Effect of lidocaine on neutrophil chemotaxis in newborn infants.

Anesthetic drugs can influence the immune system, particularly granulocyte function. The goal of the present study was to evaluate if lidocaine used for epidural anesthesia during cesarean section can influence neonatal neutrophil chemotaxis. We measured chemotaxis and plasma cord lidocaine and cortisol levels in (A) 15 infants born by cesarean section with epidural anesthesia, (B) 15 infants born by vaginal delivery, and (C) 20 infants born by cesarean section with general anesthesia. Chemotaxis levels were significantly lower in group A infants (35.5 +/- 16.1 microns) compared to groups B (54.6 +/- 10.5 microns) and C (71.4 +/- 23 microns). The highest cortisol levels were observed in vaginally delivered infants. A significant inverse relationship was observed between chemotaxis and lidocaine levels (r = -0.6, P = 0.016) in infants born by cesarean section after epidural anesthesia, while no significant correlation was observed between chemotaxis and cortisol level. In conclusion, lidocaine, transferred through the placenta to the fetus during epidural anesthesia, may have an inhibitory effect on chemotaxis.