Does umbilical contamination correlate with colorectal surgery patient outcomes?

Effects of Umbilical Preparation Before Trans-umbilical Laparo-endoscopic Single-site Surgery on Umbilical Wounds Healing: a Randomized Controlled Trial

OBJECTIVE

The umbilicus is the only anatomic entrance and incision site for trans-umbilical laparoendoscopic single-site surgery (TU-LESS). Data on incisional surgical site infections (ISSI) and incision healing in TU-LESS are lacking. Therefore, we aimed to observe umbilical incision healing and possible hernia after TU-LESS and explore the efficacy of preoperative umbilicus preparation on ISSI.

SUBJECTS AND METHODS

Consecutive patients aged 18 to 65 years, who were scheduled to undergo TU-LESS at a teaching hospital between March 2020 and November 2021, were enrolled in this prospective study. All patients were randomized to the study group with preoperative umbilicus preparation 30 minutes before patients were sent to the operating room and to the control group without preparation. The umbilical dimple was disinfected twice using povidone-iodine in both groups before the skin incision. The primary outcome was ISSI within 30 days of surgery. Umbilical hernia at 3 months after surgery and perioperative data such as operation time, complications, and incision healing were recorded and compared.

RESULTS

A total of 400 patients were recruited for this study. TU-LESS was performed in all patients without major complications. ISSI occurred in 5 patients in the study group (2.5%) and 3 patients in the control group (1.5%), with no significant differences between both groups ( P =0.479). No umbilical hernia occurred in any patient during the 3 months follow-up. Six patients in the study group (3.1%) and 1 in the control group (0.5%) experienced excessive scarring, a relatively high incidence in the study group, though the difference was not statistically significant ( P =0.067).

CONCLUSIONS

TU-LESS-related umbilical hernias are rare with existing suturing methods. Umbilicus preparation before TU-LESS could not decrease ISSI; however, it increased the nursing workload, which should be avoided.

A pilot randomised controlled trial of patient education to improve umbilical cleanliness prior to laparoscopic surgery

BACKGROUND

Before laparoscopic abdominal surgery, surgeons frequently remove debris from patients' umbilici to prevent it from passing into the abdomen and optimise skin antisepsis. This task irritates the skin, takes time and contaminates sterile equipment. This pilot randomised controlled trial aimed to inform a definitive study investigating whether patient education improves umbilical cleanliness in these patients.

METHODS

To generate data on effect size and sample size, adult patients undergoing elective and emergency laparoscopic abdominal surgery were randomised to an intervention group, who received an education pack to clean their umbilicus prior to surgery, or a control group, who received no pack. Umbilical cleanliness was measured using a novel scale. To assess scale validity and reliability, all umbilici were scored by nine surgeons and surgical trainees using photographs and umbilici were swabbed to estimate bacterial load. Intervention acceptability was assessed via study consent and withdrawal rates and trial feasibility was evaluated using qualitative insights documented by investigators.

RESULTS

Seventy-one percent (22/31) of the intervention group had clean umbilici versus 61% (19/31) in the control group. A definitive trial would require 712 participants to show statistical significance between study groups. The umbilical cleanliness scale had excellent interrater and test-retest reliability and a moderate degree of convergent validity with respect to bacterial load. The intervention was highly acceptable to participants, and theatre nurses and surgical trainees were central to trial feasibility.

CONCLUSION

A definitive trial is warranted and would contribute to an evidence-based, standardised approach to preoperative care. Trial registration no. ACTRN12620000278932.