title: Effect of limb ischemic preconditioning on myocardial injury in patients undergoing mitral valve replacement surgery. -A randomized controlled trial-.
abstract: BACKGROUND
  Whether limb ischemic preconditioning (LIPC) is beneficial for patients undergoing mitral valve replacement (MVR) surgery is unknown.
  
  
  RESULTS
  Seventy-five adult patients undergoing MVR surgery were randomly assigned to 3 groups: control group (n=25), LIPC group I (3 × 5-min cycles of right upper arm ischemia and 5-min reperfusion; n=25) and LIPC group II (3 × 5-min cycles of right upper arm ischemia and 5-min reperfusion combined with 2 × 10-min cycles of right upper leg ischemia and 10-min reperfusion; n=25). Cardiopulmonary bypass (CPB) time, cross-clamp time, cardiac index, cumulative postoperative dosage of dobutamine, intensive care stay, postoperative hospital stay were not statistically different. Although the cumulative postoperative dosage of dobutamine was not different, there was a significantly lower inotropic requirement in LIPC II compared with the control group at 4 and 8h after surgery. Plasma levels of cardiac troponin-I in the 3 groups significantly increased during CPB and peaked at 4h after surgery. Levels of cTnI in LIPC II were significantly lower than in the control group at each time point after surgery.
  
  
  CONCLUSIONS
  Myocardial injury is obvious after MVR surgery. LIPC can protect the myocardium from ischemia-reperfusion injury and decrease the inotropic requirement after surgery. The data also confirmed the requirement for the preconditioning stimulus to cross a threshold.
authors.affiliation: Department of Anesthesiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
authors.forename: Qingping
authors.initials: Q
authors.lastname: Wu
authors.forename: Ping
authors.initials: P
authors.lastname: Gui
authors.forename: Jing
authors.initials: J
authors.lastname: Wu
authors.forename: Defang
authors.initials: D
authors.lastname: Ding
authors.forename: Gunsham
authors.initials: G
authors.lastname: Purusram
authors.forename: Nianguo
authors.initials: N
authors.lastname: Dong
authors.forename: Shanglong
authors.initials: S
authors.lastname: Yao
mesh_terms: D058665:Adrenergic beta-1 Receptor Agonists / Q000008:administration & dosage; D000328:Adult; D001132:Arm / Q000098:blood supply*; D006348:Cardiac Surgical Procedures / Q000009:adverse effects / Q000379:methods*; D002315:Cardiopulmonary Bypass; D004280:Dobutamine / Q000008:administration & dosage; D005260:Female; D006335:Heart Injuries / Q000097:blood / Q000209:etiology / Q000517:prevention & control*; D006801:Humans; D019194:Ischemic Preconditioning / Q000379:methods*; D007866:Leg / Q000098:blood supply*; D008297:Male; D008875:Middle Aged; D008943:Mitral Valve / Q000601:surgery*; D009206:Myocardium; D011183:Postoperative Complications / Q000097:blood / Q000209:etiology / Q000517:prevention & control*; D011446:Prospective Studies; D013997:Time Factors; D019210:Troponin I / Q000097:blood
chemical_list: D058665:Adrenergic beta-1 Receptor Agonists; D019210:Troponin I; D004280:Dobutamine