title: In vivo study of hot compressing molded 50:50 poly (DL-lactide-co-glycolide) antibiotic beads in rabbits.
abstract: The authors investigated poly (DL-lactide-co-glycolide) beads as an antibiotic delivery system in vivo for the treatment of various surgical infections. In this study, the copolymer 50:50 poly (DL-lactide):co-glycolide was mixed with vancomycin powder and hot compressing molded at 55 degrees C to form 8 mm in diameter biodegradable antibiotic beads. The antibiotic beads were implanted in the distal femoral cavities of rabbits for in vivo investigation. The local concentration of vancomycin was well above the breakpoint sensitivity concentration (the antibiotic concentration at the transition point between bacterial killing and resistance to the antibiotic) for 56 days. The release was most marked during the first day. The diameters of the sample inhibition zone ranged from 8 to 18 mm, and the relative activity of vancomycin ranged from 9.1% to 100%. Only low systemic blood levels of vancomycin were measured after beads implantation. There was no increase in the concentration of blood urea nitrogen and serum creatinine after the implantation. Histological observations showed that the bead materials were biodegradable, resorbed slowly, and did not cause a significant host reaction. This study offers a biodegradable delivery system of antibiotics to treat various surgical infections.
authors.affiliation: Department of Orthopaedic Surgery, Chang Gang Memorial Hospital, Keelung, Taiwan. wenneng@cgmh.org.tw
authors.forename: Steve W N
authors.initials: SW
authors.lastname: Ueng
authors.forename: Li-Jen
authors.initials: LJ
authors.lastname: Yuan
authors.forename: Ning
authors.initials: N
authors.lastname: Lee
authors.forename: Song-Shu
authors.initials: SS
authors.lastname: Lin
authors.forename: Shih-Jung
authors.initials: SJ
authors.lastname: Liu
authors.forename: Err-cheng
authors.initials: EC
authors.lastname: Chan
authors.forename: Jui-Hsun
authors.initials: JH
authors.lastname: Weng
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000008:administration & dosage*; D001419:Bacteria / Q000187:drug effects; D001806:Blood Urea Nitrogen; D016503:Drug Delivery Systems; D004343:Drug Implants; D008297:Male; D011098:Polyglactin 910 / Q000008:administration & dosage*; D011183:Postoperative Complications / Q000188:drug therapy; D011817:Rabbits; D014640:Vancomycin / Q000008:administration & dosage* / Q000493:pharmacokinetics
chemical_list: D000900:Anti-Bacterial Agents; D004343:Drug Implants; D011098:Polyglactin 910; D014640:Vancomycin