Dose of colistin: a work in progress?
© Rocco et al.; licensee BioMed Central. 2015
Published: 16 February 2015
The Letter to this article has been published in Critical Care 2015 19:235
We thank Rashid and colleagues  and Honoré and colleagues  for their comments regarding our article on risk factors for acute kidney injury in patients receiving colistin or other nephrotoxic antimicrobials .
It is correct that we did not specifically report urine output in the text, but it was obviously included in the RIFLE (Risk, Injury, Failure, Loss of kidney function, and End-stage kidney disease) criteria reported in Table two .
We agree that the colistin methanesulfonate pharmacokinetics have been better studied recently, and it has become clear that high doses are required for treating multidrug-resistant Gram-negative bacilli infection, including the loading dose (which has changed from 4 to 9 million IU) and the dose interval (which has changed from three to two times a day) . We agree with the authors’ concerns about the adequacy of colistin dosages adopted in our cohort (130,000 IU/kg of ideal body weight, modified according to renal function), but these doses were commonly adopted, especially in patients with renal impairment . Indeed, the development of new high-performance liquid chromatography assays that allow clinicians to measure the concentrations of colistimethate and colistin separately has shown that colistin clearance is due mainly to non-renal mechanisms that are still unclear. It is of great interest to note, as reported recently by Honoré and colleagues , that patients with multidrug-resistant infections can receive even higher doses of colistin during continuous renal replacement therapy, as colistin methanesulfonate is continuously filtered and absorbed by dialysis membrane . Hence, even higher doses may be needed in patients receiving continuous renal replacement therapy than in patients with normal renal function. The growing evidence in favor of a higher dosage of colistin requires further clinical studies.
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