Ischemic postconditioning promotes left ventricular functional recovery after cardioplegic arrest in an in vivo piglet model of global ischemia reperfusion injury on cardiopulmonary bypass.
J Thorac Cardiovasc Surg
; 142(4): 926-32, 2011 Oct.
Article
in En
| MEDLINE
| ID: mdl-21353252
ABSTRACT
OBJECTIVE:
An in vivo study of piglets on cardiopulmonary bypass was performed to determine whether postconditioning has a cardioprotective effect after cardioplegic arrest in large animals.METHODS:
Eighteen piglets were subjected to 90 minutes of cardioplegic arrest followed by 30 minutes of reperfusion. In 6 animals (control), there was no intervention at reperfusion. In 6 other animals, 6 cycles of unclamping and reclamping for 10 seconds each were done before reperfusion (postconditioning 10), whereas 3 cycles of unclamping and reclamping for 30 seconds each were performed in another 6 piglets (postconditioning 30).RESULTS:
Recovery of left ventricular contractility and diastolic function (percent of preischemic value) was significantly better in both postconditioning groups (contractility 89.2% and 118.2; diastolic function 142.3% and 120.4; in the postconditioning 10 and 30 groups, respectively) compared with the control (contractility 46.1%; diastolic function 218.5%). Recovery of global cardiac function (ventricular function curve analysis) was improved only in the postconditioning 30 group. Troponin-T release during reperfusion was significantly reduced in the postconditioning 10 group compared with all groups (plasma troponin-T was 0.58 ng/mL in postconditioning 10, 1.85 in postconditioning 30, and 2.54 in control). The myocardial lipid peroxide was significantly higher in the control group than in both postconditioning groups after reperfusion (199% vs 112% and 131%).CONCLUSIONS:
Both postconditioning algorisms promoted functional recovery after cardioplegic arrest in a large animal model along with the limitation of lipid peroxidation with or without the reduction of troponin-T release.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Cardiopulmonary Bypass
/
Myocardial Reperfusion Injury
/
Ventricular Function, Left
/
Ischemic Postconditioning
/
Heart Arrest, Induced
/
Myocardial Contraction
Type of study:
Etiology_studies
/
Prognostic_studies
Limits:
Animals
Language:
En
Journal:
J Thorac Cardiovasc Surg
Year:
2011
Document type:
Article
Affiliation country:
Japan