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Related Concept Videos

Drug Dosing in Renal Diseases: Measurement of Glomerular Filtration Rate01:25

Drug Dosing in Renal Diseases: Measurement of Glomerular Filtration Rate

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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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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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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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One-Compartment Open Model: Urinary Excretion Data and Determination of k01:11

One-Compartment Open Model: Urinary Excretion Data and Determination of k

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The one-compartment open model leverages urinary excretion data to estimate renal clearance, which gauges the kidney's capacity to expel a drug. This method offers several benefits, including directly measuring drug elimination and assessing the kidney's contribution to overall drug clearance. However, this approach has limitations. It assumes sole renal excretion of the drug, which is not true for all drugs. Accurate urinary excretion and plasma drug concentration measurement can also...
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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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Renal Drug Excretion: Effect of Urine pH, Flow Rate, and Drug pKa01:22

Renal Drug Excretion: Effect of Urine pH, Flow Rate, and Drug pKa

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The pH of urine, the drug's pKa, and the urine flow rate are vital parameters for drug reabsorption and excretion. Urinary pH varies between 4.6 and 8.0 and is influenced by diet, drug intake, and the patient's pathophysiology. It affects a drug's ionization state and reabsorption. For instance, carbohydrate-rich food produces alkaline urine promoting drug excretion, while proteins and certain medications like ascorbic acid lead to acidic urine enhancing reabsorption.
The pKa of a...
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Related Experiment Video

Updated: Mar 8, 2026

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Reconciliation between urea kinetics and direct dialysis quantification.

F G Casino1, V Gaudiano, G Santarsia

  • 1Divisione di Nefrologia e Dialisi, Ospedale Civile, Matera, Italy.

Nephrology, Dialysis, Transplantation : Official Publication of the European Dialysis and Transplant Association - European Renal Association
|January 1, 1992
PubMed
Summary
This summary is machine-generated.

Direct dialysate quantification (DDQ) and urea kinetic modeling (UKM) yield similar results when accurate dialyzer urea clearance and plasma water urea concentration are used. Paired filtration dialysis (PFD) is effective for studying dialysis solute kinetics.

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Area of Science:

  • Nephrology
  • Biomedical Engineering
  • Clinical Chemistry

Background:

  • Previous comparisons of urea kinetic modeling (UKM) and direct dialysate quantification (DDQ) reported statistically different results for urea distribution volume (V) and protein catabolic rate (PCR).
  • These discrepancies may stem from the use of inaccurate dialyzer urea clearance (K) and urea concentration (C) values in prior studies.

Purpose of the Study:

  • To compare UKM and DDQ using a variable-volume single-pool (VVSP) model.
  • To utilize accurate plasma water urea concentration (C) and effective dialyzer urea clearance (K) in both methods.
  • To evaluate the utility of paired filtration dialysis (PFD) for bloodless K measurement.

Main Methods:

  • The study involved 20 dialysis patients undergoing a single PFD session.
  • Dialysate and ultrafiltrate urea concentration and mass transfer were measured every 15 minutes.
  • Blood samples were collected for a three-point UKM, and an iterative technique was applied to both UKM and DDQ.

Main Results:

  • UKM yielded K = 176 ± 23 ml/min, V = 29986 ± 7620 ml, PCR = 65 ± 15 g/day, and Kt/V = 1.04 ± 0.17.
  • Results from UKM were not statistically different from those obtained using DDQ.
  • PFD facilitated accurate, bloodless measurement of K.

Conclusions:

  • When methodological errors are minimized, DDQ and UKM provide comparable results in assessing dialysis adequacy.
  • PFD is a valuable technique for studying solute kinetics during dialysis, enabling accurate K determination without repeated blood draws.