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Related Concept Videos

Renal Drug Excretion: Glomerular Filtration01:02

Renal Drug Excretion: Glomerular Filtration

116
The kidney serves as the primary organ responsible for eliminating drugs and their metabolites from the body. This process, known as renal elimination, starts with glomerular filtration and results in urine formation. Each kidney houses millions of functional units called nephrons, where urine production occurs. A nephron has two main components: a renal corpuscle and a renal tubule.
Drugs gain access to the kidney via the renal artery, which progressively branches off into afferent arterioles....
116
Renal Clearance01:23

Renal Clearance

618
The glomerular filtration rate (GFR) is a critical marker of kidney function, reflecting the efficiency of filtration by the glomeruli. Renal clearance of specific substances, such as inulin or creatinine, is commonly used to measure GFR.
Renal clearance refers to the volume of plasma cleared of a specific substance, such as creatinine, per unit of time. To measure clearance, urine samples are collected over a 24-hour period during each bladder voiding, followed by a single blood sample at the...
618
Renal Drug Clearance: Comparison Between Renal Excretion Methods01:08

Renal Drug Clearance: Comparison Between Renal Excretion Methods

55
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.
Renal clearance is often associated with the renal glomerular filtration rate (GFR), which represents the rate at which plasma is filtered through the glomeruli in the kidney. When drug reabsorption is minimal and there is no active secretion, renal clearance is closely related to the...
55
Factors Affecting Renal Clearance: Renal Impairment01:17

Factors Affecting Renal Clearance: Renal Impairment

46
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...
46
One-Compartment Open Model: Urinary Excretion Data and Determination of k01:11

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

115
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...
115
Glomerular Filtration Rate and its Regulation01:28

Glomerular Filtration Rate and its Regulation

2.1K
The Glomerular Filtration Rate (GFR) is a measure of kidney function, reflecting the volume of filtrate formed per minute in the kidneys. On average, GFR is approximately 125 mL/min in males and 105 mL/min in females. Maintaining a relatively constant GFR is essential for the kidneys to effectively regulate body fluid homeostasis and maintain extracellular stability.
GFR regulation involves two primary intrinsic controls: the myogenic and tubuloglomerular feedback mechanisms.
The myogenic...
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Updated: May 22, 2025

A High-throughput Method for Measurement of Glomerular Filtration Rate in Conscious Mice
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Is Iohexol a Possible Method for Estimating Glomerular Filtration Rate?

Fabrizio Cristiano1, Guillermo Rosa-Diez2, Carlos Guido Musso2

  • 1UOSD Nefrologia e Dialisi Ospedale di Ortona, Asl 2 Lanciano Vasto Chieti.

Giornale Italiano Di Nefrologia : Organo Ufficiale Della Societa Italiana Di Nefrologia
|May 7, 2025
PubMed
Summary
This summary is machine-generated.

The iohexol clearance test offers a precise method for measuring kidney function, crucial for managing chronic kidney disease (CKD) and autosomal dominant polycystic kidney disease (ADPKD). This advanced technique provides reliable glomerular filtration rate (GFR) estimates, improving patient care.

Keywords:
CKDglomerular filtration rateiohexol

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Area of Science:

  • Nephrology
  • Diagnostic Imaging
  • Pharmacokinetics

Background:

  • Glomerular filtration rate (GFR) measurement is vital for diagnosing and managing chronic kidney disease (CKD) and autosomal dominant polycystic kidney disease (ADPKD).
  • Traditional GFR estimation methods using creatinine or cystatin C can be unreliable due to physiological variations like muscle mass and diet.
  • Existing methods like inulin or radioactive tracers have limitations, necessitating more accurate and less invasive alternatives.

Purpose of the Study:

  • To describe the procedures for iohexol clearance testing for direct GFR estimation.
  • To highlight the accuracy and utility of iohexol clearance in monitoring kidney disease progression, particularly in CKD and ADPKD.
  • To evaluate iohexol clearance as a superior alternative to traditional GFR markers.

Main Methods:

  • Intravenous administration of iohexol, a non-ionic contrast agent exclusively cleared by glomerular filtration.
  • Collection of blood samples at defined intervals post-administration to analyze iohexol elimination kinetics.
  • Adjusting sampling intervals based on patient's renal function: more frequent for normal function, wider for advanced CKD and ADPKD.

Main Results:

  • Iohexol clearance demonstrated high precision and reproducibility compared to other GFR markers.
  • The method effectively monitors the progression of CKD and ADPKD, detecting subtle GFR changes even in early disease stages.
  • Iohexol is particularly valuable for evaluating therapeutic interventions in ADPKD by providing reliable GFR estimates.

Conclusions:

  • Iohexol clearance is a highly accurate and reproducible method for GFR estimation, offering significant advantages over traditional markers.
  • Its application in monitoring CKD and ADPKD progression, especially for evaluating targeted therapies, enhances nephrology practice.
  • Despite limitations such as cost and protocol strictness, iohexol clearance is implemented in advanced healthcare settings, confirming its clinical utility.