Limb Remote Ischemic Preconditioning for Heart and Intestinal Protection During Laparoscopic Colorectal Surgery

Remote ischaemic preconditioning may confer the cytoprotection in critical organs. The investigators hypothesized that limb remote ischemic preconditioning (RIPC) would reduce heart and gastrointestinal function injury in middle-aged and elderly patients undergoing elective laparoscopic colorectal surgery.

Inclusion Criteria:

• age >40 years old
• ASA I-II
• receive elective laparoscopic colorectal surgery
• written informed consent can be obtained

Exclusion Criteria:

• coagulation disorders
• patients with cardiac pacemaker
• patients with severe cardiac,or pulmonary,hepatic,renal disease ,or can not tolerate laparoscopic surgery
• patients with peripheral vascular disease affecting the upper limbs
• patients with mental,or hearing, vision disorder, who is not able to communicate with physicians
• difficult airways that can not receive rapid induction