Clinical study predicting prolonged postoperative ileus after laparoscopic colorectal cancer surgery with intelligent bowel sound auscultation system

Figure 4 Comparison chart of bowel sounds indicators on the first postoperative day among different groups of patients. A: Comparison of number of bowel sounds differences on the first postoperative day, with significant differences between the prolonged postoperative ileus (PPOI) group and the no-PPOI group as well as the blank control group; B: Comparison of recovery time of bowel sounds differences, with significant differences between the PPOI group and the no-PPOI group; C: Comparison of FBS differences on the first postoperative day, with no significant differences among the PPOI group, no-PPOI group, and blank control group; D: Comparison of bowel sound vibration amplitude differences on the first postoperative day, with no statistical significance between the PPOI group and the no-PPOI group, but significant differences between the PPOI group and no-PPOI group compared to the blank control group. ^aP < 0.01; ^bP < 0.0001. NBS: Number of bowel sounds; cpm: Counts per minute; RTBS: Recovery time of bowel sounds; FBS: Frequency of bowel sounds; BSVA: Bowel sound vibration amplitude; PPOI: Prolonged postoperative ileus.