“…Pneumoperitoneum has been described as ''adequate'', ''appropriate'' or ''sufficient,'' established by an arbitrary volume of 1-4 L of CO 2 without regard to intra-abdominal pressure. Final pressures of 10 mmHg [33], 15 mmHg [20,29,34], 14-18 mmHg [35], 20 mmHg [26,36], 25 mmHg [21,27,[36][37][38][39], and 30 mmHg [22,40] have been advocated [8]. To determine the most appropriate pressure Phillips et al measured the vertical depth of pneumoperitoneum at the umbilicus in 43 women undergoing laparoscopy when volume and pressure of insufflated CO 2 varied [37,41].…”