Introduction: In coronary bypass surgery, after cardiopulmonary bypass is initiated by
arterial cannulation in the ascending aorta and venous cannulation through a single vein generally in
the right atrium, the process of cooling the patient is started.
Objective: There is a relation between cooling the patient and irisin, which is responsible for releasing
heat. Therefore, the main objective of the present study is to explore how irisin concentrations
and some other panel of myocardium injury in patients undergoing coronary artery bypass surgery.
Methods: The blood samples collected before induction (T1), before bypass (T2), before (T3) and
after (T4) removing the cross-clamp, upon admission to intensive care (T5), and at the postoperative
24 (T6) and 72 (T7) hours, and whether these concentrations are correlated with lactate
levels classically used in monitoring this surgery. A total of biological samples, 23 from control
individuals and 105 from bypass patients (14-16 samples for each timeframe) were analyzed to
determine irisin, CK-MB, TnT and BNP levels by ELISA and lactate levels by lactate assay kit.
Both lactate and irisin were seen to increase gradually from the time of induction to the removal of
the cross-clamp. After the cross-clamp was removed and the patient was started to be warmed, both
parameters began to decrease gradually and were restored to normal levels on the second and third
post-operative days. The increase and decrease in irisin were found correlated with lactate levels.
CK-MB, TnT and BNP alteration were similar to each other.
Results: Based on these results, it is estimated that measurement of irisin along with lactate may
prove to be a useful parameter in monitoring the coronary bypass surgery and irisin may be a significant
marker of hypothermia. Beside CK-MB, TnT and BNP, measurements of irisin concentration
in open heart surgery may also be useful parameters for the panel of myocardium injury.