Abstract：
PURPOSE:Optimal dosing of antibiotics is important for efficacy and avoidance of resistance. Fluoroquinolones are frequently used to treat severe infections in critically ill patients. We studied ciprofloxacin pharmacokinetics after administration of 400 mg twice a day (bid) intravenously (IV). MATERIAL AND METHODS:Serum concentrations were measured in 32 intensive care unit patients (age, 68.7 +/- 17.4 years; Sepsis-related Organ Failure Assessment (SOFA) scores, 7.3 +/- 3.4). Blood samples were drawn at 7 time points after ciprofloxacin infusion. We evaluated whether areas under the curve (AUCs) exceeded minimal inhibitory concentration (MIC) values of 0.125, 0.25, 0.5, 1.0, and 2.0 mg/L by 125 times and peak concentrations (C(max)) 10 x MIC (C(max)/MIC >10). RESULTS:The AUC/MIC more than 125 was achieved in 100% for MIC 0.125. For MIC values 0.25, 0.5, 1.0, and 2.0, results were 84%, 31%, 3%, and 0%, respectively (P < .01). The C(max)/MIC more than 10 for MIC values of 0.125, 0.25, 0.5, 1.0, and 2.0 was realized in 100%, 97%, 69%, 25%, and 0%, respectively (P < .01). Female sex, SOFA(pulmonary) points, and SOFA(renal) points predicted higher AUC. Cumulative SOFA scores were most predictive of high AUCs. CONCLUSIONS:Ciprofloxacin 400 mg bid IV leads to inadequate AUC/MIC and C(max)/MIC ratios in many cases. Effective killing concentrations were only achieved in pathogens with MIC less than 0.25. As bacteria in intensive care unit patients often exceed this threshold, we recommend to use higher doses of ciprofloxacin (1200 mg daily) to ensure optimal bacterial killing and avoid antibiotic resistance.
journal_name
J Crit Carejournal_title
Journal of critical careauthors
van Zanten AR,Polderman KH,van Geijlswijk IM,van der Meer GY,Schouten MA,Girbes ARdoi
10.1016/j.jcrc.2007.11.011subject
Has Abstractpub_date
2008-09-01 00:00:00pages
422-30issue
3eissn
0883-9441issn
1557-8615pii
S0883-9441(07)00203-1journal_volume
23pub_type
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