The desired target steady-state average colistin concentration (Css,avg) to balance between therapeutic effectiveness and nephrotoxicity is largely unclear. The objective of this study was to evaluate the effect of the desired target colistin Css,avg on the effectiveness and safety of IV colistin therapy in critically ill patients. Overall, 153 critically ill patients (71% males) receiving IV colistin were retrospectively analyzed. The desired target colistin Css,avg was estimated based on the daily colistin dose and creatinine clearance of each patient. No significant predictor for clinical cure was identified. However, microbiological outcome was significantly associated with pneumonia compared to bacteremia (odds ratio [OR] 0.092, 95% confidence interval [CI] [0.033–0.251], P < 0.001) and the use of IV colistin loading dose (OR 2.783, 95% CI [1.126–6.880], P = 0.027). Colistin-associated nephrotoxicity was significantly less likely to occur in patients who received inhaled colistin close to the time of IV colistin therapy (OR 0.331, CI [0.119–0.925], P = 0.035). The desired target Css,avg of colistin was not associated with treatment outcomes or the risk of nephrotoxicity. Loading dose and inhaled colistin use near the time of IV colistin therapy may be considered to maximize therapeutic effectiveness and minimize the risk of colistin-associated nephrotoxicity, respectively.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Education (2017R1D1A1B03033389). E. K. Chung received research grant support from the NRF funded by the Korea government (Ministry of Science and ICT; MSIT) (2017R1C1B5015865). The funder had no involvement in the study design; data collection, analysis, and interpretation; manuscript writing; and manuscript submission for publication.
© 2019, The Author(s).