[Experimental study of cerebral protection by retrograde vs selective antegrade cerebral perfusion during deep hypothermic circulatory arrest].
OBJECTIVE
To compare the effect of cerebral protection between retrograde cerebral perfusion (RCP) and selective antegrade cerebral perfusion (SACP) during deep hypothermic circulatory arrest (DHCA) in canine models.


METHODS
Fifteen healthy adult dogs were randomly divided into 3 groups (n=5), namely the simple DHCA group (group I), DHCA+RCP group (group II) and DHCA+SACP group (group III). Extrocorporeal circulatory was established routinely in the dogs, and DHCA commenced when the nasopharyngeal temperature was reduced to 18 degrees C. During DHCA, RCP and SACP were applied in groups II and III, respectively. All the models were rewarmed after 90 min of DHCA and the cerebral reperfusion continued for 90 min. Cerebral oxygenous metabolic function, cerebral temperature and ultrastructural changes of the neurons were observed in the 3 groups at different time points during the operation.


RESULTS
The jugular venous oxygen saturation (SjvO(2)) increased with the temperature reduction, and then decreased after DHCA commencement, showing significant changes at different time points in groups I and II. SjvO(2) in group III were significantly higher than that in the other two groups after 90 min of DHCA (P=0.000). Brain temperature significantly increased in group I during DHCA as compared with that in groups II and III (P=0.000), but showed no significant difference between the latter two groups (P=0.195). The ultrastructure of the neurons underwent obvious changes after reperfusion for 30 min in group I. In group II the neuronal ultrastructure was basically normal at 60 min during DHCA and changed slightly at 90 min, but in group III no obvious changes were seen at 90 min during DHCA and only slight changes occurred at 30 min of reperfusion.


CONCLUSIONS
RCP can not supply enough oxygen but can maintain low cerebral temperature, and provide short-term brain protection. DHCA+SACP provides better brain protection than simple DHCA and DHCA+RCP, and has a promising prospect in cardiac surgery.
Gao
Yong
Y
Department of Thoracic and Cardiac Surgery, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China. gaogyong@126.com
Zou
Xiao-ming
XM
Wang
Wu-jun
WJ
Liu
Gao-wang
GW
Gu
Miao-ning
MN
D000818:Animals; D001785:Blood Gas Monitoring, Transcutaneous; D001921:Brain / Q000098:blood supply* / Q000378:metabolism / Q000648:ultrastructure; D050792:Circulatory Arrest, Deep Hypothermia Induced / Q000379:methods*; D004285:Dogs; D005112:Extracorporeal Circulation; D005260:Female; D008297:Male; D008854:Microscopy, Electron; D009474:Neurons / Q000378:metabolism / Q000648:ultrastructure; D010101:Oxygen Consumption; D010477:Perfusion / Q000379:methods*; D011897:Random Allocation; D051381:Rats