while the specific cell-mediated immunity is equally affected. These findings are important because a divergent effect on specific and nonspecific immunity of laparoscopic surgery for colorectal disease has not been reported before.
