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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

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. This equation is...
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Drug Dosing in Renal Diseases: Measurement of Glomerular Filtration Rate

The glomerular filtration rate (GFR) is a critical indicator of kidney health, reflecting how well the kidneys filter blood. Changes in GFR can signal potential kidney impairment, necessitating accurate measurement methods to monitor kidney function effectively.Various molecules can serve as markers for GFR measurement, with the ideal marker meeting several specific criteria. It must freely filter at the glomerulus, avoid reabsorption or secretion by the renal tubules, remain unmetabolized, not...
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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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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 (Clcr), a...
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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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Renal clearance is a crucial parameter in pharmacokinetics that quantifies the rate at which the kidneys excrete a drug. It represents a constant fraction of the central volume of distribution containing the drug that the kidney eliminates per unit of time.
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Estimating relative renal function from relative parenchymal volume--a feasibility study.

Guy Hidas1, Jacob Sosna, Victor Neeman

  • 1Department of Urology, Hebrew University Medical Center Jerusalem, Israel. guy@hidas.nete

Journal of Endourology
|December 3, 2008
PubMed
Summary

Non-enhanced CT scans can accurately estimate relative kidney function by measuring kidney parenchymal volume. This method offers a feasible alternative for urological decision-making, correlating well with traditional scintigraphy.

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Area of Science:

  • Urology
  • Radiology
  • Nephrology

Background:

  • Relative kidney function is crucial for urological decision-making.
  • Accurate assessment of kidney function aids in treatment planning and monitoring.

Purpose of the Study:

  • To assess the feasibility of estimating relative kidney function using relative kidney parenchymal volume derived from non-enhanced CT scans.
  • To compare CT-derived kidney volume measurements with scintigraphy-based function assessments.

Main Methods:

  • Twenty-seven patients underwent both non-enhanced CT and renal scintigraphy.
  • Kidney volumes were calculated from CT images by manually outlining regions of interest.
  • Relative kidney volume was determined as the ratio of individual to total kidney volumes.

Main Results:

  • A strong correlation (r = 0.92) was observed between relative kidney volume (CT) and relative kidney function (scintigraphy).
  • The correlation remained consistent across a wide range of kidney functions (15% to 87%).
  • The mean difference between CT and scintigraphy ratios was 5.7%, with 89% of patients showing less than a 10% difference.

Conclusions:

  • Non-enhanced CT-derived relative kidney parenchymal volume provides a close estimate of relative kidney function.
  • This CT-based method shows promise as a feasible tool in urological practice.
  • Further studies with larger cohorts are warranted, especially including cases of acute kidney function changes.