MYOCARDIAL PROTECTION WITH AND WITHOUT LEUKOCYTE DEPLETION - A COMPARATIVE-STUDY ON THE OXIDATIVE STRESS

We tested the hypothesis that controlled reperfusion with leukocyte-de pleted blood could improve myocardial protection by reducing the oxida tive stress in patients undergoing myocardial revascularization, Thirt y-four patients receiving antegrade/retrograde blood cardioplegia were divided into: group A: 11 patients with ejection fractions (EF) less than 35%, treated with leukocyte-depleted controlled blood reperfusion , group B: 11 patients with EF less than 35% in whom no leukocyte depl etion was performed, group C: 6 patients with EF more than 35% treated as group A and group D: 6 patients with EF more than 45% without leuk ocyte depletion, To asses the oxidative stress, we evaluated total, to tal oxidized (GSSX), and reduced glutathione (GSH) in coronary sinus p lasma, immediately before cross-clamping the aorta (TO), and at O (T1) , 15 (T2) and 30 (T3) min after unclamping it, In groups A and B a sig nificant shift towards oxidation of redox status of glutathione (GSH/G SSX) at T1 vs TO was observed, Glutathione redox ratio remained low in group B while in group A it returned to the basal value at T2 with a significant difference from group B at T2 and T3, No differences were observed between groups C and D, In conclusion, our data show that leu kocyte-depleted reperfusion can afford a better myocardial protection in patients with left ventricular dysfunction, while it seems unnecess ary in patients with normal EF.