Surgery is one of the most frequent treatments of colorectal cancer. However, delayed restoration of intestinal motility is a common phenomenon in patients who undergo colorectal surgery, and may reduce comfort, prevent the early hospital discharge of patients and increase healthcare costs. Gum chewing is a kind of safe and easily accessible sham feeding to stimulate intestinal motility. In addition, prediction models were used to estimate the risk of delayed restoration of intestinal motility after colorectal surgery. Thus, this study is an External Controlled trial that will determine whether stratified application of gum chewing by risk prediction model will enhance restoration of intestinal motility and reduce healthcare costs in paitents undergoing open or laparoscopic colorectal surgery.

Background:

Identifying patients at high risk of delayed restoration of intestinal motility at an early stage and adopting individualized interventions is crucial. The risk prediction model can provide a highly accurate, individualized evidence-based risk estimation by identifying risk factors and creating a risk stratification system. In addition, gum chewing is a kind of sham feeding that has been reported to stimulate intestinal motility and emerged as a popular, simple, safe, effective method for enhancing restoration intestinal motility. Thus, this study combines risk prediction model and gum chewing, aiming to use pre- and intraoperative risk factors to predict the risk of delayed restoration of intestinal motility. After creating a risk stratification system, patients with colorectal surgery will be stratified to high-risk group or low-risk group of delayed restoration of intestinal motility.

Objective:

To compare the efficacy and economics of gum chewing in patients undergoing open or laparoscopic colorectal surgery after stratification by a risk prediction model.

Design:

This is a single-center, two-arm, prospective study and non-randomized external controlled trial.

Subjects:

Two hundred and ninety-two consecutive patients undergoing open or laparoscopic colorectal surgery will be recruited in experiment group, which includes high-risk group and low-risk group.

Interventions:

The low-risk group will only receive enhanced recovery care and the high-risk group will be instructed to chew gum as well as receive enhanced recovery care. The enhanced recovery care consists of no administration of intestinal antibiotics and normal diet until 6 hours before surgery; no nasogastric drainage and minimal perioperative introvenous fluid on the day of surgery; patients start to ambulate and drink water on the first postoperative day. Patients in high-risk group are instructed to chew the piece of sugar-free gum three times (at least 10 minutes) a day from the first postoperative morning until oral dietary intake.

Outcome measures:

The outcomes are first flatus time、first defecation time、Proportion of delayed restoration of intestinal motility、length of hospital stay. All the patients will be assisted to fill in "Patient Log" about the first flatus time and first defecation time after surgery until the oral dietary intake.

Inclusion Criteria:

• Patients with newly diagnosed colorectal cancer
• Undergo open or laparoscopic colorectal surgery
• Able to give informed consent
• With normal verbal skills

Exclusion Criteria:

• Preoperative lower extremity dysfunction
• Dysphagia before surgery
• Patients who are discharged ,transferred to another hospital or die within 72
• hours after surgery