Cytokine responses to myocardial revascularization on cardiopulmonary bypass: intermittent crossclamping versus blood cardioplegic arrest.
BACKGROUND
The inflammatory responses to the different myocardial protection approaches have not been thoroughly investigated. We sought to study the cytokine responses to cardiopulmonary bypass (CPB) using the intermittent aortic crossclamping with ventricular fibrillation (IAC) versus blood cardioplegic arrest (BC) techniques.


METHODS
Perioperative plasma levels of tumor necrosis factor a (TNF-alpha), interleukins (IL) 6, 8, 10, and cardiac troponin-I (cTnI) were measured serially before surgery, at the end of surgery, and 2, 24, and 48 hours after elective coronary revascularization in 31 patients (IAC: n=15; BC: n=16).


RESULTS
Demographics, preoperative status, and number of grafts (IAC: 2.7 +/- 0.6; BC: 3.0 +/- 0.4) were similar between groups. No major complications occurred in either group. The total ischemic time and duration of CPB were shorter in group IAC (17 +/- 5 and 58 +/- 10 min vs 45 +/- 14 and 81 +/- 21 min; both p<0.01). Although the intergroup difference in postoperative cTnI levels was not statistically significant, the release of both TNF-alpha and IL-8 were higher in group IAC than in group BC. However, IL-6 and IL-10 levels were lower after surgery in group IAC.


CONCLUSIONS
Despite the duration of ischemia and CPB being shorter, intermittent aortic crossclamping is associated with an enhanced pro-inflammatory but a reduced anti-inflammatory response compared to the cardioplegic arrest technique. Its clinical relevance needs to be further defined.
Wan
Song
S
Division of Cardiothoracic Surgery, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong, People's Republic of China.
Arifi
Ahmed A
AA
Wan
Innes Y P
IY
Ng
Calvin S H
CS
Lee
Tak Wai
TW
Yim
Anthony P C
AP
D000368:Aged; D002315:Cardiopulmonary Bypass / Q000009:adverse effects / Q000379:methods*; D003250:Constriction; D001026:Coronary Artery Bypass / Q000379:methods*; D016207:Cytokines / Q000097:blood*; D005260:Female; D006324:Heart Arrest, Induced; D006801:Humans; D008297:Male; D008875:Middle Aged; D017202:Myocardial Ischemia / Q000601:surgery; D015428:Myocardial Reperfusion Injury / Q000097:blood* / Q000209:etiology; D011446:Prospective Studies; D019210:Troponin I / Q000097:blood*
D016207:Cytokines; D019210:Troponin I