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Related Concept Videos

Drug Dosing in Renal Diseases: Dose Adjustments Based on Drug Clearance and Elimination Rate Constant01:25

Drug Dosing in Renal Diseases: Dose Adjustments Based on Drug Clearance and Elimination Rate Constant

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In patients with renal disease, dosage adjustments are necessary to maintain therapeutic plasma drug concentrations and prevent toxicity or subtherapeutic exposure. Renal impairment alters drug pharmacokinetics, especially in conditions like uremia, where changes such as prolonged elimination half-life and altered apparent volume of distribution can significantly affect drug disposition. These changes require careful modification of the dosing regimen to achieve the desired clinical...
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Continuous Renal Replacement Therapy01:30

Continuous Renal Replacement Therapy

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Continuous Renal Replacement Therapy, also known as CRRT, is a procedural treatment for acute kidney injury (AKI) that gradually removes uremic toxins and fluids while maintaining acid-base balance and stabilizing electrolytes. It is particularly useful for hemodynamically unstable patients. Unlike intermittent hemodialysis, which is faster, CRRT provides a gentler approach over 24 hours, closely mimicking the function of natural kidneys. However, CRRT is not ideal for patients with...
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Renal Failure: Dose Adjustments01:11

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In patients with renal impairment, drugs undergo significant changes in their pharmacokinetics, which require dosage adjustments to ensure safe and effective therapy.
Reduced renal clearance and elimination rate are common outcomes of renal impairment. These alterations lead to a prolonged elimination half-life and an altered apparent volume of distribution for drugs. As a result, dosage adjustments are typically necessary to maintain optimal drug levels in the body.
However, dosage adjustments...
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Extracorporeal Removal of Drugs: Continuous Renal Replacement Therapy01:26

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Continuous Renal Replacement Therapy (CRRT) is an essential intervention for patients experiencing severe kidney dysfunction. This therapy offers a continuous mechanism for removing fluids and toxins from the bloodstream, leveraging the patient’s blood pressure to facilitate filtration through a specialized filter. This method contrasts with intermittent dialysis, providing a gentler and more consistent removal of waste products and excess fluid, which is particularly beneficial in...
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Drug Accumulation During Multiple Dosing: Intermittent IV Infusions01:24

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Intermittent intravenous (IV) infusion is a method of drug administration where medications are delivered over short infusion periods followed by intervals of no drug delivery. This approach helps to prevent sustained high drug concentrations in the bloodstream, reducing the risk of adverse effects associated with prolonged exposure. Unlike continuous infusion, steady-state concentrations may not be achieved during a single dosing cycle but can be reached through repeated...
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Drug Dosing in Renal Diseases: Estimation of Glomerular Filtration Rate Based on Serum Creatinine Concentration01:28

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Glomerular filtration rate (GFR) can be estimated from serum creatinine using the modification of diet in renal disease (MDRD) formula or the chronic kidney disease–epidemiology collaboration (CKD–EPI) equation. Both methods are widely used in clinical practice to assess kidney function and guide treatment decisions.The MDRD equation does not require weight or height measurements and is normalized to the body surface area of 1.73 m², considered the average adult surface area.
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Drug dosing considerations in continuous renal replacement therapy.

Soo Min Jang1, Linda Awdishu2

  • 1Department of Pharmacy Practice, Loma Linda University School of Pharmacy, Loma Linda, CA, USA.

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Summary

Treating sepsis in critically ill patients with acute kidney injury (AKI) and receiving continuous renal replacement therapy (RRT) requires careful antibiotic dosing. This review examines pharmacokinetic changes and dosing strategies to optimize antimicrobial therapy in these complex patients.

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Area of Science:

  • Critical Care Medicine
  • Pharmacology
  • Nephrology

Background:

  • Acute kidney injury (AKI) is prevalent in critically ill patients, increasing mortality.
  • Sepsis management with continuous renal replacement therapy (RRT) presents unique antibiotic dosing challenges.
  • Altered drug pharmacokinetics in AKI and RRT impact antibiotic efficacy.

Purpose of the Study:

  • To review pharmacokinetic alterations in patients with AKI undergoing RRT.
  • To discuss antibiotic dosing considerations for achieving therapeutic targets.
  • To highlight the need for enhanced drug monitoring in this population.

Main Methods:

  • Literature review focusing on drug pharmacokinetics in AKI and RRT.
  • Analysis of factors influencing drug absorption, distribution, metabolism, and elimination.
  • Examination of RRT's impact on drug removal.

Main Results:

  • Significant pharmacokinetic variability observed in patients receiving RRT.
  • Factors like protein binding and volume of distribution affect drug clearance.
  • Current therapeutic drug monitoring shows wide antimicrobial concentration ranges.

Conclusions:

  • Optimizing antibiotic dosing in AKI patients on RRT is crucial for effective sepsis treatment.
  • Understanding pharmacokinetic changes is essential for individualized dosing strategies.
  • Expanded drug monitoring is necessary to ensure therapeutic success and patient safety.