[Effects of different oxygen flow rates on myocardial ischemia-reperfusion injury in rabbits].
OBJECTIVE
To explore the effects of different oxygen flow rates during cardiopulmonary bypass (CPB) on myocardial ischemia-reperfusion (IR) injury in rabbits.


METHODS
Thirty rabbits were randomized equally into groups A, B and C to receive controlled oxygen reperfusion at low, normal and high flow rates (25, 50, and 80 ml.kg(-1).min(-1), respectively). Serum concentration of CK-MB and cTnT were tested by ELISA before the operation (T0) and after 30 min (T1), 2 h (T2), 12 h (T3) and 24 h (T4) of reperfusion. W/D, SOD and MDA of the myocardium were determined before and at 60 min after reperfusion. The ultrastructural alterations of the myocardium were observed.


RESULTS
Serum concentration of CK-MB and cTnT in the 3 groups increased significantly after the operation, and their levels were the lowest in group A (P<0.05). W/D and MDA in the myocardium was also the lowest, while SOD the highest in group A (P<0.05). Ultrastructural pathologies were found in all the 3 groups, but relatively mild in group A.


CONCLUSIONS
Low oxygen flow rate during controlled reperfusion may protect the myocardium from IR injury in rabbits.
Gong
Wei
W
Department of Cardiothoracic Surgery, Third Xiangya Hospital of Central South University, Changsha 410013, China. gongwei21star@sohu.com
Liu
Jian-Xin
JX
Jin
Long-Yu
LY
Wang
Dian-Jun
DJ
Hong
Chao
C
Jiang
Zhi-Bin
ZB
D000818:Animals; D002315:Cardiopulmonary Bypass; D015428:Myocardial Reperfusion Injury / Q000517:prevention & control*; D010100:Oxygen / Q000008:administration & dosage*; D011817:Rabbits; D015424:Reperfusion / Q000379:methods*
D010100:Oxygen