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The aim of the study was to assess the effect of cardiothoracic surgery on the dynamics of plasminogen, D-dimers and plasminogen activator inhibitor (PAI-I) during the first 24h after surgery. The study included 14 patients operated with (on-pump) and 14 without (off-pump) the use of extracorporeal circulation (ECC). Blood sampling was carried out on induction of anesthesia (timepoint 1), on introduction of heparin (point 2) and protamine (point 3), at the end of surgery (point 4), and the next morning (point 5). Relative to point 1, the utilization of plasminogen at point 2 was 24% and 17% in the on-pump and off-pump groups, respectively (p=0.001 both). Increased D-dimer concentration from the baseline was more pronounced in the on-pump group (p=0.001). At point 5, D-dimer concentrations were comparable in both groups and different from baseline levels. PAI-I activity showed within-group differences from baseline at point 5 in the off-pump group (p=0.001), and at points 3 and 5 in the on-pump group (p=0.002 and 0.001, respectively). At point 5, the activity of PAI-I was comparable in both groups, yielding p=0.001 vs. baseline. Fibrinolysis was more pronounced and more dynamic in the on-pump group due to activation of the systemic inflammatory response induced by the use of ECC. In the off-pump group, fibrinolysis was a normal physiological response to the surgical procedure.

Monitoring of fibrinolysis parameters during myocardial revascularization according to type of procedure