Results:
The mean age of the groups was 37.35 ± 10.91 years, and the mean BMI was 44.70 ± 4.37 kg/m2. While 17.5% of the patients had a history of operation, 82.5% had not previously undergone surgery. The mean duration of exposure to IAP was 85.18 ± 27.1 minutes, while the mean duration of hospital stay was 5.98 ± 1.23 days (Table 1). Preoperative and postoperative kidney and liver function values ​​of the patients were within the reference range in both groups (Table 2). There was no statistically significant difference between the groups in terms of age, BMI, duration of exposure to pressure, and length of hospital stay (p > 0.05) (Table 3). The direct bilirubin value measured at the sixth hour was significantly higher in the 10 mmHg pressure group compared to the 13 mmHg group (p < 0.05), but there was no significant difference in terms of the mean measurement of the remaining blood parameters ​​(p > 0.05) (Table 4).
In both groups, while there was a significant decrease in the IJV diameter and flow measurement values ​​at t2 compared to t1, a significant increase was observed at t3 compared to t2 (p < 0.05). In addition, at all measurement times, the IJV diameter and flow measurement averages were significantly higher in the 10 mmHg pressure group compared to the 13 mmHg group (p < 0.05) (Table 5). In the latter, as BMI increased, the IJV diameter (cm) measured at t1 and t3 significantly decreased compared to t2 (p <0.05), and when the duration of exposure to pressure (min) increased, the IJV flow values (mm/sec) measured at t1 and t3 were significantly higher compared to t2 (p < 0.05) (Table 6).