SERUM CEFAZOLIN LEVELS DURING SPINAL-FUSION - EFFECT OF BLOOD-LOSS AND DURATION OF SURGERY

Perioperative cefazolin prophylaxis is commonly employed in posterior spinal fusion (PSF) procedures, which are often lengthy and involve si gnificant blood loss. In this study, serum levels of prophylactically administered cefazolin were measured serially during spinal fusion pro cedures, and the possible relationship of antibiotic concentrations to blood loss and fluid therapy were examined. Serum antibiotic levels, measured at 30-min intervals, declined with a half-life of 90 min, sim ilar to the previously reported experience with normal adult volunteer s. There was no relationship between serum half-life and blood loss or fluid replacement. An explanation for these findings is offered, alon g with recommendations for dosing.