Hyperglycaemia is a risk factor for complications and should therefore be avoided. Several interventions in the ERAS protocol prevent insulin resistance, thereby improving glycaemic control with no risk of causing hypoglycaemia. For in patients, insulin should be used judiciously to maintain blood glucose as low as feasible with the available resources. 1：Using stress-reducing elements of ERAS to minimise hyperglycaemia.(Quality of evidence: Moderate ；Recommendation grade: Strong） 2：Insulin treatment in the ICU（Quality of evidence: Moderate ；Recommendation grade: Insulin treatment in the ICU (severe hyperglycaemia):Strong；Insulin treatment in the ICU (mild hyperglycaemia):Weak） 3：Glycaemic control (using insulin) in the ward setting（Quality of evidence: Low ；Recommendation grade:Weak）

Mechanical bowel preparation alone with systemic antibiotic prophylaxis has no clinical advantage and can cause dehydration and discomfort and should not be used routinely in colonic surgery, but may be used for rectal surgery（Quality of evidence: High ；Recommendation grade: Strong）. There is some evidence from randomized controlled trials to support the use of a combination of MBP and oral antibiotics over MBP alone（Quality of evidence: Moderate ；Recommendation grade: Weak）.

In low-risk patients, we suggest the use of mechanical prophylaxis using IPC.（Evidence level:Low；Recommendation grade:Weak）

In patients undergoing AAA repair, particularly when an open surgical approach is used, the risk of VTE is higher with a high bleeding risk. These patients should be considered as having a moderate risk. Patients with additional risk factors including BMI at least 30 kgm_x005f2, preoperative dyspnoea, chronic steroid usage, ruptured aneurysm, open surgery, operative duration at least 5 h, transfusion of at least 5 U, postoperative mechanical ventilation more than 48 h, postoperative complication (acute kidney injury, infection/sepsis) and re-operation, should be considered as moderate-to-high risk. In this context, we suggest the use of pharmacological prophylaxis as soon as satisfactory haemostasis is achieved（Evidence level:Low；Recommendation grade:Weak）

Patients undergoing peripheral vascular surgery are considered to have a low risk of VTE and low risk of bleeding. Stringent medical prophylaxis appears to reduce the event rate significantly. In this population, we suggest medical therapy.（Evidence level:Low；Recommendation grade:Weak）