The modulation of immune responses by CO2, but not helium pneumoperitoneum, has a significant positive impact on survival during abdominal sepsis in a mouse model. Thus, application of a CO2 pneumoperitoneum may be beneficial in conditions with bacterial contamination of the abdominal cavity.
CO(2) pneumoperitoneum increased intrahepatic metastasis, but not local peritoneal carcinosis in a murine neuroblastoma model. This suggests that laparoscopy could promote systemic dissemination of intraperitoneally spilled tumor cells when no chemotherapy is applied. It remains to be determined whether this is due to local immune suppression or direct modulation of tumor cell behavior.
In this study children experienced less pain after 60 min application time, but pain reduction was already seen after 40 min. The child's perception of pain differed from observers' point of view and should therefore always be included in pain management.
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