[Experimental study of myocardial protective effect of cardiac arrest versus beating heart during open heart surgery].
OBJECTIVE
To investigate the myocardial protective effects of beating heart versus heart arrest in goats undergoing open heart surgery with cardiopulmonary bypass (CPB).


METHODS
Eighteen healthy and homologous goats were randomly divided into three groups: groupI (n=6), with intermittent cold crystalloid cardioplegia; group II (n=6), with continuous warm blood cardioplegia; group III (n=6), with beating heart. Animals in group II and group III were operated with mild hypothermic CPB. The changes in malondialdehyde (MDA) in the myocardium of the right ventricles and atrial natriuretic peptide (ANP) in venous blood were measured respectively. The myocardial tissues were examined for ultrastructural changes.


RESULTS
In group I, contents of MDA and ANP rose significantly during CPB, especially when blood was reperfused routinely. While in group II and group III, the levels were lower than those in group I at the same time points. There was no difference in the values between group II and group III. Ultrastructural changes were distinctly seen in group I, while they were mild in group II and group III.


CONCLUSIONS
Continuous warm blood cardioplegia to keep the heart beating during operation can prevent ischemia-reperfusion injury and protect heart better.
Song
Jian-fei
JF
Department of Cardiothoracic Surgery, Affiliated Hospital, Guilin Medical College, Guilin 541001, Guangxi, China.
Liang
Yue-pei
YP
Li
An-gui
AG
Du
Zhen-zong
ZZ
Zheng
Min
M
Lin
Feng
F
Hu
Chang-fu
CF
D000818:Animals; D002314:Cardioplegic Solutions; D002315:Cardiopulmonary Bypass / Q000379:methods*; D006041:Goats; D006324:Heart Arrest, Induced / Q000379:methods*; D009200:Myocardial Contraction; D015428:Myocardial Reperfusion Injury / Q000517:prevention & control*
D002314:Cardioplegic Solutions