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Related Concept Videos

Drug Dosing in Renal Diseases: Measurement of Serum Creatinine Concentration and Clearance01:25

Drug Dosing in Renal Diseases: Measurement of Serum Creatinine Concentration and Clearance

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In healthy individuals, serum creatinine levels remain stable due to a balance between its constant production—primarily from muscle metabolism—and renal excretion. Creatinine is freely filtered by the glomeruli, making it a valuable marker for estimating renal function. When the glomerular filtration rate (GFR) decreases, the kidneys can only eliminate less creatinine, causing serum levels to rise.Serum creatinine concentration is widely used to estimate creatinine clearance...
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Drug Dosing in Renal Diseases: Estimation of Glomerular Filtration Rate Based on Serum Creatinine Concentration01:28

Drug Dosing in Renal Diseases: Estimation of Glomerular Filtration Rate Based on Serum Creatinine Concentration

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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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Factors Affecting Renal Clearance: Renal Impairment01:17

Factors Affecting Renal Clearance: Renal Impairment

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Renal dysfunction significantly impairs the renal clearance of drugs, leading to potential complications in drug therapy. Renal failure, which can be caused by various factors, poses a significant challenge in the elimination of drugs from the body.
One condition associated with renal failure is uremia. Uremia is characterized by impaired glomerular filtration and fluid accumulation in the body. This condition hinders the renal clearance of drugs, resulting in drug accumulation and potential...
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Renal Drug Clearance: Comparison Between Renal Excretion Methods01:08

Renal Drug Clearance: Comparison Between Renal Excretion Methods

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Renal clearance is a critical parameter encompassing kidney filtration, secretion, and reabsorption processes. It is calculated using a specific equation to determine the rate at which the kidneys clear a drug.
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Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion01:18

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In geriatric patients, renal physiology undergoes significant changes, including diminished renal blood flow and a lower glomerular filtration rate (GFR), leading to alterations in medication clearance. Drugs such as aminoglycoside antibiotics, lithium, and digoxin, which rely on glomerular filtration for removal from the body, particularly impact pharmacokinetics. These drugs tend to have slower clearance rates in older adults, necessitating careful dosage considerations.Evaluation of renal...
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Determination of Renal Drug Clearance: Graphical and Midpoint Methods01:07

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Renal clearance, a crucial parameter in pharmacokinetics, can be determined using two different methods: the graphical method and the midpoint method. These methods provide insights into the rate of drug excretion by the kidneys and aid in assessing renal function.
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A High-throughput Method for Measurement of Glomerular Filtration Rate in Conscious Mice
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A retrospective study comparing creatinine clearance estimation using different equations on a population-based

Abigail Ferreira1,2, Rui Lapa2, Nuno Vale1,3

  • 1OncoPharma Research Group, Center for Health Technology and Services Research (CINTESIS), Rua Dr. Plácido da Costa, Porto 4200-450, Portugal.

Mathematical Biosciences and Engineering : MBE
|September 14, 2021
PubMed
Summary

Estimating renal function using creatinine clearance (CLCr) equations shows variability, especially in certain patient groups. The Cockcroft-Gault equation with lean body weight often yields lower CLCr estimates.

Keywords:
Cockcroft-Gault formulaCorcoran-Salazar formulaJelliffe formulaWright formulaantibioticscreatinine clearance estimationrenal functiontherapeutic drug monitoring (TDM)

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Area of Science:

  • Pharmacokinetics and Drug Metabolism
  • Nephrology and Renal Function Assessment

Background:

  • Renal elimination is crucial for drug excretion, but medications can impair renal function.
  • Accurate assessment of renal function is vital for adjusting therapeutic regimens based on renal clearance.
  • Serum creatinine concentration is a common, though indirect, indicator of renal clearance, as glomerular filtration rate (GFR) is difficult to measure directly.

Purpose of the Study:

  • To investigate the differences between various creatinine clearance (CLCr) estimation equations.
  • To evaluate the influence of patient characteristics such as sex, age, and body composition on CLCr estimations.
  • To identify specific patient subgroups where CLCr estimation methods exhibit greater variability.

Main Methods:

  • Analysis of data from 82 inpatients undergoing antibiotic therapy.
  • Estimation of creatinine clearance (CLCr) using 12 different established equations.
  • Stratification of patients based on sex, age, and body composition (including body mass index and serum creatinine levels).

Main Results:

  • Significant variability was observed between different CLCr estimation methods.
  • Increased variability was noted in patients aged 51-60 years, those with normal body mass index, and individuals with below-normal serum creatinine levels.
  • The Cockcroft-Gault equation, when using lean body weight, consistently produced lower CLCr estimates across most patient groups.

Conclusions:

  • The choice of creatinine clearance (CLCr) equation can significantly impact the estimation of renal function.
  • Patient characteristics, particularly age, body composition, and baseline serum creatinine, influence the reliability of CLCr estimations.
  • The Cockcroft-Gault equation with lean body weight may underestimate renal function compared to other methods, warranting careful consideration in clinical practice.