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Immune response to laparoscopic bowel injury
Joel Patrick A Aldana1, Robert Marcovich, Pravin Singhal
1Department of Urology, Long Island Jewish Medical Center, New Hyde Park, New York, USA.
Journal of Endourology
|July 30, 2003
Summary
Laparoscopic bowel injury causes a delayed immune response, with lower apoptosis in immune cells compared to open surgery. This immune response difference may be due to less immune stimulation during laparoscopic procedures.
Area of Science:
- Immunology
- Surgical Pathology
- Cellular Biology
Background:
- Laparoscopic bowel injuries are rare but can be fatal if not recognized promptly.
- Unrecognized laparoscopic bowel injuries do not present with typical signs of acute surgical abdomen, unlike open surgery injuries.
- Investigating immune cell apoptosis (programmed cell death) can indicate the body's response to surgical trauma.
Purpose of the Study:
- To compare the immune response, specifically monocyte, neutrophil, and lymphocyte apoptosis, after laparoscopic versus open bowel injury.
- To determine if laparoscopic bowel injury stimulates or suppresses the immune response differently than open bowel injury.
- To assess apoptosis as a potential indicator of delayed recognition in laparoscopic bowel injury.
Main Methods:
- A rabbit model was used to create laparoscopic and open bowel injuries.
- Animals were divided into four groups: control, laparoscopic injury at 1 hour, laparoscopic injury at 5 hours, and open surgery injury.
- Blood samples were collected at various time points (0, 1 day, 1 week, 2 weeks) to assess apoptosis using fluorescent dye staining.
Main Results:
- Neutrophil, monocyte, and lymphocyte apoptosis were significantly lower (2.4- to 5-fold) at 1 week after 1-hour laparoscopic injury compared to open surgery.
- Apoptosis levels equalized between laparoscopic and open surgery groups by 2 weeks.
- Longer laparoscopic procedures (5 hours) showed apoptosis levels closer to open surgery results at early time points (0 and 1 day).
- All experimental groups showed significantly different apoptosis levels compared to controls at 2 weeks (P < 0.001).
- Survival was compromised in the 5-hour open surgery group, with no animals surviving to 2 weeks.
Conclusions:
- Open surgery induced a significant increase in programmed cell death (apoptosis) in the immediate postoperative period following bowel injury.
- Laparoscopic surgery resulted in a delayed apoptotic response, with levels approaching those of open surgery by 2 weeks post-injury.
- The observed differences in cellular death suggest a potentially lesser degree of immune system stimulation with laparoscopic surgery compared to open surgery.