[Effect of intra-abdominal pressure in laparoscopy on intraperitoneal tumor growth and development of trocar metastases. An animal experiment study in the rat model].

The results of the study indicate that elevated pressure during gas incubation in vitro leads to suppression of tumor growth probably due to direct damage of the cells. In vivo, laparoscopy with carbon dioxide and slightly elevated intraperitoneal pressure (5 and 10 mmHg) leads to promotion of intraperitoneal tumor growth while higher pressure (15 mmHg) causes again suppression of intraperitoneal tumor growth. Subcutaneous tumor growth is stimulated by carbon dioxide insufflation in all groups with elevated intraperitoneal pressures. The hypothesis that elevated intraperitoneal pressure might influence the immune system of the tumor host and increase immune suppression after laparoscopy remains theoretically and has to be investigated in further studies.