Principi di farmacocinetica e aggiustamento posologico dei farmaci nell terapie sostitutive renali continue (CRRT).

Translated title of the contribution: [Pharmacokinetic principles and drug-dosing adjustments during continuous renal replacement therapies (CRRT)].

S. Morabito, I. Guzzo, E. Vitaliano, L. Muzi, A. Solazzo, V. Pistolesi, A. Pierucci

Research output: Contribution to journalArticlepeer-review

Abstract

In the critically ill, acute renal failure (ARF) and "Multiple Organ Dysfunction Syndrome" (MODS) can be associated with significant modifications of many pharmacokinetic parameters, such as protein binding, volume of distribution and total body clearance. The start of renal replacement therapy (RRT) represents an additional variable to take in consideration for drug-dosing adjustments. Drugs significantly eliminated by the kidney are likely to be removed during RRT and a supplemental dose or further dosing adjustments are required if extracorporeal clearance is more than 25-30% of total body clearance. The impact of RRT on plasma drug concentrations can be substantially different in relation to the type of treatment (diffusive, convective or both), membrane characteristics (low-flux or high-flux), filter surface area and prescribed dialysis dose. The molecular weight cut-offs of high-flux membrane are much higher than the molecular weight of most drugs. Therefore, molecular size will not be a limitation for the removal of the unbound fraction of the drugs most commonly used in the critically ill undergoing continuous renal replacement therapy (CRRT). However, diffusive clearance could be significantly lower than convective clearance for drugs in the middle molecular weight range. In any case, the extracorporeal clearances report-ed with the use of high-volume CRRT (>50-60 L/2 h) are often surprisingly elevated and can lead to drug underdosing in clinical conditions where adequate antibiotic treatment is essential.

Translated title of the contribution[Pharmacokinetic principles and drug-dosing adjustments during continuous renal replacement therapies (CRRT)].
Original languageItalian
JournalGiornale italiano di nefrologia : organo ufficiale della Società italiana di nefrologia
Volume23 Suppl 36
Publication statusPublished - May 2006

ASJC Scopus subject areas

  • Nephrology

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