The effect of initial lower PO_2 controlled reperfusion on cyanotic hypoxic immature myocardial protection
- VernacularTitle:低氧分压控制性再灌注与紫绀缺氧未成熟心肌保护
- Author:
Jianping YAO
;
Xi ZHANG
;
Yingqi XU
- Publication Type:Journal Article
- Keywords:
Myocardium Myocardial reperfusion injury Anoxia Free radicals
- From:Chinese Journal of Thoracic and Cardiovascular Surgery
1995;0(05):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective: To explore the effect of initial lower PO_2 controlled reperfusion on cyanotic hypoxic immature myocardium protective during post-ischemia reperfusion. Methods: 24 hypoxic neonatal rabbits were randomized into 3 groups (8 in each group). Group I (initial lower PO_2 controlled reperfusion), group II (normal PO_2 controlled reperfusion), group III (high PO_2 reperfusion group). Using isolate heart Langendorff ischemia-reperfusion model, the myocardial protection results were observed and the mechanism were discussed from molecular biological and ultrastructural view. Results: Compared with high PO_2 reperfusion group and normal PO_2 reperfusion group, the products of oxygen free radical were lowered at the end of reperfusion in initial lower PO_2 controlled reperfusion group. ATP content was increased, myocardial contractility was elevated, coronary sinus flow was raised, the degree of myocardium edema was reduced, and ultrastructure alteration was lessened significantly. Conclusion: Initial lower PO_2 controlled reperfusion reduces oxygen free radical injury, enhances myocardial energy metabolism, lessens myocytic structure destruction and improves postischemic function recovery of cyanotic myocardium.
