Leukocyte filtration improves pulmonary function and reduces the need for postoperative non-invasive ventilation

OBJECTIVES: Leukocyte depletion (LD) has been reported to reduce inflammatory damage during cardiopulmonary bypass (CPB). We evaluated the role of LD in pulmonary function and inflammatory response. METHODS: Seventy consecutive CABG patients were randomized (1:1) to receive LD on both arterial and cardioplegia lines (Filters) or standard arterial filters (Controls) during CPB. Estimates of pulmonary function, inflammatory and anti-inflammatory cytokines were collected pre-, intra- and postoperatively. RESULTS: Hospital mortality, intensive care and in-hospital lengths of stay were similar. Although duration of ventilation and incidence of pneumonia were comparable, leukodepleted patients showed higher PaO2/FiO2 (p-between groups = 0.005; ICU arrival p = 0.023; 24 hours p = 0.039; 48 hours p<0.001) and lower need for postoperative non-invasive ventilation (NIV), (p = 0.029). Moreover, Filters showed lower inflammatory burst at 24 hours (IL-6 p<0.001; IL-8 p = 0.002) and 48 hours (IL-6 p = 0.015). This was associated with a lower release of the anti-inflammatory IL-10 (p-between groups = 0.030; ICU admission p = 0.002; 24 hours p = 0.003). Furthermore, IL-2 concentration proved higher in Filters (p-between groups = 0.013; ICU arrival p = 0.029; 24 hours p = 0.040; 48 hours p = 0.021) in association with lower leukocyte and platelet counts at ICU admission. CONCLUSIONS: LD resulted in lower inflammatory burst and less need for release of anti-inflammatory cytokines. Although hospital outcomes were similar in terms of mortality and length of stay, improvements in pulmonary function and reduced need for postoperative NIV support the use of LD.