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Ann Thorac Surg 1984;37:229-232
© 1984 The Society of Thoracic Surgeons

Articles

Complement (C3, C4) Consumption in Cardiopulmonary Bypass, Cardioplegia, and Protamine Administration

Ray Chu-Jeng Chiu, M.D., Ph.D.*, Roger Samson, C.P.

From the Division of Cardiovascular and Thoracic Surgery, McGill University and The Montreal General Hospital, Montreal, PQ, Canada

Accepted for publication March 24, 1983.

* Address reprint requests to Dr. Chiu, The Montreal General Hospital, 1650 Cedar Ave, Montreal, PQ, Canada H3G 1A4

Anaphylatoxins produced by complement activation have been postulated to be responsible for postperfusion syndrome and protamine hypotension in patients undergoing cardiac surgical procedures. The consumption of serum complement components C3 and C4, which reflects the classic and alternate pathway activations of the complement system, was studied in 22 patients undergoing cardiac operations. Prior to the onset of cardiopulmonary bypass, the complement levels were within normal range. Rapid reduction in both C3 and C4 within minutes of cardiopulmonary bypass indicated rapid complement activation. Such a reduction in complement levels could not be accounted for by either hemodilution or transfusion of complement-poor blood. Aortic cross-clamping and cold potassium cardioplegia followed by myocardial reperfusion did not lead to further consumption of C3 and C4. Slow intravenous infusion of protamine sulfate after cardiopulmonary bypass did not change C3 and C4 levels significantly in our patients, although protamine and heparin-protamine complex have been shown to activate complement components in vitro.

In another group of 9 similar cardiac surgical patients, C3 and C4 were found to return to normal levels within 24 hours after operation. This study thus confirms the rapid activation of the complement system by cardiopulmonary bypass but fails to demonstrate further activation of the complement system by cardioplegia or protamine administration.




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