[Dynamic changes of blister fluid amikacin concentration after its early-stage administration in severely burned patients]

Author(s): Hua R, Rong XZ, Zhang T, Yang RH

Affiliation(s): Department of Burns, First People's Hospital of Guangzhou, Guangzhou Medical College, Guangzhou 510180, China. hzr19810915@ sohu.com

Publication date & source: 2007-10, Nan Fang Yi Ke Da Xue Xue Bao., 27(10):1522-3.

Publication type: English Abstract; Randomized Controlled Trial; Research Support, Non-U.S. Gov't

OBJECTIVE: To determine the adequate timing of antibiotics application in severely burned patients by observing the dynamic changes of amikacin in blister fluid during early postburn stage. METHODS: Twenty patients in early stage of sever burns were divided into 4 groups (n=5) according to the timing of amikacin administration, namely at 3-4 h (group A), 10 h (group B, 20 h (group C), and 30 h (group D) postburn. Amikacin was administered intravenously via a single dose of 400 mg within 30 min, and at the time points of 0.25 to 7 h after completion of the infusion, the blister fluid was collected from each patient for determination of amikacin concentration with fluorescence polarization immunoassay. RESULTS: Fifteen minutes after intravenous administration, amikacin could be detected in the blister fluid, reaching the highest level at 1-2 h after administration followed by gradual declination. In group B, blister fluid amikacin concentration reached 4.96+1.60 microg/ml 15 min after administration, and at the subsequent time points until 4 h, amikacin concentration was significantly higher in groups A and B than in groups C and D (P<0.05). Amikacin concentration in the blister fluid in group D was not sufficient for effective antibacterial therapy. CONCLUSION: Amikacin administration in the early postburn stage may ensure higher amikacin concentration in the blister fluid and wound exudate. Better antibacterial effect can be expected when amikacin is applied within the initial 10 h postburn.