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• W1969762322 abstract "The prescription of pharmaceuticals in the critically ill is complicated by a paucity of knowledge concerning the pharmacokinetic implications of the underlying disease state. Changes in organ function can be dramatic in this population, both as a consequence of the primary pathophysiology and in response to clinical interventions provided. Vascular tone, fluid status, cardiac output and major organ blood flow can be significantly altered from baseline, influencing the volume of distribution and clearance of many commonly prescribed agents. Although measurable endpoints can be used to titrate doses for many drugs in this setting (such as sedatives), for those agents with silent pharmacodynamic indices, enhanced excretory organ function can result in unexpectedly low plasma concentrations, leading to treatment failure. This is particularly relevant to the use of antibacterials in the critically ill, where inadequate, inappropriate and/or delayed prescription can have significant effects on morbidity and mortality. Augmented renal clearance (ARC) refers to enhanced renal elimination of circulating solute and is being described with increasing regularity in the critically ill. However, defining this process in terms of current measures of renal function is problematic, as although the glomerular filtration rate (GFR) is largely considered the best index of renal function, there is no consensus on an upper limit of normal. In addition, the most readily available and accurate estimate of the GFR at the bedside is still widely debated. From a pharmacokinetic point of view, ARC can result in elevated renal elimination and subtherapeutic plasma concentrations of pharmaceuticals, although whether this process solely involves augmented filtration (as opposed to enhanced tubular secretion and/or reabsorption) remains uncertain. The primary contributors to this process are likely to be the innate immune response to infection and inflammation (with its associated systemic and haemodynamic consequences), fluid loading and use of vasoactive medications. The resultant increase in cardiac output and renal blood flow prompts enhanced glomerular filtration and drug elimination. Current evidence suggests that young patients without preexisting co-morbidity or organ dysfunction who present with trauma are most likely to manifest ARC. As this phenomenon has received little attention in the literature, dose modification has rarely been considered. However, with increasing data supporting the concept, and many investigators demonstrating subtherapeutic concentrations of drugs in the critically ill, consideration of ARC and alternative dosing regimens is now mandatory, both to improve the likelihood of treatment success and to reduce the rate of development of antibacterial resistance." @default.
• W1969762322 created "2016-06-24" @default.
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• W1969762322 date "2010-01-01" @default.
• W1969762322 modified "2023-10-11" @default.
• W1969762322 title "Augmented Renal Clearance" @default.
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