Influence of pneumoperitoneum pressure on surgical field during robotic and laparoscopic surgery: a comparative study

Studies on the influence of CO2 pneumoperitoneum on the abdominal cavity during robotic procedures are lacking. This is the first study to evaluate surgical field modifications related to CO2 pressure, during laparoscopic and robotic surgery. Consecutive patients scheduled for laparoscopic or robotic hysterectomy were enrolled in the study. To evaluate the level of operative field visualization, a dedicated form has been designed based on the evaluation of four different areas: Douglas space, vesico-uterine fold and, bilaterally, the broad ligament. During the initial inspection, an assistant randomly set the CO2 pressure at 15, 10 and 5 mmHg, and the surgeon, not aware of the CO2 values, was asked to give an evaluation of the four areas for each set pressure. In laparoscopic group, CO2 pressure significantly influenced the surgical field visualization in all four areas analyzed. The surgeon had a good visualization only at 15 mmHg CO2 pressure; visualization decreased with a statistically significant difference from 15 to 5, 15-10 and 10-5 mmHg. In robotic group, influence of CO2 pressure on surgical areas visualization was not straightforward; operative field visualization remained stable at any pressure value with no significant difference. Pneumoperitoneum pressure significantly affects the visualization of the abdomino-pelvic cavity in laparoscopic procedures. Otherwise, CO2 pressure does not affect the visualization of surgical field during robotic surgery. These findings are particularly significant especially at low CO2 pressure with potential implications on peritoneal environment and the subsequent post-operative patient recovery.