Postoperative ileus (POI) is a serious complication after surgery. While it complicates all type of surgery, it is more frequent after abdominal surgery (especially bowel or colorectal surgery).

Many studies aim to reduce the occurence of POI without efficiency. The aim of this study is to assess the efficiency of the vagal stimulation, by the mean of chewing, to reduce the duration of POI.

Inclusion Criteria:

• patients undergoing colorectal surgery or small bowel surgery
• elective or in emergency
• open surgery or laparoscopy
• diagnosis of POI
• indication of fasting or nasogastric tube placement

Exclusion Criteria:

• contra-indication of chewing
• pregnancy

Data will be shared upon reasonable request. Only de-identified data will be shared. Any data collected during the study may be shared. The protocol will be shared initially. Other documents may be shared at a later date upon request (e.g., the CRF to allow a collaborator to select the data they wish to access). The recipients of the data will be researchers. The data will be available for any purpose deemed relevant by the study investigator, based on a protocol provided by the requester, after verification of the obtaining of regulatory approvals, including the favorable opinion of an ethics committee.

The data will be shared after signing a negotiated data transfer agreement ( data access agreement), for the duration specified in the agreement.

The data will be made available via secure transfer (sharing platform approved by the university hospital: BlueFiles or Oodrive).