Clinical efficacy of heparin-bonded bypass circuits related to cytokine responses in children

Background. Cardiopulmonary bypass (CPB) induces numerous systemic reactions. This study examined the efficacy of heparin-bonded CPB circuits on inflammatory responses and postoperative status in children. Methods. Thirty-four infants undergoing elective cardiac surgery were randomly divided into two groups: a heparin-bonded CPB group (n = 17) and a non-heparin-bonded group (n = 17). Plasma levels of the inflammatory cytokines were measured before, during, and after CPB, and postoperative status was determined by examining the respiratory index, blood loss, and the post- and preoperative body weight percent ratio. Results. Significant differences in tumor necrosis factor-α, interleukin-6, and interleukin-8 patterns were observed during and after CPB between the two groups (p< 0.01, p< 0.01, p< 0.05, respectively). All cytokines measured were significantly lower in the heparin-bonded group just after CPB (p< 0.05). There were no differences in duration of intubation, intensive care unit or hospital stay, or postoperative blood loss, but the respiratory index 3 hours after CPB and body weight percent ratio 24 and 48 hours after CPB were significantly reduced in the bonded group (p< 0.05, p< 0.01, p< 0.05, respectively). Conclusions. Our findings suggest that heparin bonding of the bypass circuits affects early postoperative status and reduces cytokine responses in pediatric cardiac surgery.